30.5x32IJIJ Are you trying to run on a lake or somethingIJ I had 24.5x32 on an M2 with wheels that allowed running between rows. You might want to consider custom wheels if you have 30 corn or corn stubble will do a number on those tires. For my money, the M2 was so far ahead of the competition that nothing would compare with it. let us know how it works out for you. By the way, I also upgraded from a C2. My son didnt like the M2 because he couldnt watch his daddy stick his arm through the hole in the side of the cab to engage the separator. But when he got old enough to run the M2, he was glad we had it. Tom Russell