Spitfire Formula Four Classic Silver Swirl 52mm/54mm 101a Skateboard Wheels are the newest wheels from Spitfire and are going back to the classic swirl in the best formula on the market! Tested by Spitfire Team riders, Formula Four Performance Urethane lasted longer, withstood more abuse and performed superior to all other wheels. Spitfire Formula Four Urethane was developed to combine all the desired properties of a performance wheel without sacrificing any one attribute at the expense of another. Formula Four's True lasting Performance Urethane comes not from a single benefit, but from a combination of qualities and features that together produce a truly great wheel Formula Four Performance Urethane is unlike any other.
54MM Specs;
| Type | Street/Park/Vert |
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| Diameter (mm) | 54 | |
| Duro (a) | 101 | |
| Contact Patch (mm) | 16.5 | |
| Lip Profile | Round |
|
| Surface | Smooth |
|
| Bearing Core | Centerset |
|
| Colour | White | |
52mm Specs:
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