It's a XTR on a hardtail mountain bike circa 2000ish. I got it used about a month ago. Sweet ride except for this little PITA issue.
I can get it aligned and shifting great but then after about a 25-30 miles it goes out of alignment again. Suddenly. And by a lot like I lose travel to 2 or 3 rings. Sometimes it's the big rings some times it's the little rings. I'm thinking something must be faulty and needs to be replaced.
Maybe a kinky cable? I can't find any travel problems and the cable looks good on visual inspection. Replacing it is my next plan of attack unless someone here has a better idea.
Maybe a shifter problem? Everything seems ok there. The barrell adjuster isn't loose or broken and the cable is seated properly. Any thoughts?
I can't think of any thing in the derailer itself that could do this.
Someone point me in the right direction ... please!