bobcat m600 m610 tires size recomendation

[signdude]

i have a stock m600 with the factory rims with old truck looking snow tires. i would like to get new tires for it and would like to go a little bigger without buying new rims. i just don't want to order a size and have them rub. thinking like a 8.5x27 15. anyone have a recommended size they have used on this machine? thanks