Strengthen your Spider 9 housing with our Spider 9 Truss. This laser cut, CNC formed, 4130 truss provides superior strength with virtually no compromise to ground clearance. At .120 thickness, were keeping the weight down as well. This truss is designed specifically for 4″ 101.6mm Pro Series Spider 9 Housings with a Ta/Tb range of 21″-29″ 533.4mm-736.6mm. This truss is not heat treated. Spidertrax recommends the heat treated option for all rock racing and competition based applications.