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Just sheared one of mine on an Ultegra R8020 11-speed crank. It's a Torx 30 screw made of aluminium, so it sheared quite easily when I tightened it to the Shimano recommended 12 - 16 NM. This seems far too much and even 8 NM seems too much. I managed to get a Sora screw, which gets me back on the road, from the LBS and they recommend 6 NM with alloy screws.


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These features are designed in to aid shifting and chain retention during shifting. More modern or higher quality rings use riveted pins instead along with ''malformed'' teeth.


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