22.5" tires range from about 36" - 41" diameter
avoid 2-piece and split ring rims like the plague because getting a tire shop to change them is becoming quite hard due to safety issues
if you are bound to do your own centers Dayton makes 22.5" centerless rims that replace the older 20" Daytons that came on school busses and dump trucks etc and fit directly onto the original Dayton 5 spoke hubs
good luck with your project
I'm partial to the 1100x20 Michelin XLs but that's because I used to drive 5 tons that had those. The 11R22.5 tires are found everywhere and relatively cheap.
Thanks for the replies!
Oh yeah, not going with split ring rims - I had to remove the worst offenders off this bus; Firestone RH5 "widowmakers". That was a thrill I don't want again! I'm assuming in spite of being 2 part, the Humvee rims (or military 20's) are safe as they're bolt together and have multiple points of failure rather than one point of failure with the split ring.
This bus never had Dayton spokes, only the heavier 35+ ft., class 6 and up, GMC buses of the era did as an option. Daytons are cool though, very rugged.
I'm thinking I may go with 22.5's. about 200lbs per wheel + adapter + tire for military 20's seems a bit much. I've found 10x285 to 8x6.5 adapters for a great price. My main worries...
- The sheer mass of 22.5's on a Dana 60. Is it too much for something that isn't a mall crawler on alcoas? I keep receiving conflicting answers on this. I currently have the later OEM shafts which do NOT neck down at the splines (no relatively weak area). Are chromoly shafts or 35 spline a nice upgrade or absolutely necessary? Granted I'm not wheeling this thing hard; some occasional mud and bumpy, rocky trails, but mostly fire service roads and logging roads, no rock crawling in something this size.
- Suppose they'd also ride rougher than the humvees.
- Rear driveshaft is 1410, that's also the largest I can go up front. I have 4.56 gears and intend to keep it that way. Would 22.5's necessitate a regear and/or larger driveshafts? I spoke with some guys at Tom Wood's who said 37" would be absolutely fine with the current setup, but couldn't say much about 41" tall tires on 22.5's.
- Is losing beads/inability to air down a hindrance even with mild off-roading for 22.5's? I will also likely be running a DRW rear with the 22.5's as I cannot find any 22.5" rims suitable for SRW use that isn't for some massively wide on-highway single.
Some advice, especially with the first question, would be much appreciated. Thank you.