Will a 9 speed shimano rear derrailleur work with a 10 sp cassette and shifters?

Question

Will a 9 speed shimano rear derrailleur work with a 10 sp cassette and shifters?

Answer 1

Yes, it will. The width is the same. The only difference is that the 10 speeds cogs are spaced closer to each other than the 9 speeds cogs. With proper adjustment to the 10 speed shifters, the 9 speed rear derailleur should work fine with a 10 speed rear.

Answer 2

ya it will work fine but it will not be the smoothest shifting.

Answer 3

yes but it will not ever be a super smooth quality shift....