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I have a 2007 Cannondale Synapse SL 1. The bike came with Cannondale’s Carbon Compact SI crankset. The 2008 model comes with Cannondale’s Carbon Compact BB30 crankset. Is there any difference between the two cranksets or are they the same just with different names? I read somewhere that the latter was the case, just a name change. Thanks.
 

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bb30 is an open specification for a larger bottom bracket developed by
c-dale in 2000 and subsequently 'opened' for others to use.

see: http://www.bb30standard.com/

in theory, it should be better than the current external bearing designs
because it reduces Q(the distance from pedal to pedal across the BB)
and with larger bearings and spindle(and correspondingly larger BB shell),
gives a stiffer, more durable BB/crank.

other than the reduced Q-factor, there shouldn't be much difference
between the old and new.
 

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you should ask this in the Cannondale forum - but to answer your question - they are the same. The only running change that was made was going from a 3 piece crank to a 2 piece later on. Neither of which are extremely durable. The more powerful or higher mileage riders or those doing a lot of hills at low cadence are having problems with the carbon crank arms rotating on the metal parts.
 
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