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Old 07-20-10, 12:24 PM   #1
dshack
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6500/6600 FD Compatibility

Would a FD-6600 (double) work in place of a FD-6500 (double)? The 6600 is a 10 speed and the 6500 is 9. All other components would be 6500. Thanks!
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Old 07-20-10, 03:43 PM   #2
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It will work. I believe the cage of the 6600 is slightly narrower, which means you might get chainrub with the 6600 when you wouldn't with the 6500. Does your front shifter have a trim position for the inner chaining? If so, then the trim might allow to use all the cogs in back with the inner chainring. You may lose the use of an extra cog with your outer chainring, but you should only use that chainring for the smallest cogs anyway.
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Old 07-20-10, 08:16 PM   #3
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Thanks for the reply! I decided to buy a used FD-6500 from a user here on BikeForums. As cheap as the derailleurs are, it's not worth having any compatibility issues. So, anyone needing a FD-6600 w/ a 31.8 clamp, let me know!
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Old 07-20-10, 11:06 PM   #4
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Quote:
Originally Posted by dshack View Post
Thanks for the reply! I decided to buy a used FD-6500 from a user here on BikeForums. As cheap as the derailleurs are, it's not worth having any compatibility issues. So, anyone needing a FD-6600 w/ a 31.8 clamp, let me know!
Good call.
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Old 07-21-10, 02:12 PM   #5
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JiveTurkey is right. The derailleurs are a slightly different shape and width. Theoretically, if you lined up both derailleurs in an identical way, you'd get more rub in cross-chained gears. That said, the difference is so small that even a fraction of a mm in cable adjustment will render the difference negligible.

I agree that when the price is low enough, I'd get the correct version just to give myself piece-of-mind, because the differences are not just in the width. The newer iterations are almost always machined and shaped in a more advanced way.
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