This is not true. The three current indexed shifting systems (Shimano, SRAM and Campagnolo) all have different ratios of derailleur movement to cable travel. So, for example, matching a Campagnolo derailleur to a Shimano 9spd shifter will not index properly on a Shimano 9spd cassette.Mel Erickson said:The derailleur doesn't care what shifters you use but the cassette sure does. As long as the brifters and cassette are compatible the derailleur should work.
You can't mix one manufacturer's derailleurs with another manufacturer's shifters and cassettes for 8spd either. Even if the shifter and cassette match each other, you still need to use a compatible derailleur for correct indexing.Mel Erickson said:But we're talking 8spd stuff here. I guess I should have clarified.
For the sake of this discussion I will follow the following conventions:Mark McM said:
I am using a ten year old Suntour XC Pro RD with my nine speed STI shifters, and a nearly new Deore XT RD with my eight speed Suntour thumbshifters and a eight speed Shimano cassette.russkat said:Will 8sp Suntour Suberbe Pro RD work with STI brifters?