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Half way through ride today my left hand shifter suddenly decided it wouldn't shift from middle to big ring - no crash etc to knock it out.
Have played with limit screws as front mech not moving far enough but hasn't made a difference. Is the shifter broken?
check somehing isnt jamming the mech like a smll stone or something, if not undo the cable and see if the mech will move by hand, if i do's then its probably the shifter
Could be lots of things. Check your cranks. I had the same symptom last week; a few miles later my left crank fell off. 😕
SRAM X9?? if so it's a known warranty issue...
i use sramx9 m8 and ive had my front mech for a while now, i used to have a bash ring on but now have a big ring, mine dosent shift into it unless im in a high gear, i dont know if this is how its supposed to be as its a long time since i used a big ring, or like you say, try messing with the limit screws or buy a new mech if you have tried everything else.
Cable stretched or slipped a little.
can you push the mech by hand into the correct position?
is it a plastic bodied shifter?? I found that the plastic had cracked on mine once and it was flexing the shifter therefore not pulling fully to get it on the big ring...
also, give it a reet good clean and gt85 ?
could be caused by many things...but almost certainly not limit screws
+1 for a small stone or crud in the mech.