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I HIGHLY doubt this, but it could be possible that you are running a compact chainring set-up on cranks originally set up for triple chain-rings. I derped around with this before, and noticed that the chain would slip from the big-ring into a void between the two chain-rings and make you spin endlessly, creating a horrifically loud and embarrassing grinding ...


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I have that problem with my road bike as well, Shimano sora STI shifter, claris derailleurs, 2x9 setup. What I did : make sure limit screw (L) adequately adjusted, i.e. just about to rub the chain when Small CR + Largest Cog. (so you are ok here) shifting in sequential manner. e.g. 2-9 then 2-8, 2-7 ... 2-5 (or 2-4); at this point, shift to 1-5 (or 1-4) ...


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I wouldn't expect to throw the chain inwards or outwards (at least on my 3x8 setup) if the limit screws are correct. This is true whatever sprocket I'm using and even if I push the lever the wrong way (it's not unknown when I'm tired especially if I've recently been riding another bike). That said you shouldn't be shifting like that as you acknowledge. ...



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