stratohunter
10 mW
- Joined
- Apr 12, 2022
- Messages
- 34
Today when I was doing a recreational riding, my TSDZ2-equipped gravel bike started to make loud squeaking noises halfway. I disregarded it for half an hour, until it developed to loud enough to force me to stop for an inspection. I then found my TSDZ2 had broken the securing and swung up, chiseling a small dent on the aluminum downtube with one of the extruding screw nuts (see pictures below).
To explain, I did not use the securing block and the bridge-plate provided by the manufacture since my chainstay was too thick. Instead, I used aluminum cables to tie the big securing bolt of the motor onto the chainstay. This worked for several months before today's failure.
The dent is about 3cm from the spindle radially. So considering the 90Nm torque of the TSDZ2, the force making the dent was close to 300 kg. The frame looks fine apart from the dent, but considering the motor had been "biting" the downtube with varying forces up to 300 kg (as proved by the squeaking sounds) for half an hour, could my frame be weakened already due to fatigue? Is the frame still safe to ride at 40+ km/h on very bumpy roads for commuting after me finding a better way to secure the motor? Thanks!
To explain, I did not use the securing block and the bridge-plate provided by the manufacture since my chainstay was too thick. Instead, I used aluminum cables to tie the big securing bolt of the motor onto the chainstay. This worked for several months before today's failure.
The dent is about 3cm from the spindle radially. So considering the 90Nm torque of the TSDZ2, the force making the dent was close to 300 kg. The frame looks fine apart from the dent, but considering the motor had been "biting" the downtube with varying forces up to 300 kg (as proved by the squeaking sounds) for half an hour, could my frame be weakened already due to fatigue? Is the frame still safe to ride at 40+ km/h on very bumpy roads for commuting after me finding a better way to secure the motor? Thanks!