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Discussion Starter · #1 ·
I have a Trek 1500 with Shimano 105 9-speed from 2006. My current crank is the stock Ultegra double, not sure of the actual model number though there's a sticker on it that says 'Octalink' but I was wondering are 10-spd cranks compatible with 9spd derailleurs?

EDIT: I found where is says the model number, my current crank is FC-6500.
 
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