Features: Teeth: It has 45 teeth (45T). Chain pitch: It is designed for a 520 type chain. That makes it ideal for a "520 conversion" on motorcycles that come with 525 from the factory, giving an even greater cut in weight and friction. Material: Made from high-strength 7075 T6 aluminium. Finish: It has a hard anodised finish for maximum protection from wear. TECHNICAL ADVICE. By changing the ratio the manufacturer recommends we get a different performance — a different behaviour — from the motorcycle. HIGHER TOP SPEED - FUEL ECONOMY (SUGGESTED FOR TOURING) Fewer teeth at the rear. More teeth at the front. MORE ACCELERATION - SUGGESTED FOR TOWN. More teeth at the rear. Fewer teeth at the front