1990 GM P-30 Motorhome with Ricksons 19.5� X 7.5� Wheels and 245/70R19.5 Tires in Front. 19.5� X 6� Powder Coated Steel Wheels and 8R19.5 Size Tires in the Rear (6). Stainless Steel Simulators on all outside wheels. (Note: In this case, the 245 size tires were selected for the front for both the added weight capacity (4,500 Lbs. per tire) as well as the wider stance than the narrow 8R19.5s, for better handling and steering).