Thread: BB Swapping
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Old 08-19-10 | 03:51 PM
  #2  
badamsjr
17yrold in 64yrold body
 
Joined: May 2010
Posts: 922
Likes: 1
From: Northern CA
IF the XT is set up for 73mm BB shell, and IF the Ultegra is set up for 68mm shell, you will need 5mm less shims. 73mm is what a lot of MTB's are set up with, and 68mm is what most Road English BB's are set up for.
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