We have developed a Billet Big Wheel kit for the Pro Stock Inc rear asphalt suspension that uses 9.5" rear wheels and have pre-drilled big wheel holes in the rails. Our 5.5" billet aluminum wheel assemblies are lighter than the 3.250" pin wheel sets and allow for a flatter footprint leading to better 60' times. Kit includes (4) billet wheel assemblies ready to bolt on using exsisting hardware. Kits are available in naked aluminum or black anodized. 9.5" billet rear wheels are also available.