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Old 05-13-10, 11:23 AM   #1
Dominae
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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?
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Old 05-13-10, 11:36 AM   #2
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Both are hollowtech, correct? Should not require a BB change.
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Old 05-13-10, 11:46 AM   #3
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Yes, both are Hollowtech.
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Old 05-14-10, 06:32 PM   #4
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Quote:
Originally Posted by Dominae View Post
Yes, both are Hollowtech.
you will have to shorten your chain and seriously move the front derailleur. I did this and learned all about adjusting front DA derailleur in the process.
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Old 05-14-10, 07:12 PM   #5
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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:
http://www.competitivecyclist.com/ro...264.314.0.html
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