I have a Cannondale SISL with the evo 110BCD spider, and 52/36 Q rings (a brand new set of non-aero, from starbike). I have grinded down theoutside of the 52 tooth chainring to fit the cranks without hitting the inside of the crankarm and it is now well clear of the inside of the crankarm.
My issue is that it is impossible to torque any chainring bolts beyond 6Nm as they all fail. The failure is not the threads stripping but a single side of the lip of the nut (the bit fed in from the inside) snapping. It is always just one side that snaps. I have tried several sets of alloy chainring bolts (KCNC and FSA) and all do the same thing. It is as though something isn't straight and they are being torqued on an angle causing the failure. The q rings are both orientated the right way and the spider is in its correct orientation. Any ideas why this is happening. I use alloy bolts on all my cranks and have never had this issue before.
At the current level of torque there is a lot of creaking from the crank so I don't want to leave the torque really low. Also i am a weight weenie so adding steel bolts is not a palatable thought either.
Any ideas? Thanks in advance.
Evo 5.63kg SL3 6.66 viewtopic.php?f=10&t=110579
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