I have fulcrum racing quattro road bike wheels. I'm changing my bearings quite often since I noticed that in general they last around 5000 km (over winter). I'm usualy using SKF 61903 bearings from local dealer, i even used NTN bearings they both lasted around the same.

I noticed that bearing of the drive side of the rear wheel gets worn out much quicker than on a non drive side. I'm wondering is this due to higher forces from chain or there is a humidity and rust problems.

What parameters of the bearings should I consider when buying new bicycle bearings? Don't just say buy ceramic bearings. I'm sure that helps them not to get rusted that much since only bearing race can get rusty but still..:D

I noticed there is multiple choices when it comes to bearings. I know there are ceramic bearings, ABEC 1-X and also double lipped bearings,.... anyone with some more experiences?

What parameters are you looking for when buying new bearings for bicycle wheels?

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    If you're wearing them out that fast be sure to look at dropout alignment. – Nathan Knutson Mar 4 '19 at 8:01
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    Thanks I will check. That might be the problem, but frame is made of carbon so there is nothing I can do about it I guess. Thanks for pointing this out. It's a new one for me :) – Greg Mar 4 '19 at 8:46
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    Re: ceramic bearings - these are great for industrial applications with very high rotation speeds, but the benefits for bicycle applications, where the rotation speed is relatively slow, are dubious at best. As for the drive side bearings wearing more quickly, I wonder if the seals on your hubs are less effective on this side? – John M Mar 4 '19 at 11:28
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    The design of the Fulcrum hubs puts most of the weight to drive side bearings. – ojs Mar 4 '19 at 11:37
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    Stupid question: Do you wash your bike, using a pressure hose? If so, don't! – Daniel R Hicks Mar 4 '19 at 13:02

I did however find this video with bearings explained. Very interesting:

So standard industrial bearings are best, there is a nice video on ceramic vs. steel bearings video:

Just in case someone is looking for same info.

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    Certainly interesting links but not really an answer. OJS's comment is probably the underlying cause, but further research on that design point could be expanded into a full answer. – Criggie Mar 4 '19 at 18:53

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