What would the factory tire size be for a 94 F-150 4x4 offroad?

I have 31x10.5x15 on it now and was just wondering if that was Stock or taller than stock. Just for speedo correction calculations.


Thanks

 

Look inside the door jamb. The stock tire size should be on the sticker.

Assuming the stock tires are same as mine (88 4X4).. the 31's are just a tad bit bigger.

 

235/75-15 should be the stock size unless the truck came with a special factory package. 31's are 2 inches taller which equates to a 5mph error on the speedo but what's worse is they turn 49 times less per mile so your fuel milage calculation will look real bad until the speedo and odometer are recalibrated.