with a carbon race bike frame a bafang hd 1000w might fit the bb but it might need modding to fit the motor dv8 did one and could not be put back as a normal bike crank wise.
you would also need the batt in a back pack as putting it on the frame would add alot more waight and vibration could start to crack the carbon esp at high speed.
imo this would also be the same for the bb as the amount of torque from the motor and your effort as well could be to much for the rear triangle to handle and stress the rear frame to the limit.
a ti frame and carbon forks would be a better option imo going mid drive
the best part of the bafang system is you can programme it your self and no need for a dongle as the only limit is when the batt explodes and catches fire going 70mph.
the faster you go the amps needed from the batt goes up a lot so if the pack is to small it will be a point of failure.
same with the motor controller and the winding in the motor it can only take so much voltage and amps.
you would also need the batt in a back pack as putting it on the frame would add alot more waight and vibration could start to crack the carbon esp at high speed.
imo this would also be the same for the bb as the amount of torque from the motor and your effort as well could be to much for the rear triangle to handle and stress the rear frame to the limit.
a ti frame and carbon forks would be a better option imo going mid drive
the best part of the bafang system is you can programme it your self and no need for a dongle as the only limit is when the batt explodes and catches fire going 70mph.
the faster you go the amps needed from the batt goes up a lot so if the pack is to small it will be a point of failure.
same with the motor controller and the winding in the motor it can only take so much voltage and amps.