rcguy1958
50cc
+1 on the over tightening theory. I'm still using black bolts and they've been holding up. The other contributing factor , to me any way, was the wheel pants. Seemed to me that even on a relatively good landing, the wheels would some times grab them ,roll them over until they touched the ground and the wheel pants would act like a chock and stop the wheels, causing the bolts to break. Since removing the wheel pants haven't broken any bolts.