spitfire F4 Lock-Ins 99a 53/55mm

Grind confidently with the Spitfire Formula Four Lock-Ins Skateboard Wheels. The Spitfire Lock-In shape features a familiar conical cut profile with a straight edge on the other side in order to lock into grinds for reduced slipping. Poured with Formula Four Urethane in a medium profile with a smooth surface. Sold as a set of four in multiple sizes and durometers.