I broke half a teeth off a 17T BN pinion from just racing (the drive didn’t see any shock loads, no jumping and landing with throttle, etc).
Though I’ve been running 200A at 175KV, so pretty good torque, and been hitting that fairly consistently. As much as I love the sound of mod1, the raceboard for me has to stay on a higher modulus for reliability. Now I’m having wear issues with really good quality mod1.5 pinions. Even considering trying mod2 for the next revision to get it literally bulletproof (and to be able to potentially machine gears inhouse and send out just for professional hardening!)