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Don't get BB's, trouble locating cranks for new build

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Don't get BB's, trouble locating cranks for new build

Old 09-14-11, 01:16 PM
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mastre
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Don't get BB's, trouble locating cranks for new build

I've got a new frame coming, got in on the Pedal Force CG2 group buy. It's a BB30 frame, and I've been looking around at what options there are. It's confused the hell out of me, to say the least.

Is BB30 just bearings and some clips/spacers that press-fit into the shell as in this ParkTool video https://www.youtube.com/watch?v=3hWVBX0OLzE ? Meaning, there is no shell, the frame acts as the shell? Is all I need then a BB30 kit like this one?
https://www.ebay.com/itm/SRAM-BB30-Be...-/400239310086
Can't even find the kit on SRAM's site, as a bonus the eBay item says it's provided in "TruVativ packaging" - win! Are they all one size? Are the different brands cross-compatible with cranks from other companies? Who else makes bearing kits? Can't find any on Chris King's site, for example. The ceramic version of the SRAM kit seems to include some type of green(?) lubricant, this budget TruVativ version doesn't. Where do I get it? Do these kits come with any instructions?

As for cranks, ideally I'd like a 52/36 but I can't find any in BB30. I'd even consider a 50/36, but SRAM doesn't even seem to sell rings in either 110/130 BCD in either of those tooth counts. Can't find them in FSA either. Is it supposed to be this hard?

Last edited by mastre; 09-14-11 at 01:22 PM.
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Old 09-14-11, 01:48 PM
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52/36 should be 110 BCD compact cranks. Many compact cranks are not available in retail packaging with 52/36 right now but I assume this will change within 1 year since several bikes from the big 4 brands now have them standard. You would then have to buy the rings separately and for SRAM (as an example) this will cost you around $100.

Those are the bearings you need. Check the crankset you are buying to see if it includes BB30 pressfit bearings or not.
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Old 09-14-11, 07:35 PM
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Originally Posted by mastre View Post
As for cranks, ideally I'd like a 52/36 but I can't find any in BB30.
You do realise that many, many people do not run BB30 cranks in BB30 frames, preferring instead to use one of the (at least) three possible adaptor systems? Using an adaptor opens up a whole world of crank options.
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Old 09-19-11, 10:42 AM
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Been doing more reading which cleared up a lot of things. I ordered a used SRAM BB30 crankset off fleabay which includes used ceramic BBs. Question: where can I find replacement c-clips, seals, spacers, etc.? I want to only reuse the BBs and replace everything else, but can't seem to find them anywhere. Also the SRAM-supplied syringe with green/blue paste (something like Loctite I assume?) as seen here:
https://www.ebay.com/itm/SRAM-BB30-Ce...-/140603043556
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Old 09-19-11, 11:00 AM
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the syringe is packed with grease to periodically lubricate the tru-vativ supplied bearings. honestly, the best thing about bb30 is the ability to purchase bearings off the shelf for about 8 bucks. You need two 61806-2RS deep groove ball bearings.
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Old 09-19-11, 11:09 AM
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I would suggest using a BB30 adapter. I have had lots of problems with my BB30. Bearings make noise and don't seem to last more that 3,000 miles.... and they are expensive. and they require special tools to work on or you have to pay a shop. Not cheap and not worth the headache. Adapter and a standard crank.

I got the Pedal Force QS3 a year and a half ago. Great bike, just hate BB30.
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Old 09-19-11, 11:43 AM
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Like I said I already purchased a BB30 system. I'm going with it, I've read user reviews and it seems to be split, some people have no problems, others have tons of problems. I pay meticulous attention to detail and am building the whole bike myself. I enjoy testing out new technology, if it doesn't work for me I'll go to something else next. This is my BB30-from-scratch project. Worst case scenario, steel BB30 bearings are about $40 as a kit, once you have the proper tools looks pretty straight-forward to service (I've seen videos from Park Tool), I'm okay with $40 every 3000 miles although I seriously doubt it'll be that often for me - outside of rainy season, for which I have a separate bike, South Florida roads are pretty decent. This will be my 3rd bike and I plan to rotate, 3000 miles on this bike won't come in less than 3-4 years.

My question is, do I have to buy an entire steel bearing kit from SRAM just for replacement C-clips, seals and whatnot? As noted in my original post, the cheaper non-ceramic kits also don't seem to include the syringe with grease/loctite - I would like to find out what SRAM ships with the ceramic kit and how I can get it separately. Where can I purchase these items to use with the ceramic BBs I have coming? For all I know the used clips and seals will be in decent shape, but it seems smart to replace "consumables" when doing the BB install - the bearings are the expensive parts, the clips/seals costs pennies to manufacture.
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Old 09-19-11, 12:17 PM
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I've referenced this document
https://www.sram.com/sites/default/fi...15-002-000.pdf
I'm basically looking for these parts:
Wave washer (1, non-drive side)
Spacers (3? non-drive side)
Bearing Shield (2, one for each side)
Retaining clip ("c-clip", 2, one for each side)

They mention "grease", what kind of grease has been found to work best? In numerous other threads I've seen people mention applying Loctite 640 (and, separately, 641) on the outer BB shell to eliminate creaking.
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Old 09-19-11, 12:18 PM
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The $40.00 Sram kit i just had to buy came with bearings, lock rings and plastic washers.

Hope the BB30 works for you.
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Old 09-19-11, 04:46 PM
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What I would do is buy a regular BB30 kit from SRAM and when the time comes to replace the bearings just order a set of bearings. I believe that they are 6806 bearings. Then if you want you can replace them with ceramic's without buying the whole kit for a lot less. No need to replace the c-clips, etc... unless they get damaged.
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Old 09-19-11, 06:32 PM
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Alright I guess I'll wait to see what condition the stuff that comes with the crank and ceramic BBs is in. I found this:
https://www.amazon.com/SRAM-PitStop-c...dp/B001CJZ2CO/
Looks like the one in the kit, very tricky description: Road version is designed for road derailleur pulleys, while MTB formula is for GXP bottom brackets (road and mtn) and mountain derailleur pulleys. This is the "MTB" formula, which apparently is what's used in Road and MTB Bottom Brackets. They only mention GXP but that's probably because BB30 is too new and product literature usually runs years behind?

I found non-SRAM clips:
https://www.ebay.com/itm/Cannondale-S...-/370540975683
These should work, but I'd like new seals, wave washer, etc. Should I just call SRAM?
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Old 09-19-11, 07:07 PM
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Try a LBS that sells Cannondale or Specialized for the small parts.

Or this: https://aebike.com/product-list/fsa-f...8-m15617-qc30/
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Old 09-19-11, 08:17 PM
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in lots of 1-100, you can get these bearings for $0.83
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Old 09-20-11, 04:55 AM
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Groupbuy? JK
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