Spitfire makes more wheels than almost anyone, and every one of them comes down to two choices: the formula (what the urethane is and how hard it is) and the shape (how the wheel is cut). Get those two right, then pick your size.
This guide breaks down every Spitfire formula and shape we carry, with Spitfire's own sizing charts, plus quick picks led by the Formula Four 99A Classics, the Formula Four 99A Conical Full, and Burners for first setups.
Spitfire Basics: Formula, Durometer, and Shape
Formula is the urethane recipe. Spitfire's main lines are Formula Four (its premium urethane), the Classic formula (the original 99 Duro that used to be the standard), Burners (the entry-level line), 80HD (soft cruiser urethane), and Sapphire (a soft riding surface over a hard core).
Durometer is hardness. The higher the number, the harder and faster the wheel. Lower numbers grip more and absorb more vibration.
Shape is the wheel's profile: how wide the riding surface is and how the sidewalls are cut. Shape changes how a wheel locks into grinds, how stable it feels, and how much it weighs.
Spitfire Formulas
| Formula | Durometer | Spitfire Says | Best For | Shop |
|---|---|---|---|---|
| Formula Four | 101A | Harder faster: Spitfire's hardest duro for extra speed | Smooth parks and max speed | F4 101A Classics |
| Formula Four | 99A | Lasting control: speed and control on all surfaces, one of Spitfire's most ridden duros | Street and park, the standard pro feel | F4 99A Classics |
| Formula Four | 97A | Four everywhere: a softer, faster ride for every spot | Mixed terrain, street to park | F4 97A Conical Full |
| Formula Four | 93A | Soft sliders: controllable slide, absorbs impact and vibration | Rough ground, longer sessions | F4 93A Classics |
| Classic Formula | 99A | The original Spitfire 99 Duro: fast, smooth, controllable slide | Skaters who want the original feel | Classic Formula Classics |
| Burners | 99A | High-quality entry-level urethane that doesn't sacrifice performance | First setups | Burners 99A |
| Sapphire | 90A (101A core) | Soft 90 Duro clear riding surface bonded to a 101 Duro Formula Four core | Soft grip with a fast core | Sapphire 90A Radials |
| 80HD | 80A | Soft urethane bonded to a lightweight inner core for true bearing seating | Cruising and rough ground | 80HD Conical Full |
Formula Four is Spitfire's premium urethane. It offers unmatched flat-spot resistance, a smooth anti-stick slide, and a high-rebound compound.
Spitfire Shapes
Each shape has a purpose. Here's what Spitfire says about each one, its sizing chart where available, and the formulas we carry it in.
Classics
The number one wheel shape in skateboarding: a medium-width riding surface with round sidewalls, designed for control in all situations. Best for all-around control.
Available in: Formula Four 93A, Formula Four 97A, Classic Formula 99A, Formula Four 99A, Formula Four 101A.
Bighead
A fuller, rounder wheel shaped for skaters who want a wider riding surface without squarer edges. Best for smooth, all-around riding.
Available in: Burners 99A, Classic Formula 99A.
Conical
A full riding surface without the weight, with a symmetrical cut inside rails for speed, control, and slide when you need it. Best for locking into grinds without extra weight.
Available in: Formula Four 99A, Formula Four 101A.
Conical Full
A wider version of the Conical shape, with a wide riding surface and cut-in sidewalls to decrease weight: a solid, controllable shape for all terrain. Best for stability and locking into grinds.
Available in: 80HD 80A, Formula Four 97A, Formula Four 99A, Formula Four 101A.
Radial
A round-edge, medium-width riding surface that offers the versatility of the Classic shape in the width of a Conical. Best for versatile, all-around riding.
Available in: Sapphire 90A, Formula Four 93A, Formula Four 99A.
Radial Full
A super wide riding surface with round edges for stability and versatility. Best for stability, especially in bowls and transition.
Available in: Formula Four 93A, Formula Four 97A, Formula Four 99A.
OG Classics
Spitfire's original cutaway shape, with a wider riding surface lightened by cutaway sidewalls. Best for a wide, old-school feel without the weight.
Available in: Formula Four 99A.
Lock-Ins
An asymmetrical shape with a conical cut profile on one side and a straight-edge lock-in cut on the other. Best for locking into grinds.
Available in: Formula Four 99A, Formula Four 101A.
Lock-In Classic
Ishod's custom shape: medium width and asymmetrical, with a straight-edge lock-in cut inside for control and a classic round outer sidewall for versatility on any terrain. Best for locking in with classic versatility.
Available in: Formula Four 93A, Formula Four 99A.
Lock-In Full
A wider version of the Lock-In shape: asymmetrical, with a concave cut outside for less weight and a straight-edge lock-in inside for control on all terrain. Best for stable lock-ins on all terrain.
Available in: Formula Four 99A.
Tablets
An original Spitfire shape with a straight-cut profile and thin riding surface: lightweight, quick, and responsive. Best for quick, technical street skating.
Available in: Formula Four 99A, Formula Four 101A.
Classic Full
A wider version of the Classic shape, designed for lasting speed and a more controllable slide. Best for stability and controllable slides.
Available in: 80HD 80A.
Superwide
An extra-wide riding surface bonded to a lightweight, injection-molded inner core for true bearing seating and smooth, consistent speed everywhere. Best for maximum stability for cruising.
Available in: 80HD 80A.
Choosing a Size
Smaller wheels (50 to 52mm) are light and quick for technical street skating. 53 to 54mm is the go-to for street and park. 55 to 56mm adds speed for park and transition, and 57mm and up rolls faster and smoother for bowls, pools, and rough ground. Every product page lists the width and riding surface for each size. For more on sizing, see our skateboard wheels guide.
Choosing by Riding Style
| Style | Formula | Shape | Good Matches |
|---|---|---|---|
| Technical street | F4 99A or 101A | Tablets, Lock-Ins, Conical | F4 99A Tablets, F4 99A Lock-Ins, F4 101A Conical |
| All-around street and park | F4 99A | Classic, Conical Full, Radial | F4 99A Classics, F4 99A Conical Full, F4 99A Radial |
| Transition and bowls | F4 97A or 99A | Radial Full, OG Classics, Conical Full | F4 97A Radial Full, F4 99A OG Classics, F4 99A Conical Full |
| Rough ground | F4 93A or Sapphire | Classic, Radial | F4 93A Classics, Sapphire 90A Radials |
| Cruising | 80HD | Conical Full, Classic Full, Superwide | 80HD Conical Full, 80HD Classic Full, 80HD Superwides |
| First setup | Burners 99A | Bighead | Burners 99A |
Care and Bearings
Rotate your wheels every so often so they wear evenly, and keep them away from water and grit when you can. New wheels are also a good time for fresh bearings. Spitfire makes three tiers: Cheapshots (good), Classics (better), and Burners (best).
Quick Picks
| Pick | Best For | Why |
|---|---|---|
| F4 99A Classics | Best overall | The number one shape in Spitfire's most ridden duro |
| F4 99A Conical Full | Street and park | Wide, stable riding surface with cut-in sidewalls |
| Burners 99A | First setup | High-quality entry-level wheel |
| F4 101A Conical Full | Max speed | Spitfire's hardest duro in a wide shape |
| F4 93A Classics | Rough ground | Soft sliders that absorb impact and vibration |
| F4 99A Lock-Ins | Locking into grinds | Asymmetrical shape with a straight-edge lock-in |
| F4 93A Ishod Lock-In Classic | Ishod fans | Ishod's custom Lock-In Classic shape |
| F4 97A Radial Full | Transition | Super wide and stable in a softer duro |
| F4 99A Tablets | Technical street | Thin, light, and responsive |
| 80HD Conical Full | Cruising | Soft 80A with a lightweight core |
Shop by Line
- Formula Four 99A: Classics, Conical, Conical Full, Radial, Radial Full, OG Classics, Lock-Ins, Lock-In Full, Lock-In Classic, and Tablets
- Formula Four 101A: Classics, Conical, Conical Full, Lock-Ins, and Tablets
- Formula Four 97A: Classics, Conical Full, and Radial Full
- Formula Four 93A: Classics, Radial, Radial Full, and Ishod's Lock-In Classic
- Burners 99A: Bighead shape, 51 to 56mm
- Classic Formula 99A: Classics and Bighead
- Sapphire 90A: Radial shape, 53 to 58mm
- 80HD: Conical Full, Classic Full, and Superwides
FAQ
What's the difference between Formula Four and the Classic formula?
Formula Four is Spitfire's premium urethane, available from 93A to 101A. The Classic formula is the original Spitfire 99 Duro, which used to be the standard.
Are Burners good wheels?
Yes. Burners are Spitfire's entry-level line, a high-quality 99A wheel that Spitfire says doesn't sacrifice performance. They're a great pick for a first setup.
What durometer should I get?
99A is the standard for street and park. Go 101A for max speed on smooth surfaces, 97A or 93A for rougher spots and more grip, and 80HD for cruising.
What's the best Spitfire shape for grinds?
Shapes with a straight inner edge or cut sidewalls, like Lock-Ins, Lock-In Classic, Conical, and Conical Full, help you lock into grinds.
Do Spitfire wheels come with bearings?
No. They're sold as a set of 4 wheels. Spitfire Cheapshots, Classics, and Burners bearings are sold separately.
Keep Building Your Setup
- Skateboard Wheels Guide: Size, Hardness, and Shape
- How to Choose Skateboard Bearings
- How to Install Bearings
- How to Choose Skateboard Risers
- Skateboard Truck Size Guide
- How to Choose a Skate Tool
- Sizing Guide for Decks, Trucks, Wheels, Hardware, and Risers
Ready to roll? Shop all Spitfire wheels.