I replaced the tires on my 2 ton truck, it had 9.00-22.5 that were about 39.5" diameter, my new tires are 10R-22.5, they are about an inch taller, I gained 5 mph and it now can do 50-51 mph against the governor.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy