I have a 2011 cannondale supersix with FSA Gossamer cranks. I would like to upgrade to Hollowgram SLs. I have the cranks in hand already but I have been told that I need a cannondale bottom bracket. Is this accurate? The FSA bottom bracket will not be compatible with the new cranks?
If your Gossamer is the BB30 version, you can use the same circlips, bearings, bearing shields, wave washer, and spacers as your FSA crankset. Those parts are the same. Ideally, you will only need the Hollowgram crankset with bolts and a 104mm spindle (QC612).