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Spitfire Wheel Guide: Durometers, Shapes & Formula Four

Amateur Athlete • Independent since 1982

Spitfire wheels

Durometers. Shapes. Find your ride.

Find the right Spitfire wheels for your ground, your setup, and the way you skate. Compare Formula Four, 93-duro Soft Sliders, cruiser formulas, and wheel shapes.

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Since 1987

Here since day one.

Born in San Francisco in 1987, Spitfire grew into one of skateboarding’s most recognized wheel brands, known for its Bighead logo, influential team, and commitment to performance. Amateur Athlete has carried Spitfire since its creation, keeping the fire rolling in Bethlehem from day one.

Why skaters ride Spitfire

Formula Four. Feel the difference.

From lasting speed and controlled slides to softer options for rough streets, Spitfire gives you choices that change the feel of your setup. Use our guide to find your wheel, then shop what’s in stock.

Spitfire Kader Sylla Formula Four wheels in natural and black purple swirl

The Spitfire wheel guide

Which Spitfire wheels are right for you?

Start with the surface you skate most. Durometer tells you how hard a wheel is; shape changes its profile and contact patch. Formula, size, and your own preferences also affect the ride.

01

Rough streets + tricks

Start by comparing 93 Soft Sliders and 97 Formula Four. The 93 offers a softer ride while retaining a controlled slide.

02

Street + skateparks

99 Formula Four is a useful starting point. Compare a Classic profile with Conical Full or Radial Full if you prefer more riding surface.

03

Cruising + getting around

Look at 80HD and 90-duro Sapphires for a softer roll. These formulas put comfort and grip first.

Spitfire durometers & formulas

Spitfire’s range spans 80, 90, 93, 97, 99, and 101 duro. A higher number generally means a firmer wheel, but the urethane formula matters too.

Duro Formula / range Ride & starting point
80 80HD Soft, cored wheels for a smooth, grippy ride. A starting point for cruising and rougher pavement.
90 Sapphires A 90-duro riding surface over a 101-duro Formula Four core. A soft cruiser option with a supportive center.
93 Formula Four Soft Sliders Softer wheels with a predictable slide. Consider them for rough streets when you still want to skate tricks.
97 Formula Four A softer-feeling Formula Four option with grip and slide. Consider it when you want a little more give than 99.
99 Formula Four • Classic 99 • Burners A popular hard-wheel starting point. Formula Four focuses on performance; Classic 99 is Spitfire’s original formula; Burners are the entry-level option.
101 Formula Four Spitfire’s hardest Formula Four duro. Consider it for a firm, fast feel on smooth skatepark surfaces.

Spitfire wheel shapes

Use this list to compare profiles across Spitfire’s range. Shape, size, and duro combinations vary by model and release; the collection shows what we have available now.

Classic
Rounded sidewalls and a balanced profile for versatile skating.
Radial
Rounded edges with a broader contact patch than a Classic.
Conical
Cut-in sidewalls with a responsive, lighter profile.
Lock-Ins
Asymmetric sides: one conical edge and one straight lock-in edge.
Tablets
Straight sidewalls and a narrow contact patch for a quick feel.
OG Classic
An original cutaway profile with a wider riding surface.
Lock-In Classic
Ishod Wair’s blend of Classic and Lock-In profiles.
Lock-In Full
A wider Lock-In profile with an asymmetric sidewall design.
Radial Full
Wide contact patch and rounded edges for a stable feel.
Conical Full
Wider Conical profile with cutaway sides and a broad contact patch.

More profiles in the range

Radial Slim
A slimmer rounded-edge profile documented in Spitfire’s Formula Four range.
Classic Full
A fuller Classic-style profile in the 80HD cruiser range.
Superwides
An extra-wide profile featured in the 80HD range.

Radial Slim is also documented in Spitfire’s earlier Formula Four guide. Model availability changes by season.

Spitfire wheel questions

Are 93-duro Soft Sliders Formula Four wheels?

Yes. Soft Sliders belong to the Formula Four family. They combine a softer 93-duro ride with a controllable slide, making them worth considering when rough ground is part of your daily skating.

Is Classic 99 the same as Formula Four Classic?

Classic 99 names Spitfire’s original urethane formula. Classic can also name the wheel’s shape. Check both the formula and the shape in a product’s name and specifications.

What is the difference between Conical Full and Radial Full?

Both have a broad riding surface. Conical Full uses cutaway sidewalls, while Radial Full has a rounded-edge profile. Your preferred feel and how you approach ledges, coping, and slides can guide the choice.

This guide covers Spitfire’s range; it does not mean every combination is currently in stock.

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Brand references: Spitfire urethane guide · Spitfire shape guide

Built for the session

Formula Four & Spitfire wheels

Spitfire’s popular Formula Four urethane is built for lasting speed, resistance to flat spots, and a smooth, controlled slide. With a range of shapes and durometers, there’s a Formula Four for everything from technical street skating to long park sessions.

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Softer ride. Controlled slide.

93-duro Soft Sliders

Part of the Formula Four family, Spitfire’s 93-duro Soft Sliders pair a softer ride on rough ground with a consistent, controllable slide. They keep that familiar Formula Four approach to performance while taking the edge off less-than-perfect streets.

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Keep the fire going

Hoodies, denim, apparel & hats

Amateur Athlete has a large selection of Spitfire hoodies, denim, apparel, and hats. From the Bighead logo to fresh seasonal graphics, find your next everyday skate staple.

See the full Spitfire collection

Since 1987

Wheels from a shop that knows skateboarding.

Amateur Athlete has helped skateboarders choose their setups since 1982. Shop Spitfire online or visit us in Bethlehem, Pennsylvania, for help finding your next set.

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