I put the ProComp AT 33x12.5x17 on my 17" stock rims. How does this effect the odometer, and how should I now calculate my estimated mpg's?

 

I also have the ProComp 17s on my supercrew. Took a few speed readings with my GPS going 70 MPH and the speedo was right on. The tires are not really much taller than the stocks so I don't think it makes much difference. GPS didn't think so anyway.
Just my opinion.
slowguy

 

NEW TIRE/old tire * speed = actuall speed



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1998 Ford F150 4x4 OFR
Moonlight Blue
Short Bed Flareside
Dual exhaust Staight Pipe
Hypertech Chip
Fiberglass Tonuea Cover

 

what numbers do I use in the new tire/old tire equation?

thanks, I may put the gps in the truck and see what it says as well.

 

were you able to fit the tires on the stock rims without lifting the truck? how does it look?

 

You use the size like stock 17's (rims) have 31.7" tall tires and ur new ones are 32.7" tall so 31.7/32.7 * XXMPH = XXMPH


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1998 Ford F150 4x4 OFR
Moonlight Blue
Short Bed Flareside
Dual exhaust Staight Pipe
Hypertech Chip
Fiberglass Tonuea Cover
3" Performance Acc. Body Lift


DON'T JUST DODGE IT STROKE IT FORD!!!

 

Did the Pro Comps baloon out any on the stock rims? I know those tires are supposed to be fitted on an 8''-100'' wheel and the stock wheels are 7 1/2''. If you have any pictires can u post them please? Thanks