Everything You Need To Know About Bearings | Hambini Engineering Special

[@gcntech]

Let us know how you enjoyed this video. We're sure you are now a bearing expert! 👇

[@del7896]

Please get more people who actually know what they're talking about on the channel. Someone who actually knows aero (incidentally, Hambini could do that too), stiffness, etc.

[@someguy9520]

I know hambini from some of his vids. Very nice to see him on the GCN tech channel

[@Hambini]

I loved every minute of it! Thanks for having me.

[@johnhabjan4248]

@@Hambini Great to see you on GCN! You should be a regular... #AskHambini

[@roxic1212]

Nice to see Hambini on. 👍

[@rileyrides7813]

How did @hambini go all that segment without swearing 🤣

[@adambeevers3679]

I didn't know he could speak for more than a minute without spouting an obscenity or three.

[@cmdrrgh]

Had him on a short leash

[@Gertjuhhh93]

The first 5 minutes of the video took half an hour based on the watch time. so there was a lot of swearing cut out XD

[@mob1235]

there is a guy with a gun pointing at him and he said he will shoot if he swears

[@Mjollnir1983]

Not a single cunt was called out lol

[@paulhewitt1488]

I congratulate GCN in regard to having "courage" to introduce our learned friend Hambini to the greater cycling public . Here is a man who will tell it as it is and back up all his views with data and knowledge gained over a career within the aerospace industry. I have had the pleasure of viewing all of Hambini's videos and each one imparts knowledge which cuts through the never ending hype used within the cycling industry. Hambini is still prefer the bright orange overalls however you are the man. I'm sure The dark install would approve. Well done GCN , well done Hambini !!

[@DanCave]

Hambini is the engineering geek..

[@juanpecan7089]

GREETINGS YOU HAMBINI FAN!!

[@oreocarlton3343]

This guy should become a regular, no insult to Jon but GCN could use an engeneer together with riders. Its cool to see both perspectives, one of the designer and one of the user.

[@Richardwhite02]

just watch hambinis own channel

[@mynameisyasser]

Well said

[@0GekkeGerrit0]

I think this would upset the sponsors and their marketing department

[@oreocarlton3343]

@@0GekkeGerrit0 might be, but regarding Hambinis critique of SRAM, I dont side with him on that one. SRAM might have inferior quality control but their ideas are sometimes brilliant and made Shimano to stop slacking so in the end a part doesnt have to be mechanically good to be a great product for cycling if you follow my point but its very interesting to note the difference between cyclist and engeneer thinking.

[@Drakhra]

Bump. Another Hambini special?

[@RoddyPerry]

Hambini is an absolute LEGEND! Hopefully he will feature in the channel again in the future :-)

[@useforstuffer]

+1

[@eurobubble7068]

respect to gcn for bringing him on considering they cooperated with a certain company in the past.

[@paolocapozzi927]

I'm a mechanical engineer and enthusiast cyclist...and I absolutely LOVED this video! Please make more of this stuff!

[@81caasi]

Check out Hambini's channel

[@jeffbrunton3291]

Bought replacement bearings from Hambini, great service and price. Best available. His videos on BB30 etc are invaluable, especially if you want to replace them with something better engineered.

[@BrianRPaterson]

Yup. I watched his BB30 bearing replacement video, and then swapped out my own. With a cheap bearing press, it was much easier than I thought. One less job I need to pay a bike shop to do. Plus, buying bearings from an industrial supplier is way cheaper than ordering a "kit" from a dedicated bicycle supplier. That said, Hambini is selling Smalley snap rings for 4 quid, which seems to be the cheapest in the UK. Maybe I'll consider a kit after all. Cheers

[@jameshill6817]

What a relief to hear Hambini talk clearly and professionally, without loads of distracting swearwords. Thanks!

[@davefloyd9443]

He can talk how he wants fella, no one is forcing you to watch. He's from the North, I'm from the South but his vocabulary rolls nationwide.

[@sufyansaleem9771]

An episode on bearings, this is peak bike nerdiness, I absolutely love it.

[@juanaguilar7458]

You can't win when you're a technical expert explaining to the average viewer. You either make it comprehensible to the viewers and other 'technical experts' think you don't know what you're talking about, or you keep the knowledge true and viewers can't understand. I find myself in this situation sometimes and I totally got that vibe from Hambini.

[@TheGreenback78]

Excellent. Now let’s get him back on to talk about his aerodynamics testing on deeper section wheels. That should be fun. Although GCN might lose another sponsor or two 🤣

[@Malte1878]

Yeah that i would love to see

[@SprayIgniteBoom]

MARKETING hype 2 FLEECE the MASSES...🖖👋😱

[@edwindude9893]

Hambini is brilliant. He’s opened my eyes to the issues I’ve seen servicing and building road bikes. And how to get around them.

[@sergarlantyrell7847]

So refreshing to hear from a proper engineer especially one who can articulate the answer in such a clear and no nonsense way. Love it!

[@ambientblue-eyedmonkey8849]

proper.... Let’s take a look at his LinkedIn, hmmm it says a nobody self proclaimed engineer

[@SuperGamingeek]

Marvel: Infinity War is the most ambitious crossover event in cinematic history GCN: hold my chain lube

[@boomerangfreak]

Hold my fancy coffee I can't even properly pronounce.*

[@st3ange21]

Hold my wd-40

[@RicardoUcles95]

My chain broke reading this

[@mesere7]

i replaced my standard bb30 bearings with ntn bearings from hambini, difference was staggering, highly recommended

[@miklosbremer3120]

I have sealed ceramic bushing in my jockey wheels. I have a shimano deore xt rd-m735 sgs. That's from 1990. Pretty revolutionary stuff. I took it apart to clean and regrease about 6 months ago, everything is still functioning really smoothly. Shimano really knows how to make quality bike components.

[@myneighbourhood2842]

I've been watching Hambini for awhile now. He knows his stuff, keeps it simple, and gets rid of all the B.S. Hope to see him more on the GCN network of channels.

[@stephenwilliams9550]

If I close my eyes, Hambini is basically Brian Cox... a true legend of the bearing world!

[@charlesgraham9954]

i tried to explain drag to my friend. so, i showed him his cheap bearings create more drag than good ones. we went down a mild hill without peddling. i glided much further. now he understands.

[@stephenyates3085]

This guy is a technical genius and I love how he cuts through the marketing crap to expose the hype and I love it .

[@bicyclist2]

I have to say I'm very impressed to see Hambini here. He realy knows engineering very well. I've seen a lot of his videos on bottom bracket tolerances or lack thereof. Thank you.

[@ebigarella]

You can actually see Hambini sweating to hold himself from swearing. I can only imagine the burst of accumulated tension in an endeless stream of insults at the end of the video.

[@jimmythefish]

"I don't even wash my bike". Something inside Jon died after that.

[@javorgeorgiev6130]

I almost heard an alarm going off.

[@LegSpinna]

Ouch! There was no need for that Hambini!

[@boomerangfreak]

Not only inside Jon!

[@peglor]

Washing bikes, especially if you use degreaser is the number one way to kill your bearings prematurely. Bearing seals are very good at keeping water out, but add some surfactant such as soap/degreaser to it and the the surface tension drops right off, allowing it to wet into places normal rain/spray will never go. In the MTB world it's usually the cleanest bikes, especially full suspension ones, that have the worst bearing life. I read and article by a Santa Cruz mechanic a few years ago where they found bearing life on bikes with similar use was worst on the ones that are washed and polished the most often, with bikes that get no maintenance at all second and bikes that get the big dirt knocked off, but no degreasing/deep cleaning lasting the best. The folks who keep their bikes spotless (But ride in dirty conditions) spend too much time cleaning the bike in the first place and then have to spend even more time and money on maintenance they've caused by too much cleaning. The bike component companies love these people, I'll stick to dirty looking bikes that run for thousands of km between significant maintenance work instead.

[@JG-pw5cr]

@@peglor I don't wash my bikes either. I wipe it down with a towel and will do some other spot cleaning but find any insane deep cleaning to be a waste of my time.

[@derahmad2831]

I wish that Hambini joins the GCN TECH crew!

[@cliffcox7643]

That's trued. Maybe they should have him on when he agrees' that a product is good, thus he will always be truthful and retain his honour.

[@SprayIgniteBoom]

Yes!!!!!!

[@squivm88]

Wow, Great to see you with Hambini! He did a bang up job of minding his P's & Q's!

[@in4merATP]

Hambini climbing that learning curve at 1,000w; this was magical to watch

[@KleineJoop]

Nah that's us, thanks to his teaching.

[@TheRotwild]

Thanks for the insightful video of you guys with Hambini. What was missing was that many of them also press in on the loose side of the bearing instead of on the fixed side. With the bottom bracket, the fixed side is the outer ring to the frame and the loose side is the inner ring to the crank / shaft. Greetings Nils

[@paulhowell7103]

lost my bearings half way through great vid as always

[@gcntech]

GCN level pun.

[@gregstevenson7401]

Recently found Hambini's channel which brought me here. If you really want to geek out on Aerodynamics and other engineering science, I highly recommend. The best part is that it debunks alot of the marketing claims e.g. Ceramic bearing BB's - wish I seen it before I bought mine....

[@LagunaPadre361]

I use an NLGI grade 2 full synthetic grease for my cup and cone hub. Its PTFE based instead of lithium, which is a soap base and does NOT play well w/ water. Its been put through its paces in all of my fishing reels (heavy salt-water use) and passed w/ flying colors. It doesn't emulsify in contact w/ salt water and stays right where you put it. It goes by the name of Super Lube :)

[@thelawnet]

NLGI2 is too thick I think.

[@LagunaPadre361]

@@thelawnet it may be but its the only place that it goes in the drive-train too. I ride/race a track bike on the south Texas coast so I'm always in contact w/ that salty sea breeze. Since repacking my hub when it rains got pretty old. i decided to use the lube that i use in my reels, which recieve heavy inshore/surf abuse, to keep me from repacking as often. Lol you may lose a fraction of a watt but hey, I aint complaining. Besides, my rear wheel is fixed and acts like a flywheel while spinning. So i have that mechanical advantage that sorta cancels it out right?

[@jerrygundecker743]

GCN has access to some of the most educated people in the various industries covering the different parts of cycling, who explain clearly the principles involved. This video is a peach, and very enjoyable.

[@nimanikaiyn3392]

Wow!!! Hambini on GCN, I love it!

[@VitekHolubovsky]

Been waiting forever for this! Hambini

[@codytaylor048]

Thanks for getting Hambini on for a video. GCN continues with the valuable content!

[@richaw6689]

Top vid guys.. what a pleasure to listen to someone who knows precisely how to explain a technical topic to simple cyclists.. bang on..

[@tlfreek]

GCN needs this guy!

[@DarthJabba504]

Love the crossover. Now how about Luescher Teknik

[@Emasmim]

Yes... another technical expert that truly deserves more attentions...

[@richardhaselwood9478]

Oh please, oh please, oh please, oh please....

[@ScottWhite77]

Been a massive fan of Hambini for a while. Learnt so much about bottom brackets and bearings from his channel. Gcn for sure needs to get him involved a lot more on their channel.

[@abstractgroove160]

What a fascinating video on quite a dry subject. Get this bloke on more often!

[@TheWessexmusic]

Top marks for letting Hambini on GCN. Proves GCN independence as this guy has given some pretty full on roastings, (backed up with his knowledge), to big beasts in the cycle industry.

[@draugmithrin]

Saved a fortune by learning to remove and press in fresh bearings. Use a Hope external bottom bracket bearing tool to refurb my HT2 bb's. Also replaced the bearings, fluid and seals in my turbo trainer. It's better to use a vice or threaded rod and press them in or out, but sometimes whacking them with a hammer is the only way.

[@cyclingfreak56]

Thanks Jon, that was my fav Tech Show ever! I've tapped into Hambini videos before for tips however between you and the viewer questions that was a pretty comprehensive all I need to know presentation! Specifically the part about stainless galling other materials, that 411 was priceless! Love GCN!

[@gcntech]

Cheers Robert!

[@theillegalimmigrant9314]

You need to make him a regular. He adds a lot more to the channel. #Askhambini

[@D.Eldon_]

*This was a great video. Thanks!!!* But it seemed like a mere introduction to a summary of a synopsis to the subject. ;-D It left so many questions hanging, like "Which of the two bearing types presented in the video is superior for the various applications in a bicycle (wheel hubs, BB, headset, jockey wheels, etc)? And there were so many characteristics and specifications of bearings that were not discussed. Please bring your Hambini engineer back for some followup videos. In addition to the above, here are some more questions that come to mind... _Question 1:_ Regarding the problem of mixing materials of different hardness in a bearing, some manufacturers like CeramicSpeed claim to treat the steel races in their bearings with some kind of coating that makes them harder or smoother so they wear better with the ceramic balls they use in their bearings. They often charge a premium price for this extra coating. How much can a coating really help? If coatings do provide significant help, how long do they last? _Question 2:_ Many properties of bearings were not discussed. For example, ball bearing quality is specified by roundness, smoothness, hardness and elasticity. It's commonly understood that ceramic ball bearings are usually much harder than steel. But what about the other properties? Is there a point at which a steel ball bearing is a better choice than ceramic because of these other properties? _Question 3:_ Some manufacturers like Shimano still make high-quality wheel hubs with cup and cone bearings. Why? What advantages do cup and cone bearings have in a wheel hub over cartridge bearings? Better lateral force handling? Would it be unwise to replace the steel ball bearings in a cup and cone hub bearing with ceramic ball bearings (since it's easier for ceramic balls to score the races if dirt gets in, thereby ruining the hubs)? Or would the benefits of ceramic ball bearings in a cup and cone hub bearing outweigh the disadvantages (assuming they're kept clean)?

[@peglor]

One of the reasons Shimano stay with cup and cone is because they do their own bearings and bearing seats (Cups and cones) AFAIK. If you manufacture in huge volume, it's possible to get similar performance at a lower price with cup and cone. Most hub manufacturers don't do enough volume for this, so by putting crappy unreliable bearings that spin smoothly enough to feel good in the shop and claiming their products are better because they have cartridge bearings, they can easily make a sale. Standard grooved cartridge bearings die very quickly if they have side loads or alignment issues because they're not engineered for them. At the high end, the likes of Hope and Chris King will engineer their own cartridge bearings and I suspect a lot of their work goes into making sure the bearings tolerate misalignment well. In fact Chris King hubs use angular contact bearings rather than grooved bearings AFAIK. Most off the shelf cartridge bearings (Especially in bike sizes) are built for machinery where loads are low and speeds are high rather than for bikes where car levels of torque are being applied, but at heading for 100 times lower rpm. Even a beautifully aligned hub/BB that's built to a competitive weight will flex enough under the pedalling/braking loads normal cyclists put through them. The genius of cup and cone bearings is that they realign themselves dynamically by running up and down the cones/cups as the bearing alignment changes, without self destructing. This can be seen by the way the wear line visible on the bearing cones when a cup and cone hub is dismantled is much wider than the contact patch of the bearing. The corollary to this however is that it's not cheap to make cup and cone bearings that are genuinely good. Basically in Shimano's MTB lineup, the only setup that lasts more than a couple of years (Or a little as a few months in the case of Deore hubs and below) without getting grindy is XTR, and it's all about the bearing material, surface finish and the hardening on the bearing races (Shimano's marketing blurb implies they're using a cubic boron nitride type coating on their cups and cones, but whatever they put on XTR it's literally 5+ times more durable than XT), combined with slightly better sealing. In fact anyone who wants their Shimano hubs to run better for longer could do a lot worse than spending the extra 2 or 3 Euro to get Durace/XTR bearings for their cheaper hub instead of just replacing with the same level of bearings the hub came with, or worse, a bag of random bike shop bearings the right size. The downside of cup and cone bearings is that when the cups are damaged the hub cannot be economically repaired, while you can keep feeding a cartridge bearing hub new bearings until the bearing seats are wallered out, which will take a while if good bearings and careful installation are used.

[@basstrom88]

There was a surprising lack of swearing in this video - I commend his restraint :D

[@mtnbikerva1]

How do you know 1/3 is grease? Just pack it in and that ends up being 1/3? Is there a easy way to do it/get it right?

[@Malte1878]

This is the day GCN went from good and fun to real! Wohoo finally Hambini...we all are not worthy

[@trabink2]

I've been following Hambini, happy to see you invited him... There are more tech gurus out there Jon! Great show!

[@useforstuffer]

That guy was fantastic! Best cycling video I have seen in ages. I am so sick of elementary school explanations. Thanks.

[@derekneumann]

Hambini's channel is great stuff!

[@gonetoearth007]

One of the best videos GCN has ever put together! And I've been watching for years. As an avid cyclist and bike builder I found this information very interesting and helpful. I never really considered the complexities of the motion and wear...always taken bearings for granted I guess. Thx guys!

[@joshe9286]

HA first thing I thought when I saw this video posted was "I'm not sure GCN would have much to add over the great stuff I learned from Hambini on bearings". Wha...look who it is! Kudos to GCN for going out and finding the best.

[@bbqreunie984]

HAMBINi realy is the master technique who can explain things quite simjple.

[@Wayfarer-Sailing]

Great to hear from such a knowledgeable guy!

[@jpiccari]

Amazing! Been waiting for this for a long time. One complaint is that it seemed GCN attempted to distance their sponsors from blame of hyping ceramic hybrid bearings.

[@clarkebynum4623]

Watching Hambini try is absolute best not to make any jokes about going both ways was more impressive than Kuss going up ALPE d'Huez

[@mathman0101]

Can we have Hanbini on again talking about various issues. Wheel and spoke fatigue, and bike aerodynamics including wheel aerodynamics what works and what does not. Hub servicing etc. The guy is a legend and very entertaining to boot.

[@roxic1212]

Hey!! Its great to see Hambini on GCN, he loves cycling and seems very smart. I enjoy his YT channel 👍

[@Jayneflakes]

Great video, thanks. I think that a GCN trip to Hambini's Lab/workshop should be undertaken.

[@bobbysilver272]

This guy never gets lost. He knows his bearings......Ok. Ok.

[@bicyclist2]

Good one.

[@sdqsdq6274]

ermm he sells them

[@Grizzly01]

@@sdqsdq6274 Come on mate, you can do better than that.

[@michaelvrbanac6923]

I might actually pay money to see the outtakes from making this video!

[@Longansrun]

He was so humble and informative in this video! Cheers GCN and Hambini! Very useful. Why can’t he be like that in his videos? Suppose that’s just his unique charm?!

[@ved.perkashsharma7453]

WHY.. DO YOU WANT HIM TO WORK FOR THE BBC..???

[@TheSueRitchie]

I loved the expression on Jon’s face when the load centre and logarithmic scale were explained - completely blinded by science! I am nerdy enough to now subscribe to hambini’s channel.

[@Hambini]

You didn't see the one that was cut!

[@peebee1357]

Hambini and no swearing, this melted my melon x

[@ovesimonsen5578]

You mix up cup and cone. Cone is all ways the inner part and the outer part (looking like a cup) is the cup.

[@markg4327]

I know the physical difference between cartridge and cup/cone, but what are the pros/cons of each type?For instance why does shimano always have cup cone in hubs and mostly everyone else go with cartridge ? Is there an advantage either way?

[@mangomanau]

I really dont know, but I think he was saying that cup and cone will take lateral loads better which would otherwise be bad on a cartridge bearing. Im guessing that while turning there could be lateral loads on the hub?

[@dfpguitar]

as an unqualified tinkerer I figured out that drag thing as a yoot by noticing that that MTB hubs would have massive amounts of drag as soon as putting the rubber seal on and that track hubs came with no seals at all.

[@neochrome24]

Amazing guest, really interesting

[@Medievalfan94]

Nice, got flashbacks to my first semester of technical emgineering xD It is so nice to hear a fellow engineer speak out on a topic thats his home playing field and knock out some of the myths flying around in the cycling community.

[@tquest1]

Vast majority of drag comes from the seal, has nothing to do with ceramic bearings..HEAR THAT CERAMICSPEED?!!!

[@rkan2]

The most efficient way to go fastest is to actually run counterfit bearings without seals and to change them for every race :D Not enough time for them to wear out!

[@rkan2]

CyclingSoreThumb Btw, in reality the pavement, e.g. the rocks are probably harder than train wheels which are metal. There are also full ceramic bearings, but they tend to be so brittle that they only work for "static rolling"

[@earthstick]

@@rkan2 On a hot day the roads where I live soften.

[@BLAKEISHart]

rkan2 no you get extra drag with fakes

[@rkan2]

Blake.is Sure, but the seals are still the main source for drag. Lower tolerance doesn't automatically mean worse drag, but usually leads to wearing out faster.

[@cyclingrawvideos9436]

"I don't even wash my bike" I replace it when it gets too dirty. When it's done it's done.

[@johngagnet1287]

So are angular contact cartridge bearings better on a bike than standard cartridge bearings? Seems like they would be for wheels at least.

[@dcv9460]

HAMBINI is AWESOME!!! 🤘🤘🤘

[@donaghgavin4722]

Hambini is the boss..love his channel..makes engineering entertaining

[@zrsgamboa]

Yay! Hambini!!! The bike nerd's nerd. Loving this informative GCN episode.

[@gcntech]

Thanks!

[@TheWaxChainFanClub]

I watched this upside down as my phone slipped out its holder when I was doing the dishes. I understood it just as much.

[@okantichrist]

Michael McDermott glad your phone didn’t go under

[@thehandleiwantedwasntavailable]

Great to see Hambini nerding out on super specific details of bearing types, codes, and race frequencies. But I couldn’t but notice that questions being asked were not actually being answered!

[@sixonesix9429]

Love Hambini. Super super knowledgeable and not afraid to say it how it is. Amazing engineering know how and love to watch him cut through industry bullshit.

[@whitemountainbiking902]

Great to see the engineering Guru Hambini sharing is knowledge. Good show, thanks guys. Well done.

[@manjican]

The 70 dislikes are coming from Bike industry elites. That's lookin at you Flo, Cervelo, Dan Richar, and etc.

[@captainvlog]

So I can’t use the park tool ploy grease in the bearings?

[@JohnDoe-zj6xf]

Always took bearings for granted. Never knew it was such complicated stuff

[@LepszyNizWczoraj]

I have your bottom bracket in my P5x - best thing I've bought to the bike. Those BBs should be factory fit in every pressfit frame ;)

[@nickrogers6441]

I've been following Hambini since the Llama brought him up in a video. Very interesting and informative .

[@rubo1964]

Got 20yr old Raleigh with good old square BB and still running smooth.I get the feeling bearings may last longer then you.... unless its contaminated or installed incorrectly.

[@Fetherko]

How do I decide if I want cartridge bearings or cup and cone bearings on my next set of wheels?

[@993mike]

Great video! I love the fact that he’s an advocate for replacing rather than continuingly regreasing older bearings. I’ve got a buddy who is so cheap he tries to get every last mile out of them, but you have to figure what your time is worth for a relatively low priced replacement item.

[@RonaldCHillberg]

cone on axle/crank, the cup on hub/bottom bracket. I've found the exterior bottom bracket outer races are very flexible. I suppose in honor of the weight gods, but if they get bent a little your bearing will be shot in a short time. I used to have my axle cones pit but not the cups. I think it has to do with the angle of the contact and the inside race has a tighter curve. This also makes larger bearings much more durable. It seems materials have improved from the 70s and it's not a problem anymore. I like the larger bottom brackets not so much for stiffness but better bearing durability. Good info.

[@cakeEATER17]

Hambone!!! My two favorite cycling shows joined, I can't believe it!!

[@WoodsMoose]

Guess I didn't quite understand the part about stainless steel presses and galling. Does it mean that - during the installation - the bearing will becomes stuck to the press surface so - when removing (unwinding) the press the bearing will be torn out with the press? Or will the "outer end" surface(s) of the bearing become damaged in any way. I mean - the press doesn't touch the "active" parts of the races nor the balls themselves. I have a Park Tool HHP-2 Bearing Cup Press which I have used many times on my road bike with "loose" BB30 (30x42x7) bearings and never noticed any galling.

[@rkan2]

Probably needs to be a really tight fit to actually cause significant issues.

[@ciap1]

Hambini actually said 'sram gxp' without swearing! Amazing!

[@Jose__Manuel]

Great Video, I hop you make a special video with Hambini about "BEST BOTTOM BRACKET"... Best regards.

[@michaellangston271]

Why aren't these frames made with added carbon in the bottom bracket id. So the final manufacturing procedure would be line boring or honing from the drive side, thru the assembly.

[@elviracatherinetalaoc2070]

The GCN should pay Hambini, by teaching them a simple Engineering 101.

[@reginaldscot165]

Finally! We have someone on GCN that speaks the truth!

[@ChuckD59]

Thank you for this refreshingly candid overview. Having engineering training myself, I'm glad you're not afraid to raise the technical bar occasionally.

[@alexisbueno2861]

In Colombia we mow our lawns with brush cutters that spin close to their 9000 rpm limit. You'd be surprised with the banging they can take. Actually, it's the grease against the seal that keeps the dirt out.

[@bphipps58]

one of the best gcn vids ever

[@gcntech]

Much appreciated Brian!

[@WiseGuyFTW]

I like numbers and this guy is brilliant. More videos like these would be fun.