This design is for bikes that have no extra space under the seat tube for mounting a traditional friction drive system. Constant friction between motor and tire is maintained by two 1.2mm springs, and adjusted with zip ties on the other end of each spring.
BUILD INSTRUCTIONS
https://gum.co/LqmWJ
PART LIST
Throttle Grip
https://www.banggood.com/custlink/m3v3UjR0gv
Arduino for Analog to PWM converting
https://www.banggood.com/custlink/Kvvmkoh00h
Tension Springs
| FD_Base_Bottom.STL | 99.4KB | |
| FD_Base_Top.STL | 30.6KB | |
| FD_Motor_Mount.STL | 1.8MB |
