Rear SPROCKET Large Sprocket Fly Chain For Benelli TRK251 BN251 TNT25 TNT250 Leoncino250 BN TRK TNT 25 250 251 matched Fit For Benelli TRK251 BN251 TNT25 TNT250 Leoncino250 full series 250cc motorcycles Simple bolt on mounting; no or reshaping required during drivetrain Smooth stable power transfer; uniform chain operation for city commute offroad touring forged construction; hardened gear teeth to reduce wear extend life Standard matched mounting hole layout; align with rear hub assembly