20x4.0" Bafang 48v Motor & Wheel Assembly 500w - Front Brand_Kenda The smaller 650b diameter means

The smaller 650b diameter means it fits into many existing 700c frames to give your current bike an entirely different feel and increased versatility

Take it upstairs in an elevator and park it inside at home or at work—it needs just a wee bit of floor space

Look at this

Keeps the HSD wobble-free while you load and unload a kid or heavy cargo

sealed cartridge bearings

20x4.0" Bafang 48v Motor & Wheel Assembly 500w - Front Brand_Kenda The smaller 650b diameter meansFeatures: Size: 20x4. 0" 1 Wheel & Rim Assembly Included (for front or rear) Aluminium Construction Stainless Spokes 48V 500W Bafang Hub Motor Does not include Motor Wiring Loom, Discs, Tyres Tubes Requires 500W or 750W Rated controller to operate Compatible replacement for 20 Ampd Bikes