ddawg2184

Ok i kept my stock steel wheels on my 94 f150 xl 4x4. I put a set of general grabber at2 31's on . I was wondering how much this might set my speedo off at 55?

NaViG8R

What is the stock tire size for your truck? It will be in the drivers side door jam. I believe stock tire size is real close to 31" tall. It looks like the most common size was 255/70-16. If this is your stock size, it works out to be 30.05" tall, that 1" in height won't make much of a difference on the speedo at all. If you had the 265/70-17 versions, those work out to be just over 31" (31.6") tall, so your current tires would be a tad shorter in height, and again, shouldn't be noticable on your speedo. For what its worth, I just installed 33" tall tires (305/70-16) and checked my speed using an accurate GPS and my speedo isn't off by any measureable amount at all. Makes me wonder how off it was before I installed the larger tires.

~Mike..............

ddawg2184

my original tire size was 235/65/15. Im still on the stock wheels .

ddawg2184

man i am so dumb i have a tom tom gps lol

NaViG8R

235/65-15?? And this is 4X4? I had bigger stock tires on my Explorer. And this is what is in your door correct? Because a previous owner, or a tire shop might have down sized the tires without your knowledge. Those tires are 27" tall, so yes, your going to see a difference in your speedo.

~Mike.................

Etdesign

Welp, for my 38's the speedo is off between 7-10 miles per hour...

Viper1

I have a 2004 F150 xlt 4x4 with a 4.6 with 235-75-16, stock rims 16" tear drops. Iwant to put 285-75-16s on my truck. Will they fit properly on my stock rims, really dont know the rim width. this is the old body style 03 model

mitchalvin

I believe you mean 235/75 15, if this is the case you will be off by about 4 MPH at 65 meaning that while your speedometer reads 65 you will be traveling at 69. There is a post about changing your speedometer settings either on the how-to or the forum for your truck.

Viper1

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