Sealed Cartridge Bottom Bracket Disassembly/Assembly

How to overhaul/service a Shimano sealed cartridge bottom bracket. I take it apart, clean, lube, replace the ball bearings and re-assemble it. This unit is a Shimano BB-TY30. But I think many, if not most Shimano sealed cartridge bottom brackets are built in the same way. The socket I use is a 13/16 inch deep 6pt socket. It is basically a spark plug socket. A 21mm 6pt socket will probably also work. There were twelve 7/32" ball bearings and eighteen 5/32" ball bearings. I used marine grease.
Here is a video rebuilding a bottom bracket with sealed cartridge bearings:
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[@RJTheBikeGuy]

For more bike repair videos hit the subscribe button 🛑 and click the notification bell ► bit.ly/SubRJTheBikeGuy

[@angelaison8224]

Hey RJ the bike guy.. Can you make a video servicing a Octalink bottom bracket.. ???

[@angelaison8224]

Hey RJ the bike guy.. Can you make a video servicing a Octalink bottom bracket.. ???

[@RJTheBikeGuy]

@@angelaison8224 Generally cartidge BBs are just replaced. I did this video showing it's possible to take them apart and overhaul them. I don't plant to make a video of every model of BB.

[@mikeforrest7478]

For a non-serviceable part it looked very serviceable. thanks.

[@boracay12]

Hmm . Sealed bottom bracket sounds good .but loose bearing brackets are easy to clean and or replace . I think I'll stick with the unsealed loose bearings .

[@EcoAdvocate]

@@boracay12 I've tried that. I wound up getting into the bottom bracket 3 times within a month or so. It was so smooooooth pedaling that first day after, then I heard clunking in the frame and the pedaling became crunchy. Repacked regreased hours later at the bike kitchen I had it apart and done again. Was fine for a bit then got crunchy again. Ugh. I wasn't able to used the bike kitchen a few months into the pandemic it closed. I'll will probably never go loose bearings again--but this looks promising! I hated the idea of trashing a cartridge that had worn out bearings but couldn't be easily opened, if that's solved it keeps those bearing protected and it will last years longer.

[@boracay12]

@@EcoAdvocate I was mistaking ,mine are caged bearings . But they get dirty easily . For $8 where I'm at I can get sealed bottom bracket with the spindle on line . Today I'll look local first . The bearings are self contained like a auto bearing and a rubber seal to keep out dirt and water . I'm looking forward to it . Upgrade time

[@B_COOPER]

@@EcoAdvocate blue lock tight and a lot of trial and error patience.

[@zellerc714]

Hey RJ - Your video gave me the confidence to pull apart my crunchy "sealed" bottom bracket to see what was going in there. Bearings were fine, no rust or dirt but dry as a bone. I cleaned and greased and reassembled and it works perfectly! It's a crime to toss out that entire assembly for the want of a dab of grease! Thanks for your excellent and informative videos. You are providing a great service to us!

[@alantaylor6691]

So bloody true mate.

[@forevercomputing]

Swapping out new parts is faster... Faster jobs = more jobs = more money for shops

[@alsatian9130]

@@forevercomputing : Like my grandfather used to say, "You're speaking Greek to me!!"

[@alsatian9130]

Carl Zeller: you Sir, I understand!!

[@woofbark4475]

Nice I've got some slightly rough bearings and now they are going to be dealt with. Very good video reminded me of doing the trailer bearings with my dad when we both were younger men. Good times and great to see your clear repair directions and tools used.

[@EntropyOCD]

Simple commodity 68mm English threaded BB's are 20 to 40 USD now. This video aged well with the pandemic, hyperinflation, and supply chain issues. Thank You RJ!

[@rangersmith4652]

Even so, I suspect this unit will not last long after having been "serviced." The "seals" are clearly no longer sealing, with is in large part what led to the unit's demise in the first place. I have two similar units to do in the next few weeks (both original and over 20 years old), and I don't know yet exactly which sealed units they are (beyond that one is square taper, the other is Octalink), but I'm 95% sure I can still acquire replacements in October 2022. Since these two bikes are in regular use and will continue to be, new parts make more sense and will probably last until I retire the bikes.

[@IronHorsey3]

@@rangersmith4652 - Yes, old beat up bearings are not going to be effective just because they've seen new grease added. You would need to replace the bearings to obtain a realization of what potential is available.

[@harv855]

Very useful video, I learned a lot about these so-called sealed cartridge bottom brackets. The fact that the Shimano unit that you disassembled has cone races instead of circular races explains why some of these come out of the box with too-tight or too-loose bearings. They are ADJUSTABLE and are not carefully adjusted at the factory. Also, the assembly you showed looked more like a headset in that it uses a tab washer over the adjustable cone, and then a locknut. This can be tricky to get right the first time, as you demonstrated. From now on, I will be seeing if I can dial in the adjustment on new units before installation. Also, I have come to the conclusion that the old style crank bearings are superior to the unit that you reviewed because they have larger balls, are readily rebuildable, easily adjustable without partial disassembly, have two supported cups (not just supported on one side) and have replaceable parts (spindle and cups).

[@RJTheBikeGuy]

Harv Woien Not sure if I would mess with a new one. I am guessing they are pretty well adjusted coming out of the factory. You could always switch to GXP. But then you would have to change the crankset too. Square Taper Bottom Bracket To GPX Bottom Bracket Replacement

[@stevemillerster]

I always enjoy your videos. I appreciate that you rebuilt a part that wouldn't normally be rebuilt. It's really interesting and educational to watch! Keep it up👍🏻

[@christopherrogi7405]

Thanks man, you're the reason why I keep going when I'm out of nerves while restoring some old bikes of mine. Great effort, great videos, really helped me out a lot! Cheers mate!

[@clayton7825]

Thanks Again! You saved my bottom bracket from the dumpster. For the record BB-LP26 comes apart exactly the same way yours did.

[@bikeme1969]

Well - I guess timing is everything. Just replaced a sealed cartridge bottom bracket bearing set with a new one and spent about $20 to do so. And just one day later, I run across your video here on overhauling one of these sealed cartridge units. And guess what - the one you did is the exact same one I just replaced. So, just for practice and to have a possible spare for another bike down the line, I followed your excellent, step-by-step procedures and now have a perfectly running sealed cartridge bottom bracket bearing set. Besides needlessly spending about $20, it also turned out the new one that’s now on the bike had some less than perfect threading that made it very difficult to thread on the bottom bracket shell. It’s on and it’s one correctly but I pity the poor soul who years from now will be faced with getting this thing off!! Anyway, your video was outstanding!! Just one question - how did you know that first lock nut on the non-drive side was a left handed thread? Was that through trial and error or did you know something to indicate it would be a left handed thread?

[@kevinpeterson294]

Thanks for this awesome video! I just bought a new a Schwinn Solara from Target on EBay, and not even 20 miles my bike made creaking and knocking sounds from the bottom bracket.Like they forgotten grease in the bearings. I now have to teardown a brand new bike and hopefully this solution will fix it!!! Thanks again!

[@DD-cw7zn]

Thanks for the thoroughness of the video. I took apart my bracket and put it back together again with confidence. It spins very smoothly now.

[@andreiguarin1409]

Thank you for this! Even if I don't plan on overhauling, it actually helped me understand the inner workings of my BB!

[@sweepsp8468]

Only just came across this post (2022). Well it's an eye opener, "sealed unit" what a scam and that's all it is. how much money and waste has been generated by these units. Shimano must be laughing all the way to the bank, well thanks to you a lot of people will save money. Your posts have given me the confideance to do all my own work on my bikes, thank you and keep up the good work.

[@nukix3128]

Love your vids. I find old bikes all the time and watch for anything I need to fix. Thx man. Keep up the good work!

[@COMB0RICO]

Nice to know these can be reserviced! Thanks from Texas!

[@alexanderlawson1649]

Never thought about regreasing one of those. I have several used ones in my spare parts box, so thats a project for a rainy day. Thanks for the vid.

[@byrondejarlo7568]

Still relevant in 2021. Thanks bike boss.

[@mckav2358]

This clip was "FANTASTIC" an "IMMENSE" Help!!! Thanx RJ

[@Quadflash]

Cool! Didn't know that a sealed BB could be rebuilt that easily. Your tutorial will save our Co-op a lot of time and money.

[@misternobody4644]

@David Sonnen You might have to replace the bearings if they are pitted. Or if the cones are in bad shape, then it's better to just buy a new bottom bracket. But if you have extra bearings available, grease, and the cones appear in good shape, then you can take some time to do it yourself if you have the patience and time.

[@fredbissnette3104]

I just bought one of these for my fixie nice to know I can service it

[@w.m.aslam-author]

Thanks for this, I needed another reminder today. I'm working on my cherished 2008 mountain bike and pretty much overhauling all of the moving components. Your videos have made my work so much easier, and ordering parts online has been less confusing. Thanks.

[@andymingo-kf1gq]

Great video 🤩

[@Merseysiderful]

Surprised that that there was hardly any grease on the bearings after disassembly. Either water gets in them or hardly any grease is applied in the factory.

[@Snagmaster30lb]

Can I just show some gratitude real quick? Forever grateful for my father youtube.

[@evgenytsvetikov7623]

RJ, thank you very much! The video is over usefull, though your speech is fast enough for foreigners. But it's better to see 1 time than to hear 100 times! :-)

[@Fredwitrave]

Nice job! When working with loose bearings I always use a telescopic magnet to keep them together.

[@marblox9300]

Thank You Bike Guy.!!!

[@hansdybka1331]

ya...i love it when i can rebuild something..thks for this...luv it THKS!!!

[@woofbark4475]

Great video loved the directions and advice.

[@rvdboston9568]

Thanks! Left thread - that is what I missed. I think lock nut goes serrated side in. Also, on my bike plastic cap goes on that lock nut, not the other size.

[@ShitGetsOld]

Everybody keeps saying that I just need to replace my BB and buy a new. Incidentally my cheap ass don't want to pay for a new one without trying to fix it myself. I learn something new every time I watch a video on your channel RJ! You don't know how lucky we are to have you uploading these for free! Saving cyclists like me a ton of money in the long run. Love from the Philippines!

[@boracay12]

Hey ! Retired American ex pat in the Philippines . My bottom.bracket is starting to creak already after only six months . This after switching from the old style unsealed bb . But it's only $10 US . . I'll probably buy a new one AND take the current one apart to rebuild it as a spare . I always check rj's channel as a refresher course . My favorite .

[@radekxyz196]

Bardzo dobry sposób na regenerację suportu 👍☺pozdrawiam Poland

[@kennethpararo2162]

I was out walking with a friend yesterday and he was talking about how his sealed square taper bottom bracket had been giving him some issues, so he had ordered a new one to replace it. He threw the old one away and then wished that he had kept it to perform a postmortem to see why/where it had failed. Not having seen this specific video but being VERY familiar with your channel, I assured him that you had probably overhauled one and I told him I send a link to the video later that day if I could find it. Lo' and behold, RJ, you never disappoint! I'd give this video two thumbs, if I could. Thank you for your thoroughness and curiosity. For all of us cyclists and DIYers, you are the giant upon whose shoulders we stand atop.

[@alsatian9130]

Kenneth you said it right!!

[@krzemian]

three thumbs up are always better than two

[@richardmuller2692]

Excellent video man!!!!!

[@GiGaSzS]

Thanks for the video :) Shimano loves to make impossible to tighten things. Once I have disassembled Shimano pedals: PD-M324. The bearings are hold in place using 2 cones like the hubs use. The catch is that the cones need to be tightened inside a tube. I was able to find the tool to tighten them on web, but costs over 50€ (more than a new pair of pedals!!!) and is almost impossible to source. So I have rather bought new non Shimano pedals that are able to be serviced. Since after many attempts I was not able to tighten those Shimano pedals (PD-M324) to proper tension. Ether too tight or too loose. I have also find that original grease Shimano uses is low quality, so I usually just replace it with new, if able. I have also come across Shimano hubs that are tightened improperly (too tight or loose)!

[@RJTheBikeGuy]

kzbin.info/www/bejne/pGqnYmmqbbx-ZpI

[@____________________________.x]

My BB tool arrived today so I was wondering if this was even possible, so thanks for the video. I was a bit confused about which side was the drive side, but I guess I can rewatch it and figure it out.

[@dtcho100]

Excellent video. Useful too, as replacement sealed cartridge bearings for some models are now quite hard to find.

[@RonPorteous]

I have an almost brand new BB that is creaking already. Fortunately I did not throw out my old one, so will try this and see if I can resurrect it and fix them both. Thanks!

[@paologoglia7639]

never seen one of these being opened. Good job!

[@hermandormehl8827]

Thanks for this video. I feel a little bit of play in my bb. So I thought, let me pop in here, to see if it's fixable. (our LBS's charge ridiculous amounts of cash for new ones) I never knew that it can be opened. I will fix mine this weekend. Thanks RJ!

[@rbaleksandar]

+Herman Dormehl Frankly I have noticed ever so often that the more you go into the details of the bicycle parts the more difficult it is to find just that single part that you need in order for the whole thing to work. And when you do find it in 99% of all cases it costs almost as much as buying a whole new mechanism (which includes that part). For such parts of the bicycle I would suggest either finding a spare part from some other bicycle or just buy that part new from a shop.

[@hermandormehl8827]

Well, if all thats needed, is to tighten the thing, which will squeeze another 2000 km out of it, why pay R300 for a new one, yet???

[@agunggunawan899]

thanks man. it does really help to maintain my own bike.

[@faridoonranjbar6427]

Great fan of you RJ From North Afghanistan

[@mickyroo25]

Great video I hate the idea of throwing the whole bottom bracket away so hope mines like this

[@alansmart6588]

I have that exact awl! I think I've had it about 30 years.

[@fordroams]

This is so helpful and informative. Thank you very much for sharing!

[@attilakovacs5803]

Excellent, thank you!👍🚴‍♀️

[@laurentiussoepomo7747]

Your video is very interesting and helpful.

[@TheSuperScout1]

Thank you! Just opened mine up and followed these steps exactly! I noticed the pedaling being not smooth so I figured a good re-grease should help. Wheel bearings may have contributed as they also feel a bit rough after taking off the wheel here, so that's next on the list. Have you done a video on a simple rear wheel hub bearing re-grease? Thanks, -SS1 1998 Schwinn Mesa GSX

[@RJTheBikeGuy]

SuperScout1 kzbin.info/www/bejne/lZLbqIlsqMuUd9U

[@brrrt6666]

Mine came without keyed washer, makes it near impossible to reassemble, still great video...

[@hectorperu28lima17]

Gracias maestro! No sabía que esta pieza se podía reparar! Thank's so much !

[@RJTheBikeGuy]

Generally it's meant to be replaced, but some of them can be overhauled.

[@bruce5799]

Use and repair is good for your pocket and the environment.I will stick with Cup and Cone BB

[@Suesses-Einhorn]

Use MoS2 grease, its 100x better than normal grease, you grease basically 1x. I would like to see some various sealed cartridges from the inside.

[@stevetasse5670]

Good work

[@ДенисАндрушко-з6ш]

Thanks for this video 👍✊👍

[@billmaghan]

Nice demo. Thankyou.

[@amrelwerein6442]

Thanks Its very helpful

[@AvaPxiaO]

I've been thinking of doing something like this for years, I haven't had one like it. The last 10 I've seen were all cartridge. I also thought about getting a cartridge one rebuilt and I wonder how much of a trouble it would be to press them out. I assume the right one is against the body, the left one is against the shaft, so pressing the drive side spindle out splits the assembly in two halves. The reason I haven't done it is because I have 3 spare near perfect ones in the box, and only one of such type on a bike, so I don't fix things that aren't broken.

[@joelzeigler6738]

I was glad to see this video, but my BB Cartridge [Shimano UN-52] is very unlike this one. I found no online help, so a friend and I gave it a go. I won't explain how it's done, since you either know already or would rather figure it out yourself, but there are no fasteners of any kind holding it together. It's a clever puzzle and I will say it is like cracking a code. I'm not set up to do a video so I think it would be great if you would do one for this type of BB. If you happen to need any hints let me know.

[@davelordy]

I need hints ! (Shimano BB UN52 . . . no lock nut . . ?)

[@tompearce6312]

Great! Going to check mine out later to see if I can figure out why it’s become rough. I remember my Dad teaching me to overhaul the old school cup and cone bearings on my BMX years ago :)

[@savoirfaire8979]

Would be nice if the spindles could be swapped for different lengths.

[@waggaclint]

Very helpful thankyou 👍

[@deopersad2915]

Awesome thanks, will try but if not will buy new one as mine dosn't have a nut exposed, as I'm doing up bike's, now in New Zealand cheers

[@boracay12]

Being in the Philippines , mine is some kind of cheap Chinese bb also no nut . Just a sealed bearing on top . I can't move it ... But I paid about$5 usa for it . And it lasted 6 months 9? I don't remember . I hand replacement on hand already . Edit Opps I spoke to soon . I Drove the shaft out from the threaded side . That left a sealed bearing inside the cartridge that can be driving out and replaced along with other ......if I can find them in stock . Or buy another $5 spare .

[@johngrossbohlin7582]

I noticed that the lock nut was reinstalled upside down... it came off with the serrations facing the cone/lock washer and went back on with the serrations facing up... I imagine the serrations are intended to act as they do on a cassette lock ring. Perhaps it is tight enough to not matter...

[@jamestastic70]

Now I'm thinking I will have a go as they cant get new parts till end of March

[@harutanaka3647]

thankyou .... try many time can not take it apart.

[@forevercomputing]

Rebuilt? Looks more like a service to me ;)

[@a.v.k.2852]

Sealed wheel hubs can therefore also be repaired?

[@SeanoHermano]

Thanks for all Your very informative videos, RJ. Been following Your channel for a few years now. Is marine grease more water repellent than standard bicycle grease (such as that available from Park Tool)? Or is it the same thing?

[@nageshtagadur]

is marie grease, silicon/ teflon grease,.......?

[@harppa6]

At 7:30 , locknut is downside up.

[@vidarv.9010]

I believe my lbs never does service bottom brackets like RJ does in the video. Instead it is more profitable for them to throw it and install a brand new one. Typical western world mentality. The lbs (in Norway) i mention also seem to throw away new bicycle parts of some reason (perhaps lack of space in store). I have seen wheels, dozen new bottom brackets, and various other new or far off end of life cycle parts in their metal waste container. I enjoy learning from RJ and repairing parts and bicycles instead of buying a new one!

[@panoskaravassilis3648]

RJ, Can you please produce a video showing how to disassembly/Assembly an octalink sealed cartridge bottom bracket. Thank you in advance. K.P from Athens, Greece.

[@mbazani]

man, maybe this can help you: kzbin.info/www/bejne/r3PRiqKPi7mhotE

[@mobeenhaneef3325]

Hello RJ, I wish someday you tell us how to service a Shimano Bottom Bracket UN-55. I have one, i upgraded from vintage to sealed bottom bracket after looking one of your videos. I am always curious about things, i opened it up, reached to the ball bearings , but i did not try to take them out as they were fixed like in cartridge angular contact sealed ball bearing. I do not want to destroy it just for experiment because in my country these things are difficult to find. So just try, if it is possible kindly show us a video :)

[@joelzeigler6738]

I just did this to my UN-52 which may be built like the 55. Here's the code: Remove the rubber seal carefully. Next is a plastic cage which acts as a spacer between the ball bearings. Carefully pull that out with a small probing tool. Now push all the bearings together. Align left and right sets so they are opposite each other in their races. The balls will reach a little more than halfway around the spindle. You should be able to see that the spindle will almost fall out. Lay the cartridge on your bench with the bearings up and the spindle down. Hold the cartridge in one hand and smack the end of the spindle down [If the bearings are dry, lube them first]. It will pop out on that side. Rotate the cartridge and smack the other end of the spindle down. It will pop out. Clean and lube everything. Reassembly is the exact opposite. I suggested to RJ that he make a video of this. It's a great puzzle.

[@vjekoslavzivko3616]

Do you use grease on locking washer when locking? I will measure torque needed for loosing nut on fabric assembled BB cartridge. I belive somenthing lower torque is used for locking, so using same torque for locking must be good.

[@kingcarcas1349]

the bike guy should bearings of all sizes

[@RJTheBikeGuy]

What?

[@carmenherrera9893]

Great video. Is the Shimano BB-5500 like that one? i'd like to service mine. Thanks

[@chrisgmtech8421]

Nice

[@sauldelman3469]

I am planning to follow this video. But I do have a problem removing the pedal arm from the square bottom bracket. I tried the special tool but that ruined the thread on the aluminum pedal arm. I tried knocking and pooling but it won't move a notch. Any ideas?

[@RJTheBikeGuy]

Check this out: How To Repair Damaged Crank Arm Threads

[@walkroll296]

How did you know that the spindle was left-hand (reverse) threaded? Could you see the threads? Where you thinking about the direction the bearing would be rotating? I'm very curious.

[@RJTheBikeGuy]

I had read descriptions from other people on how they come apart.

[@ChrisinOSMS]

That’s an honorable answer, RJ.

[@aigarsmillers1406]

tnx

[@HenriTheHorse1]

great job; HenkR

[@vjekoslavzivko3616]

I hope to hear which torque (?Nm) is used to lock locking nut. I damaged four pins on locking washer. I used round wrench 20mm (fork-round wrench for standard nuts, gabel-ringschlussel on german) which was redone each second tooth was flattened with rasp. New wrench 12 tooth, redone 6 flattened and 6 original. Hello from Croatia

[@RJTheBikeGuy]

These were never intended to be overhauled. So I doubt you will find torque specifications.

[@ricardotijerina886]

Awesome video. where can i buy the bearings? and why marine grease is used?

[@RJTheBikeGuy]

Amazon, ebay, local bike shop, etc. It doesn't break down in water, does a great job, and not too expensive.

[@OZmarkRoy]

Nicely done. Any ideas on how to take apart a sealed BB that doesn't show any lock-nuts at either end? Mine is a Truvativ BB-06-PSPL-113/68. It appears as if Truvativ really didn't want one ever opened and locked everything in with press-fit or shrink-fit bushes. It's the one part of my bike that I haven't managed to get into yet and neither can my vendor find a replacement for. I loosened up the roughness and sticky-ness with a generous bath of WD40 but I know there's no way to get any grease or new balls into it without disassembly. Any leads?

[@RJTheBikeGuy]

Generally they were never intended to be opened. Just replaced. But some can be opened. It might be able to be opened, or not. If you got WD-40 in there, there would have removed all the old grease. You might not able to get any grease into it. But you might be able to get some oil into it. WD-40 is a terrible lubricant.

[@OZmarkRoy]

Thanks! Confirmed my suspicions. The way this BB sounded/felt, I don't think there was any grease left in it! So, I'll just try to coax in some thick lube and run it as far as it'll go. Thanks again for your quick response.

[@tomcatt1824]

OZmark Roy just a thought, couldn't U drill a hole install a grease fitting, pump it full of grease then remove grease fitting n put a set screw into hole

[@TreyRois]

Would you use Lithium grease(white) or any difference with other typical greases?

[@RJTheBikeGuy]

I typically use marine grease which is designed for wheel bearings and holds up when exposed to water.

[@RJTheBikeGuy]

Go to your auto parts store and buy marine grease.

[@neilfroggycrompton2466]

do the plastic threaded end caps clinch up tight against the ends of the cartridge in the frame bottom bracket?,wouldn't the bearings wear quickly into the plastic or is it very hard plastic?

[@RJTheBikeGuy]

neil crompton The bearings don't touch the plastic parts.

[@neilfroggycrompton2466]

do the end caps pull up tight (or loose) to the ends of the cartridge when installed into the bb?

[@RJTheBikeGuy]

neil crompton The end cap holds onto the outside of the cartridge. And it may or may not be tight against the end of the cartridge depending on the model.

[@neilfroggycrompton2466]

ok thx,i asked as sometime soon i'm going to buy a new mountain bike,was thinking possibly giant or gt,any recomendations for brands to look at,would love to own a cannondale but way too expensive :D

[@pavlepopovic2008]

Is this possible with octalink fc7700 dura ace

[@RJTheBikeGuy]

I don't know. Maybe.

[@tatersinc]

On a bottom bracket cartridge that I have, a Shimano, the removable nut looks like it's on the drive side. Your removable nut looks like it was on the the non-drive side since it was under the removable cup. My removable nut looks like it's on the fixed side of the bottom bracket. It's really on tight. If that is actually the removable nut, on mine, which way do you think it would turn to loosen? Anyone?

[@RJTheBikeGuy]

Sorry, I don't know. Take a guess and try it

[@李耀輝-m1j]

你很棒

[@ethanharding3573]

When I hop on my bike my cranks will move ever so slightly like there is play in the splines of the bottom bracket and cranks. how would I tell weather it's the bottom brackets splines or the cranks splines that are wearing out?

[@RJTheBikeGuy]

Take it apart and look.

[@imhs81]

hello rj, I've tried taking my bb-un26 apart and it's totally different than this. have you tried it as well?

[@RJTheBikeGuy]

I haven't done that specific one. I am guessing it is actually similar. Though I think there is a cover that needs to be removed to access insides like on this one. They were not really intended to be overhauled, but to be replaced.

[@imhs81]

+RJ The Bike Guy thank you so much! i bought another bb-un26 today because I chose the wrong size in spring. I'll let you know if I can take it apart!!

[@edoedika1099]

Hallo i have watched your videos for over 1 year and i have a question can i use a 8 speed chain on a 9 speed cassete pliss answer as soon you can thanx..

[@RJTheBikeGuy]

A 9 speed chain is slightly narrower than an 8 speed chain, so you should get a 9 speed chain.

[@edoedika1099]

Thanx sooo mutch now I know what kind of chain to buy thanx

[@maxfactor4209]

it cost just £20 here in UK.. and it last around 5K kilometers

[@RJTheBikeGuy]

I would have expected a longer life.

[@Dogsparkster]

if a bottom bracket is as you said in the beginning rough then can that make a grinding feeling on your feet while riding while not making any noise

[@RJTheBikeGuy]

Yes.

[@Dogsparkster]

do i need a crank puller to get to the inside of a bottom bracket or is it possible without?

[@RJTheBikeGuy]

It is probably possible to do it without one, but you risk damaging the parts. Spend the $5-$15 bucks for the tool and do it right.

[@Dogsparkster]

is there a specific one I need or now days are they all pretty much the same connector let's say like ccp-22 or something

[@RJTheBikeGuy]

They are pretty standard. Unless you have old Stronglight or TA cranks, you should be fine.

[@misternobody4644]

@Rj The Bike Guy Can you convert the sealed cartridge into a cup and cone bottom bracket? I want to convert my bottom bracket to vintage cup and cone style, but the cup and cone bottom brackets are no longer on sale brand new and I was thinking probably sourcing some parts from a sealed cartridge bottom bracket? What do you think?

[@RJTheBikeGuy]

No you can't just pull parts from the sealed cartridge. You can probably find a vintage BB on ebay.

[@rhammm3045]

What about tange bottom bracket?is there a tutorial?

[@RJTheBikeGuy]

Tange is a brand of cro-moly steel. Not a different type of bottom bracket.

[@dylanewelch]

would it be better to rebuild or replace these on a cheap bike if your local shop doesn't have the right size? I'm riding a big box bike that I've been upgrading. don't want a new bike right now but my bb is noisy

[@RJTheBikeGuy]

Generally these were never meant to be rebuilt. But I did it just because. Buy a replacement on Amazon.

[@dylanewelch]

10-4 sir. thanks for your informative videos. you've helped me restore a 1980's panasonic villager II. your videos made it easy and fun

[@neilfroggycrompton2466]

what's with the mismatched bb sizes?,does the extra bb on 1 side counter the imbalance?,or is it the race thickness?,as usual rj another xlnt video (Y)

[@RJTheBikeGuy]

neil crompton It has to do with the cranksets. Different cranksets require different length spindles so the chainline is correct. Triples generally need a longer spindle than doubles.

[@neilfroggycrompton2466]

to stop the chainrings from hitting the chainstay :D

[@RJTheBikeGuy]

That too, but mostly the chainline.

[@patwang84]

Shyflirt, how do you disassemnly a shimano BuN52 bottom bracket? The BB-UN52 has no nut or screw like yours to open on that side. Or is that one just for using it and throwing away after it is worn out?

[@cup_and_cone]

Not rebuildable... :-/ Seems like easiest way to tell if a Shimano BB is not rebuildable is if it says "Sealed Cartridge Unit" on it. The ones that I've seen that are rebuildable don't say this, and ones that aren't rebuildable do.

[@RJTheBikeGuy]

Do you mean BB-UN52?. I found a picture of a BB-UN51, and it looks like it has a little metal cap pressed on over the lock nut. If it were mine, and I wanted to play, I would try to figure out how to get that little cap off without damaging it too badly. Might not be possible. thechosendude, mine says "Sealed Cartridge Bottom Bracket" on the little plastic cap that I press on at the end.

[@patwang84]

shyflirt1 oh sorry about my bad writing i mean Shimano BB-UN52 also are BB-UN55 models the same how they look or built. yeah those are not possible to open, there is no nut or cone on them. I guess they are just "trash" after they worn out.

[@RJTheBikeGuy]

I think there might be a nut. But it is hidden under a metal plate that is pressed on the spindle. You can try to pry off the plate and see what is under there. See if you can get the place off without damaging it, or with minimal damage tot he plate, so that you might be able to put it on again. If you are going to throw it away, can't hurt to try.

[@vladimirramil2577]

Rj the bike guy is it possible on one piece cranks

[@RJTheBikeGuy]

kzbin.info/www/bejne/bam3e2eQorygi5o And DO NOT ask the same question in more than one place!!!!!

[@DavidGamero]

hey im wondering how i know if i need a new bottom bracket or if i should just do what is shown in this video. All of the forums that ive read about sealed cartridge bottom bracket problems always end up in the suggestion to just buy a new bottom bracket.The only problem i can indentify with mine is a loud creaking sound when pedaling hard, there doesnt seem to be any play when i move the cranks however, but when i flip the bike upside down there is kind of a rumbling when i spin the cranks, but that could be a number of other things too.

[@RJTheBikeGuy]

If you can buy a new one, that is probably the better solution. This video is more for people who don't have access to buy a new one, or just want to rebuild it.

[@DavidGamero]

@@RJTheBikeGuy yeah thanks for responding, my dad told me to try spraying some white lithium grease on it.... and the sound completely went away! I didnt try this because the sound was so loud and bad sounding that i thought it must have been something worse than that, also non of the forums mentioned trying this lol.