Harley fat tire electric bike is very hot sales .all parts is good quality brand  parts . 1.frame use 20*4.0 kenda with 6061 Aluminum alloy frame.  2.  motor  use 36v250w / 48v500 /48v750w bafang motor power .  3. battery  use 36v or 48v10.4ah /14.5/16ah panasonic or samsung  lithium battery brake system  use tektro mechanical disc brake or tektro hydraulic disc brake.  4. front fork use MOZO hydraulic or mechanical alloy suspention adjustable front fork  5. display use King-meter LCD or LED display /APT brand LCD display       6. alloy rear rack with LED light . 7.wellgo alloy pedal .  8. velo  leather grip and saddle . 9.promax  seat post and handlebar     prowheel crank. 10.front &rear LED light  .11 KMC chain.              12.shimano altus 7 speed