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ddaniels 08-28-2013 12:34 PM

Tire size vs MPG
Greetings to all. Newbie here and I've already posted in the newbie section. I have a 2000 1500 I purchased about a month ago and it has tires on it that are a bit undersized (225/70R16). I was thinking about getting some 20" rims and bigger tires to make it look nicer, but I read something yesterday about the disadvantage of worse mileage with larger rims. Can anybody here shed some light on this, or have personal experience to share? Also, I have the flat chrome clad rims on there now and was wondering how big a tire I can get away with on there. The folks at Tire Discounters told me the largest I could go is 245/75R16. Has anybody gone bigger with those rims? Thanks for any help.

the persuader 08-28-2013 02:09 PM

You should be able to step up to a 265/70/16 or a 265/75/16. You will most likely get lower gas mileage.

dodge man 08-28-2013 02:20 PM

In theory a taller tire will give you a better gear ratio for better fuel mileage, but depending on how your truck is geared, it can hurt you fuel mileage in town. They are also heavier, catch more air, so in the real world, they usually hurt you fuel mileage.

jabba974 08-29-2013 08:44 PM

dodge man is correct, the taller the tire, the less easier it is to roll down the road, however, it also takes more power to get moving.... A couple things that affect milage when it comes to rim and tire combinations is the hieght and weight of of the wheels...
As far as what fits, the diameter of the rim doesnt matter...A 20 inch rim will work no problem, the diameter of the tire is what matters...

the persuader 08-31-2013 09:18 PM

It's not the size of the rim, but the added weight. A heavier tire/wheel package hurts fuel economy.

ddaniels 09-02-2013 10:20 PM

I'm currently getting approx. 14 mpg +/- around town. It's a 2000 short bed, 2-wheel drive with a 5.2 magnum engine. Does that sound about right?

ddaniels 10-17-2013 12:03 PM

Update for anybody interested: I went to 20" rims with 275/55R20 tires and lost approximately 2mpg fuel economy. After a couple weeks, and then deciding they looked too big, I went back to the 16" rims but replaced the 225/70R16 tires with 265/70R16 tires (used) and the mpg is back where it was around mid 14's. The tires are only about 1" shorter than the 20" ones they definitley look better than the small first set I had.

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