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 It fits: CBR1000 RR-R Fireblade ABSSC82A 20-21 CBR1000 RR-R Fireblade SP ABSSC82B 20-21 NT1100 22-25 NT1100 DCT 22-25