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Removing the spare tire from a 1999 Ford F150 is simple. All you have to do is get under the truck and unbolt the spare tire.
P235/75R15
Very carefully!
P235-75r15
P235/70R16
32 front 28 rear
33#
33.1250 33.1250
235/75/15
40 at the front 36 at the back
32 front 28 rear
Most common tire size for a Ford F150 is 275/65-18, but check your vehicle manual, and look up tire size. Or if you don't have a vehicle manual, you can always call a local car dealership or a local tire shop, and ask them.