SPITFIRE FORMULA FOUR CLASSIC 55MM 99D (Set of 4)

The Spitfire Formula Four Classic wheels are a workhorse setup built on Spitfire's industry-leading F4 urethane. Formula Four is the pro standard: more speed and control on every surface, unmatched flat-spot resistance, a smooth anti-stick slide, and a high-rebound compound that — in both street use and Spitfire's high-speed lab tests — keeps its shape and size longer than any other wheel. That durability makes a premium set like this a genuine value over time.

At 55mm, these run the Classic shape — the #1 shape in skateboarding worldwide, with round sidewalls and a medium profile proven for speed and control in every situation. The 55mm diameter is a versatile all-around size, giving you a touch more roll speed than a 53–54mm without moving into a bigger setup. The 99a durometer hits the sweet spot: fast and slidey like a harder wheel, but forgiving enough for everyday terrain. Sold as a set of four.

Specs:

• Diameter: 55mm
• Durometer: 99a (marked "99D" in Spitfire's branding)
• Shape: Classic (round sidewalls, medium profile)
• Formula: Spitfire Formula Four (F4)
• Terrain: Street / park / all-terrain
• Made in: USA
• Brand: Spitfire Wheels
• Sold as: Set of 4

Need bearings, trucks, or hardware to finish a build? Grab them at checkout, or ask us in-store and we'll set you up.