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outboard bearing BB is not lasting long?

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outboard bearing BB is not lasting long?

Old 12-15-10, 01:12 AM
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outboard bearing BB is not lasting long?

It is my first winter on outboard bearing BB, I bought it new 5 month ago. Today I've noticed that crankset is rocking around when I'm mashing uphill. Not much, but noticeable - maybe 0.5mil on the end of crank arm.
Is it normal to wear off the outboard bb in less than half a year? If not - what might be wrong?
Shimano outboard BB, RaceFace Cadence cranks. Fixed, commuting every day 25km in nasty Vancouver weather.
Thanks,
-Igor.

Last edited by dikman; 12-15-10 at 01:25 AM.
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Old 12-15-10, 01:24 AM
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is it installed properly? bolts holding the spindle together loose?

i would be surprized if your shimano bearings are worn out in just 5 months even in vancouver if everything's installed properly and torqued to spec.
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Old 12-15-10, 01:30 AM
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Originally Posted by cc700
is it installed properly? bolts holding the spindle together loose?
Everything was tight when I put it together. I do not have a torque wrench, but all bolts and BBs were tight. It took me some effort today to disassemble it. Maybe it was too tight?
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Old 12-15-10, 01:42 AM
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if it was like, he man giving it all he got tight, then you could have possibly damaged the spline interface or the bearings, either of which could result in a wobbling crank arm after a relatively short amount of time.

a lot of these cranks and external bbs have very specific torque specs, and it's because they are relatively simple designs that need to be within spec to work properly.
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Old 12-15-10, 06:50 AM
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from my experience, external BBs are stiffer and lighter than traditional BBs but wear out faster. no surprise, seems like a lot of the sram gxp BBs are made of some sort of plastic and not metal. maybe it's a conspiracy to keep customers coming back for replacements every year.
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Old 12-15-10, 07:01 AM
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Outboard bearings wear out faster. 5 mos seems a bit short, but not by much, especially in regular nasty weather. Roadies riding regularly in decent weather go through bearing in a year.

If you really think it an issue, see if the vendor who sold you the bb will see if shimano will warranty it.

If you ask shimano, they'd probably tell you the issue could be using a shimano bb with non-shimano crank. Shimano's bi into system integration, donchaknow.
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Old 12-15-10, 08:47 AM
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external bb longevity is also dependent on the bottom bracket shell. if the two faces are not perfectly parallel, the bearings will wear prematurely...how fast depends on how misaligned. get it faced, if in doubt.
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Old 12-15-10, 10:11 AM
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You know, I've been told since day 1 that External BB's (especially those supplied with the SRAM GXP) will die out in under 1000 miles, but I am on my way to 2000 miles on the same old same old SRAM S300.1 stock BB, with no issues. There was even a 5 month span where I didn't do any maintenance at all. But this is considering one of my old regular paths was kitty litter, and most of my riding is done on the road, with probably only 200 miles, if that, being through rain. The only issue I have had was wearing out one of the seals because I thought it was a good idea to put a spacer between one of the cups and the BB shell to move my chainline (that didn't work for simple, stupid reasons).

Anyways, I haven't gotten crap in my BB yet, hopefully I won't anytime soon (knock on wood).
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Old 12-15-10, 12:30 PM
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people swing on bb30s nuts, but its even worse.
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Old 12-15-10, 12:54 PM
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^I call shenanigans. I've raced 2 seasons of cross on a BB30 frame with little to no maintenance. I pull the cranks out every month or so and you could preform surgery in there. 2 out of the 14 bikes I own have BB30 and I need to maintain these far less that any other type of BB in my fleet.
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Old 12-15-10, 01:14 PM
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congratulations, youre one of the few installing them properly.
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Old 12-15-10, 01:30 PM
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Like others have said, having parallel BB faces is crucial -- get your BB shell faced.

And if your cranks have preload adjustment and pinch bolts (like Shimano), careful with that preload adjustment.

And if your cranks are like Sram, with just one bolt, where the NDS crank bottoms out on the spindle, pay attention to your torque specs and also make sure your BB shell is the correct width (this is taken care of with a facing, which you should have done by now).
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Old 12-15-10, 01:44 PM
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Originally Posted by adriano
congratulations, youre one of the few installing them properly.
So its not the BB30 interface, nor is it the brackets on the market, but the installers fault? Thats sure not what your first post said.
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Old 12-15-10, 01:44 PM
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IDK. I have a Shimano Dura Ace 7800 Crankset and BB on my roadie, and have had no problems in 6 years and 12000 miles of use in dirty and rainy conditions. It was installed by the lbs who built the bike and I remove the cranks annually for cleaning. The bearings are original, very smooth with no play. I follow the Shimano instructions on preload and pinch bolt tightening when I reinstall the cranks.
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Old 12-15-10, 03:30 PM
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more precisely, i should say that hes in the majority managing to have it work well, but there is certainly a higher frequency of issues compared to internal and even external set ups. bb30 is more finicky and temperamental, and while there are definitely shoddy installations, many are doing things to the letter and having a poor go of it.
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Old 12-15-10, 09:32 PM
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Originally Posted by TejanoTrackie
IDK. I have a Shimano Dura Ace 7800 Crankset and BB on my roadie, and have had no problems in 6 years and 12000 miles of use in dirty and rainy conditions. It was installed by the lbs who built the bike and I remove the cranks annually for cleaning. The bearings are original, very smooth with no play. I follow the Shimano instructions on preload and pinch bolt tightening when I reinstall the cranks.
same story here, campy ultra-torque flavor. faced BB, professional install with accurate torque wrenches. at least 3yr/10k miles in generally good conditions. zero issues. disassembled for maintenance once.
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