This is a 15 inch White modular steel trailer wheel that mounts on standard 6 lug trailer hubs. The 5 Lug Hub Pattern is standard in the trailer world. The most common trailer tire size seen mounted to this rim would be the ST205/75 15 trailer tire size.
15 inch by 6 inch 5 Bolt (5 on 4 1/2)
Carrying Capacity 2050 per rim