As per my troubleshooting to find a bike creak (Ultegra FC-R8000 Right Crank Arm Creak) - I have installed and removed the same chainring bolts ~8 times. In the process I snapped one of them. Each of my installs have used a torque wrench at 14Nm with a Torx T30 bit.

I have noticed that when installed on a crank it seems more difficult to push the T30 into the bolt, but when they are removed it is easy to slide the bit into the bolts.

Has anyone else experienced this behaviour from these (or other Shimano) chainring bolts? Am I doing something wrong if this is happening?

  • Did you buy the crankset from the LBS you mentioned in the other question? Was the one that snapped from the old crankset or the new crankset? – Superman.Lopez Jun 17 '19 at 4:42
  • I did buy the cranks from my LBS. The one I snapped was from the old crankset. The new set came with a new set of bolts so I used one from there. I'll update the other question with this - but I did try all 4 new bolts in my troubleshooting as well. – Vitamin-T Jun 17 '19 at 13:45

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