Spitfire Formula Four 99A Classics Wheels 51mm pair Formula Four 99A urethane with the Classic shape. Formula Four 99A is made for speed and lasting control on all surfaces, and it's one of Spitfire's most ridden duros worldwide.

At 51mm x 31mm, with a 15.3mm riding surface, smaller diameters like this sit low and light for technical street skating. Sold as a set of 4.

Who These Wheels Are For

• Skaters who want all-around control
• Technical street skaters
• Skaters who want Spitfire's most ridden duro
• Spitfire fans

Features

• Formula Four 99A urethane
• Formula Four urethane: unmatched flatspot resistance and smooth anti-stick slide, per Spitfire
• Classic shape
• 51mm diameter, 31mm wide, 15.3mm riding surface
• Set of 4

Benefits

• Speed and lasting control on all surfaces
• All-around control
• Smaller diameters like this sit low and light for technical street skating

Specs

Compare Formula Four 99A Classic Sizes

Every size in this line uses the same formula and shape.

Classics in Other Durometers

The same Classics shape in a different formula or durometer, in this size or the closest one available.

Complete Your Setup

New wheels deserve fresh bearings. Spitfire makes three tiers:

• Spitfire Cheapshots Bearings (Good): Spitfire's base-level bearing, tested by the pro team, with removable black shields to keep the crud out.
• Spitfire Classics Bearings (Better): Superfast and durable, with heat-resistant chromium steel rings, removable nylon cages, and blue removable shields.
• Spitfire Burners Bearings (Best): Spitfire's high-performance pick, with polished honed races and high carbon chromium steel, packed in a reusable tin.

FAQ

Is 99A hard or soft?

Hard. 99A is the standard street and park hardness: fast, with a controllable slide.

What is the Classic shape good for?

All-around control. Spitfire describes it as the number one wheel shape in skateboarding: a medium-width riding surface with round sidewalls, designed for control in all situations.

What size wheels should I get?

Smaller wheels (50 to 52mm) are light and technical, 53 to 54mm is the street and park go-to, and 55mm and up adds speed for transition and rough ground. See our skateboard wheels guide for more.