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  #1  
Old 09-12-2010, 03:10 PM
MEDIC7 MEDIC7 is offline
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Default Looking to replace stock 20s, help!!

I have stock 20's on my 2007 Ram Bighorn. I was looking to replace the stockers with 18's to increase my gas mileage. I was wondering if someone had an idea on the correct size to put on?

The reason I'm doing this is I'm starting a new job and having to drive a litte farther and try to squeeze some more mileage out.

Thanks
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Old 09-12-2010, 03:32 PM
City Slicker City Slicker is offline
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If you want to maintain your MPG, don't go any wider/heavier than the stock size. Offset also plays a role in how wide your tires will stick out.

http://www.tirerack.com/wheels/tech/...jsp?techid=101
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Old 09-12-2010, 05:41 PM
MEDIC7 MEDIC7 is offline
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Ok from what i've been reading on the tirerack.com website they show a recommended size of 285/60 18 on a 2007 dodge ram 1500 4wd quad cab. is this right?

I'm not for sure.

Help!!!

Thanks
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Old 09-12-2010, 08:10 PM
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There's too many sizes out there to say which is best, but that's a good size. You'd gain a little extra height with only going .39" wider.
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Old 09-12-2010, 08:14 PM
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When picking your wheel, it will be good to know what your stock wheel offset is too.
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Old 09-12-2010, 08:45 PM
Allstate48 Allstate48 is offline
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I'm not sure, but, if you go to a smaller tire, won't that be a lower gear ratio? And what won't help your mileage. Good Luck Doug
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Old 09-12-2010, 09:22 PM
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Quote:
Originally Posted by MEDIC7 View Post
I have stock 20's on my 2007 Ram Bighorn. I was looking to replace the stockers with 18's to increase my gas mileage. I was wondering if someone had an idea on the correct size to put on?

The reason I'm doing this is I'm starting a new job and having to drive a litte farther and try to squeeze some more mileage out.

Thanks
Okay, I'm confused. How would going from 20's to 17's increase the gas mileage?
I could maybe see it if you stayed the same overall tire diameter, and got a narrower tire, but that's the only way. Even if that got you 2mpg more, it wouldn't make finacial sense to buy new tires and rims for that reason.
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Old 09-12-2010, 09:30 PM
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The size of the rim does not change the gas milage of the truck. It is the size of the tire that changes the MPGs. Now this wont be significant changes or anything to your MPG. To be honest I have 35" tires on my truck and I am getting over 13MPG as of right now. I had 33" tires and I was getting around 12MPG which does throw me for a loop as well at first haha.

Like you just said above my post, it is not going to be worth buying new rubber and rims.

As it was said before the smaller tires would change the gear ratio of the truck. It will increase the gearing which in turn will hurt the gas mileage. With the bigger tires it is supposed to lower the gearing. Really you shouldn't worry about the tire and rim size since there are better things to do to save you some MPGs.

If you start to mod the engine then you will see some MPG improvement. Add an intake, exhaust and a programmer and that will help out a lot. This helps if you keep your foot out of it haha. Also freeing up the motor with a larger underdrive pulley and electric fan would help out as well!
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Old 09-12-2010, 09:35 PM
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I agree with all of that ScatPak07 and will also add something that I have seen on other forums.
Any significant change in tire diameter will make you speedometer read differently, we all agree with that, but what some forget is that if your speedo is off, so in you Odometer.

In your case Scat, if you didn't recalibrate for the different diameter tires, that explains why you observe better mpg now.
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Old 09-12-2010, 09:40 PM
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I'm one step ahead brother haha. I have the Diablosport Predator and I have changed the tire diameter once I put the tires on. I used my GPS to see if the speed was the same as the trucks reading. I agree though if you do not change that then the trucks info is pretty much useless haha
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Performance- DS Predator w/91oct Tune, Gibson CB, BFI CAI, E-Cutout, Jet Stream Scoop, 180 Tstat, Optima Yellow Top.
Suspension-12"Lift, 6" Fabtech Lift w/ Steering Stabilizers & Dirt Logic Shocks, Bilstein 5100s, Oasis Ram Head Diff Cover, 3" PA Body Lift, SSBC Big Brake Kit
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Exterior- 20" Moto Metal 951, 40" BFG KM2s, N-Fab W2W Black Side Steps, Recon Black Headlights & Tails+3rd Brake Light & Light Bar, Hella 500s, T-Rex X-Metal Black 1pc Grille, Tints All Around, Painted Bushwacker Pocket Flares & Door Handles & Mirrors, LoRider Tonneau Cover, Hornblasters Train Horns, Iron Bull Bumper w/PIAA Fog & Driving Lights
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