16.5 x 12 with 8 on 6.5 bolt pattern (IIRC 3-3/4 backspacing). Still mounted in my 44's, I'm going with bead locks since I'll be doing more than just mud next year. I had a bad experience with some 16.5 x 9.75's a few years ago and lost a 38" tire because I forgot to air back up. These cost $125 ea. new, I'm asking $350 OBO for all four. Shipping is not included (keep in mind these are about 40# a piece with the 1/4" thick center section). They're located in Agawam, MA 01001 Looking for H1 rims... even swaparoooooooo!!!