[Dave92270]

that is interesting... Maybe my Hummer dealer is dumb, but when I was ordering my 285's (33") from them while ago, they suggested to keep the 265 (32") as a spare. I rejected the idea and got all 5 the same size, however I noticed the dealer actually sells some of their H3s with non-matching/smaller tire as a spare. I saw at least one H3 on the lot with four 285's mounted and 265 spare.

My guess is that slightly smaller (let say 1" difference?) spare is OK as long as one doesn't have to drive too far or for extended period of time?