Overpower
You asked the motor for more torque than it has available. Hard acceleration on low battery. Punching it uphill at speed. Hitting a bump while already near the limit. The motor maxes out and can’t keep the pedals under you.
Overpower vs overlean
Often used interchangeably. Technically, overlean is about exceeding the lean angle the motor can compensate for. Overpower is about exceeding the torque capacity regardless of lean. In practice, both lead to the same outcome: the wheel falls behind you and you go down.
How it happens
You can overpower any EUC by riding near the top speed and then accelerating hard. The alarms might fire, but in dynamic situations - a sudden gust, an unexpected bump - the demand spike happens faster than the warning system can respond.
555 take
The fix is the same as overlean: don’t ride near the limit. Keep reserve. The riders who overpower their wheels are almost always riding at speeds where small surprises become big problems.