Cannondale Hollowgram / BB30a compatibility

Discuss light weight issues concerning road bikes & parts.
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caballero
Posts: 564
Joined: Fri Jun 16, 2006 11:00 am
Location: Japan / US / Australia

by caballero

Are the older silver hollowgram Si cranks compatible with the newer BB30a standard ?

Seems like I just need a 109mm spindle and appropriate spacers/washers etc... is that right ?

I’d prefer to have a set of silver ones rather than the newer black ones.

Thanks !
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by Weenie


maquisard
Posts: 2058
Joined: Thu May 01, 2008 8:51 pm
Location: France

by maquisard

The 'pitch' of the non-drive side crank arms needs to be different to maintain the same Q-factor when changing axle length, a BB30A and BB30 non-drive side crank arm are different. So if you take a BB30 crankset and use with a BB30A axle the Q-factor will be different on the non-drive side as the pedal will effectively move further away from the centre line of the bike.

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