I just set up a ten speed system on my bike using a mix of 9 speed and 10 speed parts. Since there is a lot of confusing and contradictory information about Shimano dyna sys 10 speed, I thought I would post up some compatability issues I have found.
1. Road 10 speed derailleurs and shifters are completely incompatible with mountain (dyna sys) 10 speed derailleurs and shifters. The cable pull by the shifters is different for both front and rear.
2. Nine speed rear derailleurs will not work with 10 speed mountain rear shifters. They will however work with road “flat bar” 10 speed rear shifters. Dyna speed shifters pull twice as much cable per shift as 9 speed shifters, so if you use a 9 speed derailleur it shifts two gears for every one push.
3. Dyna sys 10 speed rear derailleurs cannot be used with 9 speed shifters. Road 10 speed derailleurs can be used with 9 speed shifters.
4. Nine speed front derailleurs can be used with 10 speed front shifters, but do not work optimally if used with a 10 speed crankset. Nine speed front derailleurs and cranksets can be used with 10 speed chains and front shifters. A nine speed shifter can be used to shift a 10 speed dyna sys front derailleur.
5. 10 speed road chains are different from 10 speed mountain (dyna sys) chains. The dyna sys chain is a directional chain that is made to shift better with 10 speed mountain drivetrains.
6. 10 speed road cassettes and 10 speed mountain cassette use the same sprocket spacing.
1. Road 10 speed derailleurs and shifters are completely incompatible with mountain (dyna sys) 10 speed derailleurs and shifters. The cable pull by the shifters is different for both front and rear.
2. Nine speed rear derailleurs will not work with 10 speed mountain rear shifters. They will however work with road “flat bar” 10 speed rear shifters. Dyna speed shifters pull twice as much cable per shift as 9 speed shifters, so if you use a 9 speed derailleur it shifts two gears for every one push.
3. Dyna sys 10 speed rear derailleurs cannot be used with 9 speed shifters. Road 10 speed derailleurs can be used with 9 speed shifters.
4. Nine speed front derailleurs can be used with 10 speed front shifters, but do not work optimally if used with a 10 speed crankset. Nine speed front derailleurs and cranksets can be used with 10 speed chains and front shifters. A nine speed shifter can be used to shift a 10 speed dyna sys front derailleur.
5. 10 speed road chains are different from 10 speed mountain (dyna sys) chains. The dyna sys chain is a directional chain that is made to shift better with 10 speed mountain drivetrains.
6. 10 speed road cassettes and 10 speed mountain cassette use the same sprocket spacing.