1.Shimano 7 Speed system 2.Alloy shock fork, disc brake, handlebar, rim, hub, crankset, ... gear/brush Battery36V 8Ah lead-a Specification: 1.Shimano 7 Speed system 2.Alloy shock fork, disc brake, handlebar, rim, hub, crankset ... , pedal 3.Build-in pedal assist system 4.Travelling distance: ≥50km 5.Max Speed: as required 6.Max Load: ≥75kg Optional ...