How To Remove & Install A Threaded Bottom Bracket On Your Bike | GCN Tech Monday Maintenance

In recent years, bike manufacturers have started to spec new road bikes with threaded bottom brackets again. Fortunately, threaded bottom brackets are super simple to remove and install, making home maintenance a lot easier. In this video, Alex shows you the best way to correctly remove and install your threaded bb!
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[@gcntech]

Did this video help you fit a new BB? Let us know 👇

[@hondasaurusrex6998]

Yes it did help. Also, show shopping old style BB for the one you just show. If there are any major differences.

[@mathewrose2951]

I am upgrading my old DuraAce7800 drivetrain to 9100 mechanical (I'm still resisting moving to Di2). Truth be told, however, having just spent 2500 dollars on the new groupset and BB along with a OSPW from Ceramicspeed, I'm going to let my LBS convert my bike for me. I appreciate the video giving me the know-how to work on it if needed, though.

[@chris1275cc]

I`d love to know how you got past 35 NM on a Park TW 5.2 it only goes up to 14! The correct (TW 6.2) is right there on the wall. Ya numpty 🤦‍♂️

[@AJFixie]

@@mathewrose2951 when you do it yourself at least you know what's been done. Plus it's satisfying. Get some tools, whatch the videos and give it a go. Before you know it, you'll be an expert.

[@SLOPPEWALL]

@@AJFixie and watch a vid how to use a torque wrench.

[@jasongirvan6729]

Omg Alex 😱 whom taught you to use a torque wrench?? “Turn till you here the click” (@ 5:50) but you carry on past the click considerably each and every time and I’ve noticed this before in another video but wast sure then and just can’t remember which. Stop 🛑 as soon as it click man

[@Illumaca]

I've noticed this also, thanks for the comment.

[@mongose101]

Yes, I noticed to.

[@nimblybimbly4002]

I noticed this comment before I got to that part of the video and I assumed you were overreacting but you weren't. He is definitely not using the torque wrench properly.

[@aarjayemm]

He is not using the right torque wrench. The one he is using only goes to 14nm so he had to keep going after it clicked.... 🤦🏻‍♂️

[@aarjayemm]

Funny thing I just noticed.... the right torque wrench which can handle the range needed is actually sitting on the wall behind!! 🤦🏻‍♂️🤦🏻‍♂️🤦🏻‍♂️

[@danielmarket9225]

Fantastic and clear video. Covered EVERYTHING I needed to know. THANKS!

[@allenhutcheson2668]

At 5:30 the BB torque required is stated as 35-45 Nm. The torque tool used is the Park Tool TW-5.2. This torque tool provides a maximum torque of 14 Nm.

[@MarkBurghouwt]

Yeah you see him adding some extra torque to it after it has clicked, so he explained it well but performed poorly

[@showze21]

yes, it helped, very reassuring that its a relatively simple task that can be accomplished correctly by the average person

[@OllyKilo]

Working up the courage to do this one day. Then the freehub.

[@andrewkey9401]

Only the drive side fitting was shown in any detail. The non drive side fitting is important too, especially not overtightening the preload on a left Shimano crank. Also it's best to have the chain removed, so that you can check the cranks spin freely , more.difficult to do when the chain is on.

[@Fixingeverthingwithaengine567]

The funny thing is that I know how to do it,but I still watch it.

[@lukasek1234]

Tru

[@andystone5487]

Me too.... 🙄

[@PaulMoran01]

Yup, but it's satisfying to watch 🤓

[@NealWilliams]

Never hurts to catch up on the basics.

[@dnsussman]

Even after watching and understanding there is still trepidation.

[@jonathanhill9920]

I like Alex doing these videos

[@SLOPPEWALL]

I like Jon doing these videos.

[@othmanalkhayat9724]

From what I saw the threaded is the best, not just for using but definitely in maintenance and installing, the worst is the cartridge, I really don’t know why they still making it, the cartridge is like one time installation and no returning back, they won’t open and they get jammed quickly, but the threaded is easy to handle easy to fix, I hope and I wish that all the bikes will become threaded!!

[@gowikuscommunityproduction4605]

cycling exercise makes the body fresh increase immunity in the body, bright mind, body, healthy, looks like the body will restore new stamina, happy thoughts, Thank you

[@daviddawn9043]

Very clear

[@Tazfiend]

Got to ask why you kept tightening after the torque wrench clicked? Especially on the drive side, it appeared that your overtorqued the BB.

[@ldavid2]

"However in the last few years we've seen brands start to move back to threaded bottom bracket" because they were unable to manufacture proper frames...

[@Aniqa101]

@@robertcowling4313 Just because you don't understand what he says doesn't mean Hambini talks trash.

[@Aniqa101]

Yes even the new and super duper light Specialized Atheos (carbon) uses a threaded BB (metal) meaning a weak spot. That's embarrassing.

[@Aniqa101]

@@robertcowling4313 Ok, I might have somewhat misunderstood your comment on Hambini.

[@Aniqa101]

@@Bungle2010 So you are ok with crappy press fit BB shells?

[@gedpitts8879]

Should you also apply grease to the crank before refitting?

[@WilliamParsons2nd]

Better to apply grease to inner edge of the bracket seal fit the crank and wipe off any excess. If you apply grease to the crank excess grease will gather between the inner gear and frame collecting grime.

[@mrichards55]

Why did Trek and Cannondale push creaky direct-fits / press-fits for so many years?

[@hondasaurusrex6998]

Because it was profitable?

[@yk-pm7fv]

probably since PF are much better (more efficient, stronger, stiffer), but not when you don't have twats designing and building your shite frame like cannondale, trek, cervelo, etc. if you think about it, a threaded bb now adays is just a pf with the bearings already pressed into well manufactured cups.

[@jasongirvan6729]

It’s easier, it’s stronger, you an fit larger bearings, have the bearings inside the frame rather than hanging from the frame. If you haven’t heard of Hambini you just might want to check him out and learn the actual engineering and heal teach you a thing or two about ceramic bearings as well and before you say you have and he’s a twat then go check out “peak torque” too as well as he also backs the engineering and also shows ways to get the best engineering at the best dollar and reasons. These guys aren’t affiliated to anyone. Oh by the way best bb by engineering standards :bb-386EVO

[@mrichards55]

@@jasongirvan6729 Watched Hambini’s video and he found microscopic misalignment in the bottom bracket bore and drew an exaggerated starfish. Apparently microscopic differences to a perfect circle cause major problems after a direct-fit / press-fit BB is fitted. No thanks, I’ll stick to a threaded BB.

[@Aniqa101]

@@mrichards55 These "microscopic misalignments" are HUGE in engineering dimensions. Some frames don't even match the tolerances of Shimano (at least the one Canyon Speedmax of which a photo of a QC document was send to Hambini).

[@otakarsindler6117]

Alex should go to learn from Jon (former GCN presenter) or Doddy from GMBN how to service bikes...

[@paulobrien4794]

Nice. Could you do a video removing and reinstalling a PF30 adapter to BSA for Shimano please? I thought my BB was threaded until I tried to remove, had to buy the Park Tool tap tool to remove, but not 100% on installation process for new bb cups - do you press with bb cups installed or adapter first and then BB cups. Cheers, P

[@janphilmillner2307]

Brilliant as ever Alex. Thanks!

[@jeffbrunton3291]

Surely threadlocker would be better on the non drive side to guarantee it will not undo by itself?

[@RonLee96]

NOOOOOOOOOO!

[@averyhillroad235]

Italian Thread Confusion: In 1987 i bought a new Campag C Rec BB from my local shop. I had a 531 frame with English threaded BB shell. However, the shop only had an Italian threaded new BB but the mechanic said it would still fit as the Italian and English threads were very similar. Although it was a little tight when I first fitted it, the new Italian BB fitted in my English threaded frame. Therefore, the drive-side cup must have been Left hand threaded. A few years ago I bought a Pinarello F8 with italian BB shell. I spent 10 minutes trying to fit the drive-side cup, then I discovered it was Right hand threaded. When did the Italian thread standard change for BBs?

[@marciim9513]

Is that a park tool bbt 59.2 for the italian thread bb cup ?

[@Sutlore007]

before inserting the crank into the installed bottom bracket, do I need to apply some grease?

[@Aniqa101]

It helps removing the crank some months or years later.

[@kuyajayyoutubechannel6327]

Bb71 shimano press fit I cannot remove in my carbon frame because they cannot put Grease so wat I can do it so hard to remove because the press fit is have plastic cup.

[@thomasgill1]

Torque lesson required Al

[@Sam-fb8fy]

👍

[@inspiredtotired8369]

I hate to complain, but I'm going to 😉 If wanted to learn how to change a bottom bracket, I'd watch the Jon Cannings version of the video. Or any of his videos over the current crop of GCN Tech presenters efforts. The current versions have too many mistakes or miss out important information. i.e. tightening up the crank evenly, and to a torque value. Do it properly or don't bother. Or better still, bring back Jon.

[@SLOPPEWALL]

Yes. John wasn’t a teleprompter mechanics.

[@vongdong10]

I just replaced a Praxis crankset and bottom bracket to an Ultegra crankset and bottom bracket. Pissed that I had to buy a new tool to only use once.

[@spoeny]

Specialized Allez?

[@vongdong10]

@@spoeny specialized roubaix sport. I don't know why specilize use praxis cranksets at all.

[@rubbercow1547]

At 5:00: Or the tube has slipped and isn't fitting inside the other end. It happens rarely, but be aware of it, JIC.

[@oldguyonabike36]

... how many GCNs does it take to screw in a bottom bracket? kzbin.info/www/bejne/eIG7aXusaLWdoZI

[@valentinabout8666]

*ASKGCNTECH: Hi Alex, can you fit an Mtb on a wahoo kickr. TIA

[@jasonmcgrody9472]

Yes. I have a Trek Verve 2 perma-mounted to my Wahoo Kickr. It's a city hybrid and not a mountain bike but if that works a mountain bike will work. The Kickr will come with different hardware to mount QR or Thru-axle. Then all you need is a spacer for the rear cassette. In my case, the Trek Verve 2 has an 8-speed cassette

[@JMcLeodKC711]

@0:17.....However.....we’re going back to the way we did things for a really long time. Sorry about the epic mistake.

[@williamhogan2744]

Before you start, give thanks your bike isn't bb30

[@TK-mk9nv]

How did GCN know what I was researching 10mins ago?

[@RobinHood-yk8og]

"Next week we'll show you how to undo a screw..." - Barrel Scraper. I appreciate that real world cycling is a little light on the gorund right now, but seriously!

[@RobinHood-yk8og]

@@Bungle2010 I'm not the one trawling the comments section of week old videos.

[@RobinHood-yk8og]

​@@Bungle2010 and you're trying to psychoanalyse someone you've never met based on a comment from a youtube video... well done idiot.

[@RobinHood-yk8og]

@@Bungle2010 "Get a life ffs." "posting ridiculous, asinine, know it all, comments. People like you are a blight on the cycling community." ... but I'm the one with a God complex? Whatever you're smoking, I'll take two, thanks.

[@dparrigo]

#ASKGCNTECH - are there any real / quantifiable benefits to an oval chainring over round ones? If they were that much better, why wouldn’t top end bikes come equipped with them? Thanks!

[@showze21]

people with arthritic knees say they feel less knee pain when cycling when they use the oval chain rings

[@mogglie]

Isn’t this the greatest question never answered in cycling history. Oval rings makes sense that they should be better. But after years and years of testing. No one knows.

[@adriannowak9384]

Wrong torque wrench use... When it kliks do not pull any more!

[@MJarthur95]

Threaded is way easier for maintenance, #BringBackThreadedBottomBrackets

[@JulianAndresKlode]

Italian is easy, but if you want to use torque wrench on English one you need a torque wrench that works in both directions, and they're more rare and expensive.

[@yk-pm7fv]

uhhh, no, they're not that rare

[@JulianAndresKlode]

@@yk-pm7fv I think maybe like 1 in 5 wrenches also work the left way around :-)

[@lalocarrillo97]

Can someone please explain to me how the drive side on an English BB has a reverse threading? Wouldn't the rotation of the crank create a possibility for the reverse threading to come loose? Just a bit confused on how that works, thanks in advance for any help.

[@michaelparr3411]

Look up "mechanical precession" (Wikipedia has a good starting point) or dig through Sheldon Brown to see why the drive side can unwind in an Italian thread on that side. It's not immediately intuitive until you see an animation of forces. I have older Pinarellos, all Campy old style Italian cartridge bb. Easy tech, don't have a problem with a little thread lock on that side.

[@MrLuigi-oi7gm]

I believed there are two factors that play into the explanation for why the crank side BB is reverse threaded. As the previous commenter stated, "Mechanical Precession" is one. This is hard to explain without diagrams, but it is a result of the normal (perpendicular) contact force of adjacent threads on each other that arises when you push on the pedals. There is a component of this normal force that creates a torque on the bottom bracket in the counterclockwise direction. If the crank side BB was not reverse threaded, this torque would tend to loosen the BB. ALSO, the bearings in the BB turn freely and the spindle turning clockwise rolls the ball bearings along with it, with the outboard side of each ball turning in the opposite direction of the inboard side of the ball. So, the free-rolling balls are tightening the cup as the rider pedals forward due to its reverse threading. I said this was hard to explain without diagrams! BTW, mechanical precession has nothing to do with the precession of a spinning gyroscope. Very different phenomenon.

[@thelmaviaduct]

Roadies 😂🤣😂🤣👍🏿😘

[@jamesppeto]

If you watch all of your videos on BB’s, they contradict each other. Some say don’t use grease on the bearing’s use thread lock, now your using grease?

[@pgn666]

simple: you use grease on threads for threaded bb and thread lock on press fit bearings. Actually its always the same. The threaded bottom bracket its actually threaded cups with bearings already press fit mounted form the factory.

[@chornykot03]

wow not first :)

[@henrycash7725]

Surely pedalling isn't going to loosen a 40nm BB cup

[@Aniqa101]

I agree it unlikely will loosen, but considering the size of the thread, 40 Nm is not much.

[@bjorncampos5882]

What if connor paid alex to replace his bb cuz thats connor's bike

[@dijudematthew]

Pressfit sucks! Edit: Be like aethos, they are back to threads!

[@dioscollins8124]

Agree! High maintenance not easy to install/uninstall

[@Aniqa101]

Pressfit bearings strangely only suck when used in bikes, hmm ... It's proven that some bike frames don't match the tolerances of BB manufacturers and even if they do, the tolerances are relatively huge in enigeering perspective.

[@Kingjay814]

Not sure why I watched this. My bike uses a pressfit style bracket