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Discussion Starter · #1 ·
I want to swap in a compact crankset on my GF's bike. It has Shimano 105 components on it and is about 9 years old. I'll probably buy something on special or from ebay. What kind of bottom bracket interface do I need on the cranks?

I've been looking at the FSA cranks that have the ISIS mount but I could use anything.

Should I just upgrade the bottom braket too?

Thanks
 

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There are several bb types. Your best bet is to get a new bb to match whatever new crank you choose. There no reason to limit your crank choices to just one bb.
 
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