Spitfire Lock-Ins Formula Four 99 A

Spitfire Formula Four Lock-Ins 99A skateboard wheels combine Formula Four urethane with Spitfire’s distinctive asymmetric Lock-Ins shape.

The inner side features a straight edge designed to provide a defined contact surface on curbs and rails. The outer side has a sculpted conical profile that creates the signature Lock-Ins geometry while reducing material where it is not needed.

The 99A hardness delivers a precise, controlled response. Formula Four urethane provides high resistance to abrasion and flatspots while maintaining consistent speed and performance over time.

Spitfire’s Anti-Stick Slide System ensures smooth, controllable slides. Diameter, width and contact patch vary according to the selected size, while the asymmetric Lock-Ins shape, 99A hardness and Formula Four compound remain unchanged.

Choose Spitfire Lock-Ins 99A for lasting speed, controlled slides and a purpose-built asymmetric profile.

Technical Features

• Spitfire Formula Four urethane
• 99A hardness
• Asymmetric Lock-Ins shape
• Straight inner edge
• Sculpted conical outer profile
• Anti-Stick Slide System
• High abrasion resistance
• High flatspot resistance
• Set of 4 wheels