NCY Secondary Sliding Sheave Assembly for 50cc 2-Stroke A/C Honda, Kymco Scooters INCLUDES: OD: 118mm ID:21mm Sleeve Diameter: 45mm Shoulder/Race OD: 61mm 39mm Nut COMPATIBILITY: Honda – Dio SP-SR 50 2T, Dio ZX 50 2T, Elite 50 Kymco – CX-CX Super 50 2T, DY World 50 2T, DJY 50 2T, K 12 50 2T SYM – DD 50 2T, Fiddle 50 2T, Flash/Free 50 2T This NCY adjustable secondary sliding sheave has two sets of ramp angles, one steeper than the other. These allow you to adjust how quickly the pulley engages. A quicker engagement means more power off the line, and more gradual engagement gives you more power at speed. Fits Honda Dio & Elite as well as SYM DD. **