Different Size Spare
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
Ford says it is, and if someone has a drive train or suspension issue this will be just another "water in the fuel" kind of warranty exclusion.
Plus, these days, tire dimensions are becoming more and more critical. On AWDs, it's pretty crazy -- tires have to be within 1-2/32" in diameter so if replacing a damaged tire or if encountering uneven wear, one has to shave the offender down to match the diameter of the remaining ones. Even on truck and commercial suspensions, manufacturers are getting very precise about what they require, with the implication that any deviation becomes a warranty exclusion. It isn't just Ford either.
Plus, these days, tire dimensions are becoming more and more critical. On AWDs, it's pretty crazy -- tires have to be within 1-2/32" in diameter so if replacing a damaged tire or if encountering uneven wear, one has to shave the offender down to match the diameter of the remaining ones. Even on truck and commercial suspensions, manufacturers are getting very precise about what they require, with the implication that any deviation becomes a warranty exclusion. It isn't just Ford either.
It's your truck, so you should do what makes you happy. But I think you're better spending your time concerning yourself with stuff that actually needs to be concerned about.
Postmaster
Joined: Apr 2008
Posts: 4,724
Likes: 4
From: Rogersville, TN
If the spare is used as a spare is intended(to get home or to a tire store) then it shouldn't cause any issues at all, including warranty. No different than a donut spare in a car. You use it to get where you can fix the tire, not drive it 50k miles.
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