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SPITFIRE | Invasion - Formula Four Conical Full Wheels | 53mm / 54mm / 99a
SPITFIRE | Invasion - Formula Four Conical Full Wheels | 53mm / 54mm / 99a
SPITFIRE | Invasion - Formula Four Conical Full Wheels | 53mm / 54mm / 99a
SPITFIRE | Invasion - Formula Four Conical Full Wheels | 53mm / 54mm / 99a

SPITFIRE | Invasion - Formula Four Conical Full Wheels | 53mm / 54mm / 99a

SPITFIRE
$49.99
Size guide

Size Guide

Size Guide

Deck Sizing

Choose deck width based on your style, terrain, and shoe size.
Length and wheelbase vary by shape; width is the key starting point.

Deck Width Best For Notes
7.5″ – 7.8″ Youth, smaller riders Lighter, quicker flips; less foot space.
8.0″ - 8.125" All-around street/park Great starting point for most skaters.
8.25" – 8.3″ Street & park balance More landing room; still flicks well.
8.5″ - 8.75 Park, bowls, transition Extra stability and control at speed.
9.0" + Vert, cruise, bigger feet, Swampy Stable ride; flips feel heavier.

Shoe size tip: US Men’s 6–8 ≈ 7.75–8.0″ • 9–11 ≈ 8.0–8.5″ • 11.5+ ≈ 8.5″+. Preference varies.

Truck Sizing

For best performance, match truck axle width to deck width.
Sizing Labels vary by brand—use this as a quick reference.

Deck Width Axle Width (approx.) Common Labels*
7.75" 7.6″ – 7.75″ (193–197 mm) Indy 129 • Thunder 145 • Venture 5.0 • Ace 22
8.0″ 7.75″ – 8.0″ (197–203 mm) Indy 139 • Thunder 147 • Venture 5.2 • Ace 33
8.25″ - 8.3" 8.0″ – 8.25″ (203–210 mm) Indy 144 • Thunder 148 • Venture 5.6 • Ace 44
 8.5″ - 8.6" 8.25″ – 8.5″ (210–216 mm) Indy 149 • Thunder 149 • Venture 5.8 • Ace AF1 55
8.75" 8.5″ – 9.0″ (216–229 mm) Indy 159 • Thunder 151 • Venture 6.1 • Ace AF1 60
9.0″+ 9.0″ – 10.0″ (229–254 mm) Indy 169 • Thunder 161 • Venture 6.1 • Ace AF1 66 • Ace 55

*Size names differ slightly by brand/series—check each product page for exact fit.

Wheel Sizing

Pick diameter for terrain/speed and durometer for hardness/grip.

Diameter Use Ride Feel
50–53 mm Tech street, smooth parks Quick pop & flip; least speed over cracks.
52–54 mm All-around street/park Balanced speed/control; most popular.
54–56 mm Park, bowls, small transition More roll speed; stable landings.
56–60+ mm Rough streets, cruiser, big transition Faster over cracks; heavier feel.
  • Durometer: 99A = classic street; 101A = harder/faster (smooth parks); 78A–87A = soft/cruiser/rough ground.
  • Contact patch: Wider = more grip/stability; narrower = easier slides.
  • Wheelbite tip: Bigger wheels may need risers and/or firmer bushings.

Clothing Sizing

Clothing sizes vary by manufacturer/brand. For the most accurate fit, please refer to the Size Guide on each product page—measurements are provided per brand and style.

 
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    • SPITFIRE Formula Four Skateboard  Wheels
      Conical Full Shape

      INVASION - Fabiana Delfino Signature Series
      Natural Colored Wheels with graphics of Aliens getting bombed and burned out.

      Available in multiple sizes: 53mm / 54mm

      The #1 Shape in skateboarding worldwide-proven for speed and control.

      • Conical Full
      • 99a
      • White Urethane Color 

      UNMATCHED ABRASION RESISTANCE EQUALS FEWER FLAT SPOTS SMOOTH ANTI-STICK SLIDE - MORE CONTROLLABLE GRIP - LASTING SPEED

    SPITFIRE Formula Four Skateboard  Wheels
    Conical Full Shape

    INVASION - Fabiana Delfino Signature Series
    Natural Colored Wheels with graphics of Aliens getting bombed and burned out.

    Available in multiple sizes: 53mm / 54mm

    The #1 Shape in skateboarding worldwide-proven for speed and control.

    • Conical Full
    • 99a
    • White Urethane Color 

    UNMATCHED ABRASION RESISTANCE EQUALS FEWER FLAT SPOTS SMOOTH ANTI-STICK SLIDE - MORE CONTROLLABLE GRIP - LASTING SPEED

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