I've had three XTR M9100 12 speed shifters break on me, all in the same manner. Two were warranty replacements for the first broken one. The latest replacement only lasted about 2 weeks before breaking.
What happens is the shift lever (long one) intermittently stops shifting--just pushes in with no resistance, no clicking and doesn't engage the shifting mechanism. Inside the shifter is a little metal rocker that's supposed to be held closed by (?) a spring. I think the spring breaks and stops holding the rocker closed. (The rocker when closed catches the teeth of a shift wheel.) The red arrow in the picture shows the little tooth end of this rocker lying in an abnormal, open position. Gravity can close the rocker, so once the problem starts, it happens intermittently after that but can still manage to shift on and off.
I've notified Shimano USA every time, but they haven't told me that anything is changing with the design of the shifter. Has this happened to anyone else?
What happens is the shift lever (long one) intermittently stops shifting--just pushes in with no resistance, no clicking and doesn't engage the shifting mechanism. Inside the shifter is a little metal rocker that's supposed to be held closed by (?) a spring. I think the spring breaks and stops holding the rocker closed. (The rocker when closed catches the teeth of a shift wheel.) The red arrow in the picture shows the little tooth end of this rocker lying in an abnormal, open position. Gravity can close the rocker, so once the problem starts, it happens intermittently after that but can still manage to shift on and off.
I've notified Shimano USA every time, but they haven't told me that anything is changing with the design of the shifter. Has this happened to anyone else?
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