Does NOT include shifter or sprocket Smooth, Seamless Shifting - no steps, no gaps, no hesitations, no missed gears, no dropped chains 330% Nominal Ratio - 0.5 underdrive to 1.65 overdrive Smooth Shifting Under Force - shift any time, in practically any condition, even under high pedal force Perfect for e-Bikes - easy, more active shifting means you`ll manage power better, increase range, extend battery life and reduce wear to motor and drivetrain components Compatible with mid-motor ebike systems rated at 250W or less Nearly maintenance free Quiet Operation Overall axle length: 183mm RR 32H B/O 3/8 Aly Blk 2450g 6B 135mm 125mm 125mm 26mm 26mm