Our volunteer fire department has a m920 that we use to haul water it currently has 11.00r24 on it most of the tires are all dry rotted and cracked we have not been able to find and replacement tires either. Had a tire supplier send us some new tires and rims not sure of the tire size but the rims are 22.5 when trying to install them they hit on the drums. Now I've seen in some other threads that some people have ground the drums down for them to fit does anyone have any pics or tips before I start grinding on the drums