250W 7AH 10Ah 36V Intelligent brushless controller Alloy aluminum 7 speed gears/ GATES belt/ Single gear 28inch/700C city e-bike double swing gate motor for sale

250W 7AH 10Ah 36V Intelligent brushless controller Alloy aluminum 7 speed gears/ GATES belt/ Single gear 28inch/700C city e-bike garage door system