Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
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Are both BB shells the same width?
IF both bikes have the same dropout spacing, just swap the BB's with the crank.
That would "probably" still work if they don't have the same spacing, but not give an ideal chain line.
Else, you could just install the crank and see where it ends up.
Else, you could remove both BB's and read the size.
You might mention WHAT bikes you have to see if there are any interchangeability issues such as ISO vs JIS, Bracket width etc.
With the FDERs-
You might be able to use the existing setup.
It depends on how much travel the FDER has, how it's "centered" over the triple (spindle length) and what's the size difference between the before/after rings.
Provide more details with what you have.
Last edited by Bill Kapaun; 02-16-12 at 05:52 PM.