A wheel adapter mounting high weight capacity truck wheels and tires on automotive hubs and spindles. The adapter mounts on a standard automobile five stud hub with studs on a 5 inch diameter circle. Clamping force of the five studs with wheel bolts tightened to a predetermined relatively high uniform torque at the factory secures the adapter to the hub making possible utilization of a conventional truck wheel with five studs on an 8 inch bolt circle for maximum load carrying capacity. The wheel hub bolts on the 5 inch circle studs are so tightened that torque loads due to braking and acceleration are transmitted between the wheel and hub by friction rather than any material shear load on the hub bolts. The wheel adapter is installed with a center opening light press fit on a wheel hub and radial loads transmitted directly to the hub with the bolt pattern not required to assume any additional loading.