Spitfire Formula Four 55mm 99D Lock Ins Skateboard Wheels

The Spitfire 55mm Formula 4 Lock-In 99a Wheels are an asymmetrically shaped wheel designed for more control. A conical cut on one side with a straight edge cut on the opposite built for precise lock in grinds. 

Spirtfire’s Formula 4 Urethane: Higher rebound for faster speeds over rough and smooth surfaces with a hard durometer for a smoother, faster ride that won't mush out over time. More speed and control on all surfaces; Unmatched flatspot resistance!