Product Overview
The Shimano Zee RD-M640 Rear Derailleur DH (Downhill) version can accommodate up to a 28T cassette while the FR (Freeride) version can accommodate up to a 36T cassette.
The Shimano Zee RD-M640 Rear Derailleur DH (Downhill) version can accommodate up to a 28T cassette while the FR (Freeride) version can accommodate up to a 36T cassette.
