Does anyone know what the inter-axle ratio is for the B2650? I wanted to see if i could use Galaxy Might Mow R3 tires in the same size as my current R4 tires. They have just a slight difference in rolling circumference. It would allow me to use the same rims unless there is a reason not to use the 23x8.50-14 and 12.4-16 rims with a turf tire?