Sprocket Fit For Benelli Silent Durable Engine Pinion Rear 13T 14T Leoncino TRK251 TNT25 TNT250 BN 250 251 Leonocnio 250 TRK251 TNT25 TNT250 TNT 25 250 BN 250 251;serves as direct transmission gear replacement part Fits hub output shaft splines;needs no extra for quick mounting Built with internal mute buffer structure;reduces friction noise during daily offroad rides Constructed with forged body;fine polished gear teeth to slow surface abrasion over long use Supports 13T 14T tooth options;all parts keep unified dimension standards