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Old 02-03-2014, 11:26 PM   #1
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Impact with mud terrain vs all terrain

Thanks to the information in this forum I talked myself out of 35" tires. I drive 50 miles round trip and I have an 07 JKU auto with 4:10 gears. I don't want to deal with the sluggish performance and lost of MPG, etc..

My question is... I currently run BFG AT's 285/70/17. If I stick to a 285/70/17 or go to a 33/12.50/17 Mud tire like the MT Baja is that going to have the same effect as a 315/70/17 Duratrac in terms of sluggish performance and lost MPG? More concerned on the performance than MPG. MPG is what it is.

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Old 02-04-2014, 12:59 AM   #2
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The 315's are more like a 34" size and they are a MT as opposed to your current 285 ATs.

MT tires have more rolling resistance, noise and usually weight than the equivalent size ATs. So for the same size tire the MT will require more power and hence more gas. The bigger the tire diameter you get the same impact on power and fuel economy. If you are concerned about power stay with the 33/12.5-17s. That way you are only getting dinged by the tire design and not by tire size.

Everything else being equal, tire radius will impact your performance the most.

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Old 02-04-2014, 08:02 AM   #3
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The 315's are more like a 34" size and they are a MT as opposed to your current 285 ATs.

MT tires have more rolling resistance, noise and usually weight than the equivalent size ATs. So for the same size tire the MT will require more power and hence more gas. The bigger the tire diameter you get the same impact on power and fuel economy. If you are concerned about power stay with the 33/12.5-17s. That way you are only getting dinged by the tire design and not by tire size.

Everything else being equal, tire radius will impact your performance the most.
Duratracs aren't a MT and though I haven't checked their weight, the bajas in 33 may be the same weight as the 315 Duratracs which are a relatively light tire. I'd check that!
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Old 02-04-2014, 08:10 AM   #4
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Duratracs aren't a MT and though I haven't checked their weight, the bajas in 33 may be the same weight as the 315 Duratracs which are a relatively light tire. I'd check that!
I checked and the Baja mtz 33 17 is 63 lbs and the duratrac 315 17 is 60 lbs. It's not a lot but that difference and the rolling resistance of the Baja mtz may very well negate the performance effect of the larger diameter duratrac , no?
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Old 02-04-2014, 10:19 AM   #5
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I checked and the Baja mtz 33 17 is 63 lbs and the duratrac 315 17 is 60 lbs. It's not a lot but that difference and the rolling resistance of the Baja mtz may very well negate the performance effect of the larger diameter duratrac , no?
Correct.
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Old 02-04-2014, 10:24 AM   #6
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The diameter of the tire has far more effect on performance than the weight.

The weight is not insignificant but it's not going to make a 33" tire feel like a 35" tire.

In a daily driver, I would personally avoid any kind of mud tire and stick with an all terrain of some kind. They wear faster, they are noisy, and many of them don't handle water soaked roads as well as a good all terrain.
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Old 02-04-2014, 10:57 AM   #7
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One other thing to consider if you are concerned about performance. If you don't already have consider getting the Superchips unit it does wonders for the 3.8. It will make up the difference in load created by either of those tires.

As always tires and lift are a big tradeoff between on and off-road performance. There are some outstanding trails in AZ but if you don't frequent them, then the AT may be a better choice.
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Old 02-04-2014, 12:28 PM   #8
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What will give you more of a sluggish response, is your tires roll resistance, additional tire weight, and larger diameter.
Also your braking capability will be effected negatively!
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Old 02-04-2014, 02:08 PM   #9
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but your CDI value is improved


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Old 02-04-2014, 03:33 PM   #10
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I run 315/70/17 Hankook Dynapro MT's. The company shows them as a 34.6". They're infinitely quieter than the BFG MT's I had. As quiet as any AT I've had as well.

This test is about 2 1/2 years old but still a good one: Mud Tire Shootout First Place: Hankook Dynapro MT - Four Wheeler Magazine
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Old 02-04-2014, 11:08 PM   #11
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Ok, so the 285/70/17 Duratracs are 32.8" - same size as the BFG ATs - and weigh 2 lbs less at 54lbs. This may be the way I go and my best option. (?)

Correct me if I wrong , but I thought the superchip just re-calibrated the shift points and fixed the computer gas mileage .., no? Is it worth getting?
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Old 02-05-2014, 07:59 AM   #12
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Ok, so the 285/70/17 Duratracs are 32.8" - same size as the BFG ATs - and weigh 2 lbs less at 54lbs. This may be the way I go and my best option. (?)

Correct me if I wrong , but I thought the superchip just re-calibrated the shift points and fixed the computer gas mileage .., no? Is it worth getting?
The Flashpaq is a tuner which you can use to install tunes that increase HP and Torque.

I do not have any experience with MTs but I have 285/70r17 Duratracs and really like them. They look much more aggressive than the BFG ATs.
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Old 02-05-2014, 10:28 AM   #13
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Yeah just look at actual overall diameter & weight & width
I have 33"/12.50/17 but they are heavy but it's what I wanted
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Old 03-04-2014, 10:37 AM   #14
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If you have a Jeep and it is lifted for trail riding
then you shouldn't be concerned about MPG etc...

The thrill and enjoyment of trail riding/rock crawling
far out weigh the down side of loud tires, poor gas
mileage and tire wear.
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Old 03-04-2014, 12:57 PM   #15
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Okay, I need to ask for help. I have literally spent hours looking at The threads and am still confused so I apologize for my stupidity. I'm currently running stock 255– 75R 16's. I have a 2012 JK Unlimited strictly stock minus my Gobi rack and a few other minor detail changes and need to upgrade to a different tires. At this time I want to stay with my stock rims but need to upgrade to a better tire My off roadiing is limited to gravel and fire roads as in Connecticut there are not many choices of than that. part of my problem is converting the numbers on my stock tires too when I hear about people going for example, stock rims no lift, no leveling kit with 33 duratracks tracks. I am wondering if when I read these threads people are starting with 275 –. ....
So after all this my question is if I want to go to what is known as 33 's no leveling kit no risers no spacers what would be the number for tire that will fit my stock rims. PS. Down the road I will be lifting a little bit but would still stay with the smaller tires. Thanks for everyone's consideration and help ,
all the best. Robert.
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Old 03-04-2014, 01:11 PM   #16
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225/45r16 = 24x8.9r16
225/50r16 = 24.9x8.9r16
225/55r16 = 25.7x8.9r16
225/60r16 = 26.6x8.9r16
225/65r16 = 27.5x8.9r16
225/70r16 = 28.4x8.9r16
225/75r16 = 29.3x8.9r16
235/55r16 = 26.2x9.3r16
235/60r16 = 27.1x9.3r16
235/65r16 = 28x9.3r16
235/70r16 = 29x9.3r16
235/75r16 = 29.9x9.3r16
235/80r16 = 30.8x9.3r16
235/85r16 = 31.7x9.3r16
245/45r16 = 24.7x9.7r16
245/50r16 = 25.6x9.7r16
245/70r16 = 29.5x9.7r16
245/75r16 = 30.5x9.7r16
255/50r16 = 26x10r16
255/60r16 = 28x10r16
255/65r16 = 29.1x10r16
255/70r16 = 30.1x10r16
255/85r16 = 33.1x10r16
265/70r16 = 30.6x10.4r16
265/80r16 = 32.7x10.4r16
275/45r16 = 25.7x10.8r16
275/70r16 = 31.2x10.8r16
285/75r16 = 32.8x11.2r16
295/75r16 = 33.4x11.6r16
305/70r16 = 32.8x12r16
315/75r16 = 34.6x12.4r16
345/75r16 = 36.4x13.6r16
365/75r16 = 37.6x14.4r16
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Old 03-04-2014, 01:46 PM   #17
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Old 03-04-2014, 07:56 PM   #18
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I've driven a total of about 32k miles on the stock 18" Sahara wheels / Bridgestone Dueler AT tires combo across three JKUs (2008, 2011, 2013). At about 800 miles on the 2013, I replaced the stock wheels & tires with Rubicon 17" stock wheels & Goodyear MT tires. (Same tread width and approximately the same OD, I believe.)

I was concerned about increased road noise & diminished wet traction, but haven't noticed much difference either (after about 9,000 miles, including a 3,500+ road trip). I drive mostly on pavement (sadly), but in a variety of configurations (windows up, windows down, hard top, soft top, no top). I don't pay a lot of attention to MPG, but that hasn't changed much, either.
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Old 03-04-2014, 08:55 PM   #19
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I run 315/70/17 Hankook Dynapro MT's. The company shows them as a 34.6". They're infinitely quieter than the BFG MT's I had. As quiet as any AT I've had as well.

This test is about 2 1/2 years old but still a good one: Mud Tire Shootout First Place: Hankook Dynapro MT - Four Wheeler Magazine

This is my next tire
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Old 03-04-2014, 09:28 PM   #20
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I had a BFG AT on my TJ and it was loud. I now have Pro Comp MT2 on my JK and quieter.
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Old 03-04-2014, 10:35 PM   #21
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Tires is a matter of need, and choice. What is your priority, DD highway dry roads, snow and ice, back in the woods in the mud, rock crawl, and the need just goes on and on.
Is MPG a issue, road noise, sluggish response, lack of braking, plus wear and tear on your front end steering components, and power train. Does a rougher ride impact your decision?
Or does none of that really matter, because you just want that massive 37s look!

There really isn't any one tire that does it all!

So the real key here is to evaluate your Wranglers need, taking into consideration the environment, that it will be used in.

For me, I like the Duratracs, 285x70Rx17s. They will still rock crawl, but yes the side walls aren't that great. They are relatively quiet, and not real heavy to effect mpg, power, and braking, plus they will perform O.K., when it comes to snow, and or a wet
pavement.

So this is my choice, but that doesn't mean that it will fit your needs!
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Old 03-05-2014, 09:59 AM   #22
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225/45r16 = 24x8.9r16
225/50r16 = 24.9x8.9r16
225/55r16 = 25.7x8.9r16
225/60r16 = 26.6x8.9r16
225/65r16 = 27.5x8.9r16
225/70r16 = 28.4x8.9r16
225/75r16 = 29.3x8.9r16
235/55r16 = 26.2x9.3r16.....

now how do I talk you into doing this for 18's???
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Old 03-05-2014, 10:06 AM   #23
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For multiple uses, I favor the all terrain!
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Old 03-05-2014, 11:59 AM   #24
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I also have 4.10's and am running BFG MT KM2's LT 285/70R17. I belong to an off-roading club here in Tucson and have been out on moderate to moderately difficult runs; some that are up to 100 miles away via highway. I have found that the 285's and the 4.10's give me a very good combo of performance and decent mileage (16-18). I've climbed with the best of our club and find that I easily run with them. I think going to 34's or 35's (which I could do with my 3.5 RE short-arm lift) would impact performance and add a lot of weight and strain on the rest of the running gear. Have to admit, the MT's are a bit noisy on the highway, but really do well out here in the desert washes and mountains. A lot of our club members do run AT's and do very successfully, so I'm considering them for future replacement (but that won't be for probably 3-4 years...not a dd.)
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Old 03-05-2014, 12:22 PM   #25
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How about doing that for 17s
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Old 03-05-2014, 12:53 PM   #26
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How about doing that for 17s
Same thing but take off 5 from the aspect ratio
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Old 03-05-2014, 01:59 PM   #27
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I also have 4.10's and am running BFG MT KM2's LT 285/70R17. I belong to an off-roading club here in Tucson and have been out on moderate to moderately difficult runs; some that are up to 100 miles away via highway. I have found that the 285's and the 4.10's give me a very good combo of performance and decent mileage (16-18). I've climbed with the best of our club and find that I easily run with them. I think going to 34's or 35's (which I could do with my 3.5 RE short-arm lift) would impact performance and add a lot of weight and strain on the rest of the running gear. Have to admit, the MT's are a bit noisy on the highway, but really do well out here in the desert washes and mountains. A lot of our club members do run AT's and do very successfully, so I'm considering them for future replacement (but that won't be for probably 3-4 years...not a dd.)
^^^X2, just stay with the 70R sidewall tire circumference, and you will be just fine. Some go to the 75R, and that changes everything!
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Old 03-05-2014, 02:57 PM   #28
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I recently went from the stock 225/75r16s to 285/75 BFG KM2's. Have a leveling kit but not installed yet. I have 3.21 gears and only noticed a difference in power in that starting out is smoother revving it about 100-200 RPMs higher. My MPG only took a hit of about 1, and really they handle a little bit better in my opinion. Road noise is of course noticeable but I have a soft top so there was noise anyway, not to mention a little MT buzz is like music to my ears.

I really can't see how much difference MTs will make of relatively same size except enhance looks & off-road performance.
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Old 03-05-2014, 06:04 PM   #29
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Here is a Great Graph I found that might help some of us out:

Gear Ratio and Tire Size Calculator - 4x4 and Jeep Ring & Pinion
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Old 03-05-2014, 09:02 PM   #30
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now how do I talk you into doing this for 18's???
Give a man a fish, you feed him for a day.
Teach a man to fish, and you feed him for life.

I hate metric sizes as they require so much calculating vs. imperial sizes that are straight forward. I suppose if you deal with metric a lot then they make sense. I for one, will never "get" metric without converting to imperial.

What the numbers mean, example: 235/55r16
235 is the width of the tire in mm. Multiply that number times .03937 to get inches.
55 is a percentage of the sidewall height to tire width. Multiple it times the width. (It's a percentage so put a decimal point in front of the number).
r16 is the rim diameter in inches.

Using the above tire size we can calculate the overall tire height.
235 x .03937 = 9.3" (this is the tire width).
Multiple percentage times width: 55 as a percentage = .55, so .55 x 9.3" = 5.115". (This is the sidewall height).
r16 is the rim diameter = 16".
So to get the tire height. Add 9.3" + 5.115" + 5.115" (there are two sidewall heights) + 16" = 26.23" in height.

A 235/55r17 is one inch taller than the 235/55r16 as both of the first numbers are the same. A 235/55r18 would be 2 inches taller than the 235/55r16.

Hope this wasn't too much math.

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