Originally Posted by
evbkzzzz
The PAS system, designing planetary gear to get the torque, choosing the motors,etc. in comparison a hub motor is just get a outrunner motor and fix it on the wheels. Correct me if I am wrong.
When engineering my build of a hub motor, I had to balance the motor windings, noload speed, human input, hill climbing, motor torque, motor speed, motor power. Its purpose built for me, rather unlike anything else, and does 25mph for 25 miles with 25lb weight (+3lb battery, lol).
Of course you can just build a 50+ lb bike that goes 15-20mph without any design effort.
yup, what
linberl has is a good alternative too (if you want low torque, fair weather, light weight low powered build). So many Choices!