Vee Tire Co. Speed Booster 20x1-3/8 Tire left-hand-crankcase The adjustable sheave lets you

The adjustable sheave lets you customize the acceleration profile to match your riding style — all in one bolt-on kit

OEM-spec dimensions — direct fit

Yamaha - CW50 (98-99)

Fits both A-block (54mm) and B-block (57mm) GY6 engine families

Vee Tire Co. Speed Booster 20x1-3/8 Tire left-hand-crankcase The adjustable sheave lets youVee Tire Co. Speed Booster 20x1 3 8 Folding Bead Tire with B Proof Aramid Belt and Fast 50 rubber compound. For BMX racers who demand lightweight, and better corning stability. Speedboosters tread pattern cuts down on drag and saves precious seconds in race conditions. The B Proof casing features a specialty material that adds extra protection without the weight. Nearly identical to a fabric seal, the casing is paper thin but adds extreme strength.