27.5 MTB full suspention rear drive electric bicycle is strong with hidden battery style.all parts is good quality brand  parts .    1. frame use 27.5*2.3 MAXXIS with 6061 Aluminum alloy frame .     2. motor use 36v250w /48V350w/ 48v500w BAFANG motor power .   3. battery  use 36v or 48v10.4 /14.5/16ah panasonic or samsung  lithium battery .   4. brake system  use tektro mechanical disc brake or tektro hydraulic disc brake.   5. front fork use Suntour or RST oil alloy suspention adjustable front fork. 6. display use King-meter LCD or LED display /APT brand LCD display .   7.wellgo alloy pedal . 8. velo  leather grip and saddle.     9.  promax  seat post and handlebar .   10. prowheel crank. 11.front &rear LED light.  12. KMC chain..             13 shimano altus 7 speed or Alivio 9 speed or deore10speed.  14. shock absorber : KS air alloy or Suntour air magnesium shock absorber