need to put some new tires on the new to me 400 got it in pieces but it is now up and running again.

i would like to put kenda bear claws on all the way around but cant find them in the right size to be able to fit that 10 inch rear rim so i was wondering if it is possible to just change rims or just what my options are. seems to be a wealth of info on this site so i figured that i would ask.

thanks Justin