How do you determine optimum tire size? - Ranger-Forums - The Ultimate Ford Ranger Resource


Wheels & Tires Semi-Tech General discussion of wheels and tires for the Ford Ranger.
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Old 07-06-2008
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Icon5 How do you determine optimum tire size?

I've been looking at new tires and saw Sonic04Edge's thread on how he actually gained mpg's by increasing his tire size. I have a 3.0 with the 4R44E auto tranny and 4.10 gears in the back on 245/75/R16, so basically the same as Sonic04Edge's. Could I expect to see similar results if I went with the 32x11.5x15 tires as well? I know my current tires are too small because my RPM's at cruising speed are too high. I think a larger tire would get my RPM's down to where they should be, and look cool too. Any one with ideas?
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Old 07-06-2008
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Theoretically you can reduce RPMs but it will cause your engine to work harder. The weight of the rotating mass will over come the reduced RPMs.
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Old 07-06-2008
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Well, at 60mph, I'm am running at 2500 RPM's in overdrive and I should only be at around 2000. Just trying to figure out where I could make changes to get some lower RPM's. I already want to change tires, why not go bigger, right?
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Old 07-06-2008
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I'd say do 33's. I loved my 3.0 with 33's and 4.10s, I was pulling 17-18mpg easy.
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Old 07-06-2008
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I'm looking for maximum tire minimum effort. I thought that to fit 33's, I would either need a bodylift, or some serious T-bar tweeking. Did you have a lift and/or a T-bar crank?
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Old 07-06-2008
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Old 07-06-2008
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I had just a spindle lift
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Old 07-06-2008
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think about your transmission.... that 4r44e has a hard time with larger tires until it is reprogrammed. mine had larger tires on it when i bought it (265/75/16) and it shifted pretty hard. luckily for me the ford place fixed it cuz of the warranty.... but after the reprogram it worked great. i have the same engine/tranny you do and the engine does fine with 32s... trans just didnt workout so well until i got it fixed.

OH....tranny doesnt like 35s btw
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Old 07-06-2008
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Thanks Crunchy for that chart. Yeah, when it comes time to change I may upgrade a little bit to 265 or 285's. Right now I'm on the high end of RPM's on that chart ideal for towing and the like. I'm also looking into a tuner so that would help me out too.
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Old 07-06-2008
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I'm pulling 18.5 mpg with 75% city driving. I have a 3.0 auto, 4.10s and 32s as well.
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