Question about rims on a Yard Machines tractor

I just bought a Yard Machines by MTD. It is one of the larger ones with high and low with a 7 speed. and 18.5 B&S engine..
The rims on the left side have the valve stems on the inside and the rims on the right side have the valve stems on the outside. And the rims are not on backwards.
Anybody have any idea why it would be that way?
Bob T

Attached Images

• P1030053.jpg (157.5 KB)
• P1030054.jpg (107.9 KB)
• P1030055.jpg (144.5 KB)
• P1030056.jpg (143.1 KB)
• P1030057.jpg (97.7 KB)
• P1030058.jpg (108.4 KB)