When replacing pivot bearings I'm often staggered by how hard it is. I mean, this isn't a one-off, unforeseen event like gluing together a cracked carbon frame: it's routine maintenance. If you live somewhere muddy and you ride a lot you might have to do it once or twice a year. That puts it in the same category as a proper suspension service. But suspension manufacturers design their products to be relatively easy to service. It usually requires nothing more sophisticated than a pair of snap ring pliers, and they provide comprehensive and detailed instructions with lists of required tools, plus service centers for those who'd rather pay someone else to do it. Frame pivot servicing isn't so simple.
Instructions are hard to find at best, but usually non-existent. Even working out which bearings you need can be tricky. Proper tools like bearing-pullers, presses and rocket tools are expensive, hard to find, and they often don't fit into the devilishly recessed nook you're trying pull a bearing from anyway. Many bike shops won't replace them for you at any price because they know how frustrating and unpredictable the job can be.
It seems to me suspension pivots are not typically designed with ease of servicing in mind. I often end up resorting to great leaps of forced ingenuity with sockets, hammers, drifts, vices, threaded bars, heat guns and penetrating oil. Although I've done it dozens of times now, I still have trouble getting the bearings out or pressing the new ones in square. And while it sometimes goes smoothly, and I always get the job done somehow, it seems unreasonably difficult for such a common task.
Is it just me?
You know. An unicorn. Like the one in my bike room.
My neighbour lady wanted a light bike (we have 7, 8 steps from our bike room to the street level) that is also comfortable so in the bike shop they sold her a carbon xtr equipped Scott Spark
The biking is amazing up there but I gladly moved back to the desert. All that loam and greenery comes from somewhere!
Used a few times before lockdown.
It is strictly prohibited to build the uplifts and the downlifts at the same side of the mountain.
Anyway, I am midway through pulling 12 bearings out of my Transition Patrol which I bought second hand last August. Damn the main pivot bearings were shot, manky as hell and way past due a change. Going to finish up the task tomorrow between watching the Vallnord DH.
Clean every metal to metal contact in the entire linkage system thoroughly. Grease lightly each contact and under all bolt heads. Check threads for lock tight , Reassemble- torque to spec, go ride creek free.
Its a pain is the ass but should solve the issue
The biggest factor in bearing life is big balls, good seals and frame alignment. I believe the new Commencal uses double-row bearings on the main pivot, which is real smart if you ask me.
EDIT: And then there is Orange bikes...
Guess I have to retract my smart ass ignorant remark now.
If the fist punches the face its not the foots fault is it?
I was joking :-)
ETA: in Covid times, up those to 3 and 6 respectively.
I'm also a part time watchmaker and trust me finding a missing bike part is a walk in the park compared to finding that 2mm long screw or impossiblly small spring that has pinged of the work bench and onto the floor.
Top tip I use for removing circlips from brushless motor shafts - do it inside a freezer bag for easy retrieval.
1. brake caliper spacer
2. brake lever bleed plug
3. hex key I put down when looking for said plug
4. steerer tube spacer....wait a minute why is one missing....shit remove stem, remoce fork, catch all spacers and bearing .....
5. fork lowers whiper spring thingy ( how the hell it came off and not be on the stansion I will never know...only noticed after filling with oil obviously....
6. gasket on the damper knob on a RS Revelation...just put the old one back on....who knows when I will find that one....
That is like a month of dropping things in a day....thanks PB I am blaming you...
No.
Or rather he'll and f*ck no.
Age 12-18 I used to press bearings out and carefully remove the shields, clean them with gasoline and brake cleaner and repack wheel and suspension bearings. Doing them in situ will never ever get all the old dirty gritty grease out. But pressing them out via the inner race is also less than ideal.
Age 18-22 I nerded about types of greases, using aluminum complex ep greases for suspension pivots and low temp lithium greases with light base oils for wheel bearings.
22-30 I nerded out on bearing designs. Enduro is China trash. Prying on shields now matter how careful is not ideal, unless you've got snap ring shields.
For 8 or 10 bucks I knock out a wheel hearing toss it in the trash and put in a nice japanese NTN with LLB shields marvelously low friction jobs.
Suspension pivots are truly no place for bearings, bushings belong here. Bearings while touted as superior are actually a shortcut, and the partial rotation simply trenches the races, no reason to grease a bearing with wrecked races. Straight in the trash with them after 6 or 8 months.....
And unfortunately enduro are the only game in town for some of the small full compliment (all balls no cage) bearings selected for mtb suspension.
I think Rocky started using bushings in their newer model Altitudes to provide automated grease injection. It's only on the top linkages. Otherwise, all the other linkages are bearings. Kind of gimmicky since if the grease gets contaminated with grit, it will destroy the bushings. Then, you're left with loose linkages over time.
If you are riding a bike hard enough and often enough, its a great idea to occasionally clean your pivots and spin the bearings a few rotations so at least you are roaching a different area of the race diameter.
Don’t trust Specialized back in the 90s they said their steerer tubes “didn’t need to be lager than one inch, and will not be changing.” Back then everyone except Cannondale had moved to 1 1/8” and Cannondale was using 1 1/4” and look where we are now.
Yes bearings perhaps move 10 degrees on pivots. So if you rotate the bearing 90 degrees the bearings sit on the fresh non worn race.
What is this article about? Bearings being an absolute pain in the ass to remove from some frames. In that circumstance ripped off the seal push in fresh grease . Slap the seal back on and have the pleasure of riding your bike.
Adding grease to a contaminated bearing is just makes a contaminated bearing with more grease and a compromised seal.....
Oh wait it will
And
What happens when it does.
Oh it gets crunchy and rusts.
Why would you think the bearings speed has anything to do with moisture ingress?
Ps your wheel bearings spin hundreds of rpm not thousands and water and grit does number on them.
I've had plenty of enduro pivot bearings that lasted less than 6 month and can not be turned by hand. Not even a few degrees.
This is with an unmolested shield on bikes that I don't really wash with a hose because water ruins shit. Yep adding grease will fix a locked solid bearing....
Uhmmm nope.
Maybe if you could add grease in a Manner that flushes the bearing from one side to the other, what you say would hold true, but with most any bearing that's controlling any axial movement one shield is blocked, so all your gonna do is pile lube on top of trash.
As I said above, I regularly put fresh grease into my bearings, as @DHhack says I also 'overpack' them, because that helps prevent ingress of water (which as you said, results in rust). Regular repacking keeps them fresh, I consider it essential preventative maintenance.
I've brought seized bearings 'back to life' by flushing them out with brake cleaner and forcing them to spin until they move freely, blowing all the rusty crud out with compressed air and then repacking with grease. It's not perfect and I am well aware that the bearings and races are still worn, but at least they rotate smoothly and it's a good short term fix.
I do like a bike with as few different bearing sizes as possible. My Trek seems to have a different bearing for every freaking position. On my Norco Optic it's the one bearing for everything. This makes buying bearings sooo much easier.
My Giant Reign bearing kit came with new hardware as well, the old shaft and spacers were excellent removal and installation tools.
"Popping seals on bearings without removing, cleaning and re-greasing in place the best you can, and hoping that buys you some more time/fixes that weird noise"
"Uneasily awaiting signs that the inevitable first pivot bearing replacement is finally needed"?
"Pivot bearings need to be replaced, its time for a new frame"
Like literally, right now at 5am I could go and buy bearings and have them on my bike before the sun is up. Bike shop isn't even open for 5 more hours. Bearing suppliers have stock on hand. You could walk in with a handful of bearings, and drop them on the counter and they can measure for you if you don't have measuring tools. And it will be cheaper.
But.
Pressing and extracting steel bearings into aluminum sockets, gradually deforms the aluminum part. Even if you use a proper tool, there will came the time were the bearing will start “working” the socket surface…
For that price range, I would like to see some steel sleeves into the aluminum parts. The weight penalty would be… almost nothing and the part will live up to more bearing changes.
This might sound like a generalization, but consider this: High end bikes, seem to be more expensive every year. At the same time ‘these” bikes seem to last less & less.
We seem to forget that good engineering also means that your machine will work flawlessly for a longer period than a “cheaper” one. It will be easy to service.
In other words, less time with the wrench, more in the trail!
It made the job incredibly easy and actually therapeutic but then what grinds my gears is when frame manufacturers have two different types of bearing seats.
My 2020 Sight i was able to use the RRP puller for all but two bearings (Upper swingarm linkage) which need to be pulled out, rather than push (like the RRP can do) and now had to fork out another few $$ for the expanding style puller as there are two bearing, back to back but have a back-to-back double bearing setup, separated by a machined lip -so you cant push either bearing..
The Axle pivot has a double bearing setup also but has an inner seat so both can be pressed out...
Why not just use the same setup here too..
"I tried once to replace my bearings but never succeeded to remove the old ones so I gave up and felt into shameful procrastination".
Meanwhile, I love to ride my faithfull hardtail
Vpp/ks link etc are superior designs since no bearings on the chainstay/seatstays, and bearings could be larger, etc
If on the other hand, you don`t thrust anyone to wrench on your bikes or, you happen to live on remote island, with no LBS but still found a way to justify yourself a FS bike instead of the far more logical choice of a HT, prepare to spend money on the right tools for the job, otherwise you will certainly regret not going for the HT.
Just earlier today I was servicing an 08 Kona Dawg and looking up the details brought me to pretty much the same discussion from 13 years ago. The consensus I think was that Kona stopped providing such information for liability reasons, I wonder what's behind that. Honestly that sounds outrageous to me, but I'm not from north america and I'm learning that "liability" is now running this place
Living in the PNW I have to replace my bearings twice a season. Most of my previous bikes just developed a little play to let you know, but for some reason my Scott Ransom likes to start creaking the minute any one of the 8 bearings is loose.
My biggest annoyance is there is a bearing crush sleeve in the main pivot that I'm not clear on what the proper procedure is for it becaue its ID is bigger than what fits through the bearings, so you cannot index it while pressing the bearings in. I have to reach up and hold with one hand while trying to do the final press and its always a cluster fuzz getting it lined up.
I've been meaning to try those new gel impregnated bearings (www.skf-mtrx.de/en/product-details) that were featured on PinkBIke last year, but I can only find them from an international supplier and by the time they get here I'd be out $80 so I haven't given them a shot yet.
Bike companies and designers are also responsible. If you don’t list the bearings required right there on your website, then I hate you. It’s not hard to do - look at Orbea’s blue papers. Also designs with a hundred different bearing sizes - I recently had a Lapierre and a Rose through the workshop that were a chore, whereas for example Evil have lots of bearings but they’re literally all the same size other than the main pivot. I shouldn’t have to pull your bike apart and remove the old bearings in order to size them up and order replacements to finish the job.
Mine look like they might need replacing at the end of the season/sometime this year. And the only place I know to check is the manufacturers "bearing kit". Which, I'm sure that would work, but what are other good places to look for them?
Would be open to both better quality bearings... or the same quality as the Kona kit, but cheaper
Thanks for the feedback team.
I'm in the US, and I just noticed last week that I was getting some noise when compressing/pumping the bike (that I can finally hear because of the new hub... yay onyx?).
I popped the seals and cleaned/re-greased the bearings the best I could while they were in place. Most of the of the pivot bearings were somewhere between "maybe a touch gritty" and "ok, that one was definitely notchy". After the re-grease they're a bit better across the board, but maybe not back to 100%.
So a replacement is coming sooner rather than later.
However, I forgot to take down the part numbers when it was apart. So looks like I'll have to take notes next time I get the pivots apart.
I spend ~$100 a year on frame bearings for one bike (not a SC). On top of that, the first time I needed to replace them, I spent at least an hour nailing down the list of the bearings I needed and then an additional hour or so figuring out where I could order them from without paying shipping to three different suppliers (nobody ever seems to have all of them).
When I replace bearings on one of my girlfriend's Julianas, the process is much different. I just say "I'm going to tear down your bike. Order bearings in case I need to replace any of them." About five minutes later, they're on order (for free) and I tell myself I need a SC.
It can be frustrating when there are uneven lips or surfaces immediately surrounding the bearing orifices'. That makes it a pain.
And other than a bearing puller for blind holes, you can usually get by with some threadrod/long bolt and some good washers, nuts and sockets of the appropriate size.
I voted "I never find it too hard [hopefully that's the case when performing in future]."
Sram definitely need to come with idea of universal bearings size such as 19,98 or so
thus, i stand corrected. ironically, i never actually used any on my own bike. just heard f/a friend that it works well for the purpose - turns out he was wrong. next time i'll fact check so conjecture doesn't lead to such gross misinformation in this hallowed platform of truth.
and, for the record, i already knew WD-40 displaces water, so never mentioned rinsing any cartridge bearing surfaces after using it. also, based on my experience, Simple Green works just fine for cleaning bike chains & other parts made w/steel. once again, YMMV...
that is all.
If you pull your frame apart before bearings are totally thrashed and seized, use a razor blade to gently pop off outer cartridge bearing cover, apply wd40 or liquid wrench, rotate, scrub and blow out with air hose, then pack full of fresh grease, reinstall bearinf cover and reassemble frame you can achieve same result as new bearings with less effort and no cost.
"Many bike shops won't replace them for you at any price because they know how frustrating and unpredictable the job can be."
I bring my mechanic whiskey because he is a friend and i like to drink with him. I take it you don't have friends
Major props for the Uber- obscure reference! ; )
Uhhh... Who told you you were watching Big Trouble in Little China?
That is, in fact, a ‘Fletch’ reference.
Personally, I charge all my fresh bearings to Mr. Underhill’s AmEx card... Want the number?
It’s all in the reflexes.