Renthal's sprockets are made from a special steel (with nickel, chromium and molybdenum). Their centre is refined so it can combine strength and hardness in harmony. It offers reduced weight. 17 Teeth. 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