Spitfire Formula Four 101A Conical Wheels 54mm pair Formula Four 101A urethane with the Conical shape. Formula Four 101A is Spitfire's hardest duro, built on proven Formula Four performance for a harder, faster ride and extra speed.

At 54mm x 32.1mm, with a 20.1mm riding surface, this mid size is the go-to for street and park. Sold as a set of 4.

Who These Wheels Are For

• Skaters who want locking into grinds without extra weight
• Street and park skaters
• Skaters on smooth spots who want max speed
• Spitfire fans

Features

• Formula Four 101A urethane
• Formula Four urethane: unmatched flatspot resistance and smooth anti-stick slide, per Spitfire
• Conical shape
• 54mm diameter, 32.1mm wide, 20.1mm riding surface
• Set of 4

Benefits

• Maximum speed on smooth surfaces
• Locking into grinds without extra weight
• This mid size is the go-to for street and park

Specs

Compare Formula Four 101A Conical Sizes

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

Conical in Other Durometers

The same Conical 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 101A hard or soft?

Hard. 101A is Spitfire's hardest duro, for extra speed on smooth surfaces.

What is the Conical shape good for?

Locking into grinds without extra weight. Spitfire describes it as a full riding surface without the weight, with a symmetrical cut inside rails for speed, control, and slide when you need it.

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.