Best BB386 : GXP bottom bracket ?

Discuss light weight issues concerning road bikes & parts.
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Beaver
Posts: 501
Joined: Wed Aug 18, 2004 6:06 pm
Location: Lower Saxony - Germany

by Beaver

How much does the C-Bear weigh?

The Sram Red BB386 "Quarq ready" w/o chainrings is ~485g, the GXP ~415g, so it shouldn't be more than 150g or the BB386 would be the better choice. ;)

But I hope it's not that heavy, also it looks quite solid and people state that it really is indeed a no brainer.

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User avatar
Beaver
Posts: 501
Joined: Wed Aug 18, 2004 6:06 pm
Location: Lower Saxony - Germany

by Beaver

After trying the C-Bear, I had to replace it because of creaking noise under load. Weight was 110g (without washer and spacers), next try is Wheels MFG threaded with 140g.

That one spins really well - with BB386/GXP adapters the crank couldn't spin a full round without (!) the chain on, with C-Bear it was ok, as seen here:

https://www.youtube.com/watch?v=VJ2_jmF2UWw

But weightwise I am now close to the BB386 RED Quarq ready crank - with glued in press-fit cups this should also be creak free...

by Weenie


Hexsense
Posts: 563
Joined: Wed Dec 30, 2015 12:41 am

by Hexsense

Two choices in my mind.

Wheelsmfg thread together : https://wheelsmfg.com/bottom-brackets/b ... black.html
This ensure bearing alignment and tightness regardless of frame bb tolerence. Which could solve the problem.
Token has similar thread together, however their bb386 GXP bb use bb30 bearing with diameter reducer so it's not really a native gxp system.

BBinfinite: https://www.bbinfinite.com/products/bb3 ... ectfit-gxp
One piece BB push from left to right, not only it ensure bearing alignment but also stiffen the bottom bracket. Also weight less but cost more.
From a snap shot from Hambini's video at 12:43, his test suggests that both BBinfinite and his one piece bottom bracket increase overall stiffness.
https://youtu.be/1XXrVoF2TwY?t=12m43s
However, Hambini don't really like GXP standard, while BBinfinite loves it.
https://www.youtube.com/watch?v=n1yysS0GnbQ

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