13-Tooth Max-Torque Fun Kart Clutch for Versatile 3/4" Applications13 teeth for balanced speed and torque in fun karts 3 4" crankshaft compatibility for easy fitment Suits engines from low to higher HP ranges Durability meets simplicity in this clutch, perfect for keeping your yard kart adventures or spec class battles hassle free and fast paced. The 13T sprocket strikes a sweet spot for mixed terrains, providing enough pull for hills while allowing decent top end velocity on flats. Racers and casual users alike