Replaced 4 225 75r16's on my 2007 E150 with 245 75r16's, but not the spare, it remains a 225 75r16. Can I use this in an emergency situation?
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Tire size calculators are extremely helpful tools. https://tiresize.com/calculator/ is just one of the many sites. Putting your two sizes in I see they are 27 revolutions/mile different. There 2 scenarios that each take their own special rules.
Flat on Drive Axle
If your axle is an open differential it will handle this, but if it's a limited slip diff then swap a good tire from the other axle and put the different sized spare on that axle.
For example, on a rear wheel drive with a limited slip diff, the spare would go up front.
Flat on Non Drive Axle
Doesn't matter too much, just might handle a bit odd especially if it's up front. You also might notice some pulling to the shorter tire, but with modern cars and power steering you probably won't feel much different.
Mr. Anderson
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