Spitfire F4 Classic Gonz Shmoos 99A Wheels 56mm
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Formula Four Performance Urethane lasts longer, withstands more abuse and performs superior to all other wheels. Spitfire's 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.
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