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  #1  
Old 06-18-2013, 02:28 PM
mcampbell mcampbell is offline
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So, I am trying to decide between 305/55/20 or 275/65/20's with a leveling kit. Tons of you have done this, what did it do to your mpg's? Did you have to get your spedo recalibrated?

Thanks for your help

Last edited by mcampbell; 06-18-2013 at 02:35 PM. Reason: wrong size! my fault
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Old 06-18-2013, 02:36 PM
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Well you're essentially comparing to completely different size tires.... a 305/55/20 is about 33.25" tall which is only slightly taller than stock. Your MPG will drop slightly because of rolling resistance but it won't be anything drastic. The other thing you haven't answered is what kind of tire you're going with. Weight plays a huge part in MPG as well. So if you're going with an MT your MPG will be worse than with an AT because of the weight difference.

A 285/65/20 is about 34.5". Again, depending on the tire it's kind of hard to tell you what you're going to get. I have 35x12.5 Toyo MT's and I'm getting about 16 MPG average but I do a lot of highway driving (plus I have a tuner).

Without more information it's hard to tell you exactly what to expect.

I did recalibrate my speedo with my tuner. I'd definitely recommend doing that because it affects your odometer as well (and therefore your trip meters). So any calculations you do manually to find your MPG afterwards will be wrong....

Another heads up, you can't fit a 305 wide tire on the stock rims if that's what you're expecting to do. You'll rub the UCA.
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Old 06-18-2013, 03:36 PM
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I am looking at the terra grapplers. Something more aggressive, but still in an AT. I know they are different sizes. My debate is to go taller (275) or wider (305).

I am surprised the tire dealer didn't mention anything about rubbing. I know this is a different topic, but I had 12.50's on my 03 ram without any problem on stock rims.

Outside of a tuner, is the recalibration something the dealer would have to do?

Thanks for the quick response
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Old 06-18-2013, 04:00 PM
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Okay, well a Terra Grappler isn't near as heavy as an MT. So as I said the 305/55 shouldn't hurt your MPG too bad from stock. It's just the extra weight and rolling resistance that you'd have to consider. I'd guess you're looking at a 1 MPG drop max. But yes, you will need 1/4" spacers in order to make them work. The suspension set up on the 4th gens is much different than your 03 so you can't really compare it to that.

With the 285/65's you're probably looking at around a 2 MPG drop max. Those you will be able to fit on the stock wheels with no spacer.

As far as the recalibration goes I believe the dealership can do it. I've heard they have limits on how big of a tire they can calibrate it to though. Can't remember exactly what they are off the top of my head.... Hopefully someone will chime in with that info for you. Otherwise you can probably find it using the search engine. Another option would be the Hypertech Speedometer Calibrator. I think they're around $250 (shot in the dark)
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Guide to Leveling & Wheel and Tire Sizing for 06+ 4wd Ram 1500's
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Old 06-18-2013, 04:04 PM
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Thanks for your help, I really appreciate it.

My assumption is that I will experience rub at full lock, based on what others have said on here. I can handle that until I can get spacers. I think my mind might be made up unless anyone comes up with some other suggestions.
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Old 06-18-2013, 04:07 PM
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No problem!

Ya, typically putting bigger tires on will yield a little bit of rubbing at/near full lock. Definitely worth it IMO though. Because your truck will look bad ass with the new tires and how often do you really get to full lock? Parking is really the only time so you're going slow...

Be sure to post some pictures of your truck once you get the tires installed.
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8" BDS Long Arm Lift with Fox 2.0 Shocks | Dual Fox 2.0 Steering Stabilizer | 37x13.5 Toyo MT's | AMP Powersteps & Bedstep | Bakflip G2 | Mag-Hytec Rear Diff Cover | 5000K Morimoto HID's (lows and fogs)
H&S MiniMaxx Custom Tuned | 4" Flo Pro Stainless TBE | Sinister EGR Delete | ARP 425 Head Studs | 4.56 AAM/Yukon Gears | S&B Intake | Instagram: @brandonjansen
Guide to Leveling & Wheel and Tire Sizing for 06+ 4wd Ram 1500's
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