Spitfire Wheels: F4 99a Radial Full Size:54mm it serves up a balanced

it serves up a balanced blend of flex and pop

Full-perimeter venting ensures maximum airflow for a clear

2 layer fully seam taped Glacier construction

Prototyped for over a year

Spitfire Wheels: F4 99a Radial Full Size:54mm it serves up a balancedOverview KEEPING THE UNDERGROUND LIT Ride the fire with the Spitfire Formula 4 Radial Full 97a Wheels. Designed with your favorite classic Spitfire Classic wheel designs and manufactured with the quality high performance, Formula Four urethane. Formula Four Urethane lasts longer, withstands more abuse and performs superior to all other wheels. Designed to combine all the desired properties of a performance wheel without sacrificing any one attribute