Different Tire Sizes
Cargo Master
Joined: Feb 2004
Posts: 2,101
Likes: 60
From: N. Illinois
No mistake. I have an F-250 with factory 20's, and have an 18" spare, too. I have never seen a steel 20" wheel, and I don't think many would want to pay for a nice aluminum rim sitting under the rear as a spare. Besides, I think the aluminum rim, or chrome for that matter, would only pit, rust, or corrode up there catching all the road grime and salt. Most never use a spare anyway. Could it also be because a steel wheel in a 20" may not be as strong as an 18"?
By the way, be careful if you go 20's. I blew one out at 4,000 miles. It cost $285 for the tire. OUCH! Pretty stiff for one tire. On the Superduties, they sure look boss, though. I don't care for the F-150 20" wheels. They need to be shiny polished aluminum, or chrome. That argent look is stupid IMO.
By the way, be careful if you go 20's. I blew one out at 4,000 miles. It cost $285 for the tire. OUCH! Pretty stiff for one tire. On the Superduties, they sure look boss, though. I don't care for the F-150 20" wheels. They need to be shiny polished aluminum, or chrome. That argent look is stupid IMO.
Senior User
Joined: Apr 2006
Posts: 248
Likes: 0
From: Escondido, Ca
As long as the two tires are the same diameter, it does'nt matter. For example, 20's with a "50" may be the same overall diameter as 18's with a "70". Check the specs on both tire sizes to be sure.
