Spitfire OG Classics Mashup Wheels Set Blue Red 54mm/99a Ride the fire and burn through the streets with the Spitfire OG Classic Mash Up Blue/Red 99a Wheels. A classic and reliable street wheel from your friends over at Spitfire. Manufactured with a wider riding surface and cutaway shape with a 99a durometer for the perfect blend of speed, grip and slide. Designed with classic Spitfire detailing on both sides of the wheel. Remember to keep the underground lit! Wheels sold in sets of four.