It came off a 90's Stumpjumper. I don't honestly know how it works with the indexed 10spd dt shifters, but it does. Occasionally makes me think I should toss a wider-range cassette on.
Same pull ratio, Shimano's stuff between road and MTB was interchangable for a long time (except for front mechs and STIs). :) These 90's MTB components are cheap, precise and made to last for an eternity.
Rad! STX rear mech?