Shimano front der. compatibilty- 9/10 sp?

[laura*]

The front derailleur doesn't really care how many speeds the rear cassette has, within reason. 9 or 10 speed doesn't matter to the front derailleur, for road use.

As chains started getting narrower, 8 to 9 to 10 speed, the front derailleur's cage also got narrower. This means the 9 speed 6500 might shift a bit worse than a 10 speed derailleur. In particular, it might be hard to tune it to handle both upshifts from small (front) - smallish (rear), and downshifts from big (front) - biggish (rear). That's because the business side (the side that will do the pushing) of the cage will be a little farther from the chain.

So I would say, as long as that front derailleur physically fits ... it should work fine as long as it is installed and adjusted properly.

It is definitely worth a try!