Have My Dads 1986 F-150 Lariat. Just Put On A New Set Of Chrome Spoke Wheels(beautiful).want To Go To A Michelin 255-75-15 Ltx-m/s.
Door Jamb Plaque Calls For 235-75-15. I Know That The Speedometer Will Be Off, But Will This Cause Any Other Problems? Thanks

 

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A little less gas mileage....heavy tires and more resistance from more rubber on the road.

 

I have the same size tires on my truck but Cooper H/Ts. it did hurt my gas milage a little but looks better. And slightly slower acceleration. my speedo is off by a little more than 5 going 60 just so you know.