I remember seeing this question before...for what it's worth, here's a quote of a sensible-sounding answer from an old thread:
Hooligan wrote:
Posted By: hooligan on 05/28/10 06:04pm
Mike: The 235/80R22.5 is a Michelin size. The equivalent by other mfgr is 245/75R22.5, same specs, diameter and loading. Load Range G
My MH came with the XRV 235/80R22.5 and I went to the Goodyear G670RV, 275/70R22.5. Basically 1/2 inch bigger diameter, an inch wider tread and 2000 lbs more load capacity. (Load range H)
Going to a larger tire, check Dual spacing and clearance in the wheel well.....
Each tire manufacturer website will have the specs for their tires. Size, diameter, rpm per mile, load, width and spacing requirements to compare. (the 255/70 is slightly smaller diameter but is available in Load range H for highly load rating)
..choices.....
