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Old 07-02-2013, 12:48 PM   #1
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Over thinking and I am going nuts..HELP!

I am going to start off by saying that if you read this entire novel of my scrambled thoughts, you are a saint! Just as the title states, I am driving myself crazy. I don't even want to think about how much time I have invested in researching what tires I should get. Let me give a little background information- I have a 2010 2 door automatic with the 3.8L minivan engine, 3.73 gears, and horribly worn Rubicon take offs. I am currently running the 2.5 inch Teraflex coil lift. I have a Superchips Flashpaq programmed on my Jeep. I am getting an average of 15.5mpg. Okay now here is where the madness begins..
I will be commuting to college for the next 5 years and it is a 50 mile round trip. I really REALLY want 35s, but regearing is not an option I can see in the foreseeable future. I would love to get 315/70r17 Duratracs as they are the lightest 35 out there, and still have an aggressive look for being an all-terrain tire. But I am pretty sure that weight does not play that huge of a role in the hit of performance and mpg I will take. It has to do more with the size of the tire itself, rotational mass or whatever (I think). I don't want to dread driving my Jeep every time I step into it. 33s sound logical to me, but I know they wont satisfy me as they are not much bigger than what I am currently running, and when I see a wrangler on 35s ill cringe.
I was thinking of shedding weight by getting 15inch wheels, but the largest Duratrac they sell with a 15inch wheel is the 33x12.5. Then I saw the 315/75r16, which I could also shed some weight there, however I don't want the rough ride that E load tires come with. Should I forget Duratracs and get something like a 285/75r17? Less width=less friction on the road?? Gahhhh I am seriously overthinking this. PLEASE. HELP. ME!!!!!!!!!!!!!!!

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Old 07-02-2013, 01:06 PM   #2
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so your content on getting 35's and mpg is your concern...its a tough call.
yes the duratracs are the lightest in that range however since you already have the stock rubi take offs, be advised that you WILL take a big hit on mpg when u upgrade.

theres a fine line w/ weight/mass making ur mpg goal. an additional 10lbs in weight equates to 100lbs of additional stress.

50 mile round trip on a daily basis? expect to spend more time at the pump.

i wanted 35's on my jeep but my last experience (1k on gas a month!) isn't that friendly on my wallet. lightweight 285/70/17's mated to lightweight wheels gives me 19-20mpg...thats the pentastar though.

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Old 07-02-2013, 01:21 PM   #3
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so your content on getting 35's and mpg is your concern...its a tough call.
yes the duratracs are the lightest in that range however since you already have the stock rubi take offs, be advised that you WILL take a big hit on mpg when u upgrade.

theres a fine line w/ weight/mass making ur mpg goal. an additional 10lbs in weight equates to 100lbs of additional stress.

50 mile round trip on a daily basis? expect to spend more time at the pump.

i wanted 35's on my jeep but my last experience (1k on gas a month!) isn't that friendly on my wallet. lightweight 285/70/17's mated to lightweight wheels gives me 19-20mpg...thats the pentastar though.
Its just so tough settling. Id be willing to sacrifice at most 3mpg, but obviously there is no telling how much id be losing. My commute is almost all highway so that makes it even worse. I think I'm in the early stages of developing a little man complex. I see a wrangler on 35s and I dont even wanna wave back haha.
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Old 07-02-2013, 01:35 PM   #4
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33's are more friendly. you don't have to consider getting a rear spare tire carrier, you don't have to consider regearing, you don't have to consider getting your axle c's gussetted, and best of all...mpg will take minimal hits.

Yes they look small when lifted, you may want to consider running 35's after running 33's (like me, but it ain't gonna happen/but i'm also known to be a procrastinator lol)

for you its a very tough call since you already have the stock rubi 32's. if you can take a 3 mpg hit, then 35's will make you happy. i don't know for certain how much of a hit you will take but 3 seems average for 35's.
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Old 07-02-2013, 01:49 PM   #5
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33's are more friendly. you don't have to consider getting a rear spare tire carrier, you don't have to consider regearing, you don't have to consider getting your axle c's gussetted, and best of all...mpg will take minimal hits.
I'm now looking into 285/75r17s. KM2s are the best looking and reliable I am finding. Is it safe to assume that since they are basically a 34'' and are less wide there would be a less of an impact on performance and MPG? However they are a mud terrain- which I know will yield worse performance on road than Duratracs all-terrain tread. They are also 62 lbs.

But now I see they are Load E tires. AHHHHHHH!!!!!
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Old 07-02-2013, 02:06 PM   #6
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for the 285/75/17 km2, size states 33.9. when mounted to ur jeep, measurements are probably gonna be closer to 33' than 34'. minimal power loss if you decide to go with those given by ur current setup.
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Old 07-02-2013, 02:09 PM   #7
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So what tires are P or LT versus an E?
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Old 07-02-2013, 02:10 PM   #8
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I commute to college 70 mile round trip in my 37s. For every semester I have been able to stack classes on the same day or take online classes and drive there once a week, twice a week at most.
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Old 07-02-2013, 02:13 PM   #9
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I have a 2013 JKUR and have averaged about 13.5 to 14.1. This was true when I had the stock 32" Rubi wheels and it's still true when I upgraded to 37s.

Yeah, it's a tough call, but it may not affect it all that much. I honestly can't speak for the older engine... If MPG is really a huge concern, you can always get a beater commuter car and save your Jeep for the weekends.
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Old 07-02-2013, 02:25 PM   #10
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I too wanted to go with 35" tires but this is my DD and I don't go off road much. I went with the 33x12.50x15 Duratrac's. The smaller rim makes the tire look bigger to me. I'm very happy with how they ride and by going down to a 15" rim and tire I saved some big bucks. My Jeep has a 2.5" lift and I don't think they look to small on it.
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Old 07-02-2013, 02:29 PM   #11
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If I go with 33s, I'll definitely regret it. If I go to 35s, ill probably regret it. Maybe I can get some gears for Christmas! I think I can deal with horrible performance for 5 months. I think I'm just gunna pull the trigger on the Duratracs and hope for the best! Hopefully the Superchips will help slightly, although I am not expecting miracles
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Old 07-03-2013, 02:14 AM   #12
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I now found the Goodyear MT/R with Kevlar in a 305/70r17..which is roughly a 33.5/34 inch tire. Am I kidding myself by thinking that the minimal difference in height and width between these and the 315/70r17 Duratracs will impact my performance and mileage less harshly? Or does switching from Duratrac with a less aggressive tread than the MT/Rs with an aggressive tread negate this possible savings in performance? I need help
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Old 07-03-2013, 03:15 AM   #13
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I just ordered a set of BFG A/T's 35x12.5x15 and level 8 trackers. With the amount of highway drving I do I know that the BFG's will last at least 50k mi. before I have to replace them. I also chose this combo for the weight, it's one of the lightest wheel/tire combo's in a 35" size. These tires measure 34.7" before being mounted, once you put them on the Jeep they will be a little less.

This is just what I did, do what you think is best.
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Old 07-03-2013, 03:52 AM   #14
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I now found the Goodyear MT/R with Kevlar in a 305/70r17..which is roughly a 33.5/34 inch tire. Am I kidding myself by thinking that the minimal difference in height and width between these and the 315/70r17 Duratracs will impact my performance and mileage less harshly? Or does switching from Duratrac with a less aggressive tread than the MT/Rs with an aggressive tread negate this possible savings in performance? I need help

Funny, it seems like you're having the same inner battle that I've been having between 33s and 35s and I finally settled on these "34s" as a compromise. I haven't done it yet, so I can't answer any questions about them, but on paper it looks good.

If you don't go with these though, it seems like you might have the answer already built into your post... The college commute is the issue making the mpg so important, but that has a definite end date of five years. Seems logical that you'll be replacing the tires again by the end of that five years anyway. Or somewhere close to that. So why not do the "smart" thing and settle on the 33s for now and use the money you hopefully save towards doing the 35s right (axle Cs, spare tire carrier, etc.) when you're done with college?
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Old 07-03-2013, 04:25 AM   #15
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I too wanted to go with 35" tires but this is my DD and I don't go off road much. I went with the 33x12.50x15 Duratrac's. The smaller rim makes the tire look bigger to me. I'm very happy with how they ride and by going down to a 15" rim and tire I saved some big bucks. My Jeep has a 2.5" lift and I don't think they look to small on it.
I agree. I think your rig looks perfect. I run 33's on a two inch lift.
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Old 07-03-2013, 06:42 AM   #16
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Originally Posted by bevensen View Post
I now found the Goodyear MT/R with Kevlar in a 305/70r17..which is roughly a 33.5/34 inch tire. Am I kidding myself by thinking that the minimal difference in height and width between these and the 315/70r17 Duratracs will impact my performance and mileage less harshly? Or does switching from Duratrac with a less aggressive tread than the MT/Rs with an aggressive tread negate this possible savings in performance? I need help
Duratrac's are better in the SNOW than the MTR's... and much quieter on the road too.
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Old 07-03-2013, 06:50 AM   #17
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Get the 35's

For gas mileage get a little commuter car for $3000. It will pay for itself in no time
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Old 07-11-2013, 11:55 AM   #18
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Hey everyone..quick update...
I did it! 315/70r17 Duratracs with my 3.73s and superchips. It honestly isnt as bad as I thought it would be. Thanks for all of your input! Click image for larger version

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Old 07-11-2013, 12:05 PM   #19
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