I have been riding one of the new xt r-derailleurs for about a month. It is rapid rise, but other than a couple of miss-shifts that has proven to be a minimal problem. I did have a problem this weekend that I am unfamilliar with. The derailleur became very stiff at it's maximum travels range (high and low). To the point where it wouldn't retract into low gear and I had to click down 2 gears for it to retract from the high gear. Mid range appeared to be unnafected.
I serviced the bike on Friday including a cleaning and oiling of the derailleur (with triflow and a wipedown of excess oil post cycling the derailleur through the gears). The ride was dusty on Saturday. What I am guessing happened was that excess oil on the limit screws and pivots collected dirt and become clogged enough to fubar my shifting. The odd part is that I have never had this sort of a failure in the last 10 years of riding.
Are the new XT/XTR rear derailleurs sensitive to dirt buildup? Rapid rise issue? What do the drivetrain gurus think?
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