Spitfire Wheels: F4 99a Conical Size:54mm INSTEP FLEX ZONE – The

INSTEP FLEX ZONE – The Instep Flex Zone functions to maintain natural ankle flexion in your boot

Available in multiple sizes

and black and red hardware

heat-resistant urethane TrypoCore

what more do you need

Spitfire Wheels: F4 99a Conical Size:54mm INSTEP FLEX ZONE – TheOverview KEEPING THE UNDERGROUND LIT Ride the fire with the Spitfire Formula 4 Radial Full 99a 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