Originally Posted by RayB

The bearings in those cranks are not of the best quality. I have had to replace 3 of them and the bike only has about 100 kms on them. The latest one is on the verge of failing as well. I have been desperate in trying to find a work around with only options being to either have a proper machine shop rebuild the bearing with decent internals or to stick a bolt on sprocket onto my rear disc hub and flip the motor around to get it out of the chainline and away from having to use the freewheel chainring. I also resorted to using just a standard single with no freewheel but that forces you to peddle at all times the motor is engaged and is not the safest option.

Just saying keep an eye on it.