Change to compact crank
05-13-10, 11:23 AM
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Change to compact crank
I currently have a standard Ultegra cranset (6600) and the bike has the corresponding Ultegra bottom bracket. I want to switch to an Ultegra compact crankset (6650), but it is unclear if I would need a new bottom bracket to accomodate a compact crankset. Does anyone know whether a new bottom bracket would be required?
05-13-10, 11:36 AM
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Both are hollowtech, correct? Should not require a BB change.
05-14-10, 06:32 PM
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05-14-10, 07:12 PM
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The bottom bracket (actually two outboard bearings) is the same for the 6600 and 6650. However, depending on the age/condition of the current BB, you might want to get a new bearing set. I just bought a Shimano 6600 outboard bearing set for $15 from:
https://www.competitivecyclist.com/ro...264.314.0.html
https://www.competitivecyclist.com/ro...264.314.0.html
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