Originally Posted by
Leisesturm
IMO a BBSHD is much too much power for that bike.
You simply couldn't be more wrong on that. That bike will easily "handle" considerably more power. 7 speed, mechanical discs, what's not to love? Have a BBSHD on an aluminum frame MTB. I did use a torque arm due to some potential cautions about chewing up the aluminum bottom bracket, but as long as one torques down the bottom bracket right that is more of a belt and suspenders overkill.
Besides the lines are blurring on some of these motors. Current limit on a BBS02 is a 25 amp whereas BBSHD is 30 amps. So a BBS02 with 52V battery has close to the same max wattage as the BBSHD with a 48V battery.
Worst case program the BBSHD to a 25 amp current limit and enjoy the added reliability of the larger, better constructed motor.
The BBS02 might be a better choice from a cost perspective, but not because the bike "can't handle it".