Hold the bus!You can safely go from 20.5x8.0-10 to the 20x8.0-10 tires.
Opens up a lot of possibilities.
I think you need to re verify the side walls of each tire:I have just purchaced a 29-12.50x15 Carlisle Multi Trac and Bridgestone 20.5-8x10 Pillow Turfs.
What size rims do you have? AFAIK, the B7100 came with either of two choices: Ag tires on 12" diameter front rims and 16" diameter rear rims.I have just purchaced a 29-12.50x15 Carlisle Multi Trac and Bridgestone 20.5-8x10 Pillow Turfs.