Set of Spitfire X Grimple F4 Grimplehead Lock In Full Black Skateboard Wheels in 55mm 99du.

A wider version of the lock in shape. Asymmetrical design with conical cut outside for less weight. Straight edge "lock in" inside for control on all terrains.

Formula Four Performance Urethane

• Formulated for a harder-faster ride
• Unmatched flatspot resistance
• Smooth anti-stick slide
• More speed and control
• 100% True performance urethane