my mate has been using his xc pro thumbies for tha last 14 years non stop, with various mechs, sachs plasma, 8 speed lx, 9 speed xt. etc... theyve been on all sorts of bikes, numerous kona rigid frames, on-one inbred, santacruz superlight. he swears by them(and has a nos pair in his tool box, just incase they give up the ghost). the best thing is they marry up quite well mith modern disc brake levers too, as the modern paul/dura-ace equivalent on my bike dont :cry: