got them on our off road stuff,replaces throttle tube, if its the same thing? its like a cam that pulls the first quarter of cable travel a bit more progressive , ie. the first 5-10deg of twist becomes more like 10-15deg, stops us from flipping the bikes on knarley slow stuff, depending on which cam you use , most come with 3 , will have to say that if you don't keep grease on the part of the cable that rubs it will fray and make sure they're aluminium not plastic, from experience