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Old 03-07-2013, 10:38 PM   #31
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Looks great: I have the same tire & wheel combo! (and a 2.5" TF coil lift)

I also went back & forth over 285s vs 315s, and am glad I went "big"! Since I was already running the stock Rubi 32"s, I figured the 285s just wouldn't make much of a difference, visually or otherwise.

The only drawbacks (besides dropping one or two mpg's in city traffic) is the added weight on the tailgate and additional stress on the front axle C's. My 315s fit just fine on the stock tire carrier, but to me it wasn't a long-term solution. I've since then added an aftermarket bumper w/tire carrier, and had to get the front bumper (with a winch) to match, of course. I've also added beefy C gussets, which is kind of a must with taller and heavier tires & wheels. This modding business is a slippery slope, as you can probably tell!

Good luck with your decision!
pretty much what I'm thinking. thinking all the minor things down the road that come with less than a inch of clearance. the 6-8 pounds per tire and the width of the tire. im on the stock sport tires so it is more of a difference than going from rubi tires to 285's. Also wondering about lose of power on and off the trail. just going back and forth like crazy

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Old 03-14-2013, 03:25 PM   #32
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Do the 285 70 17's fit on stockers based on back space without issues?

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Old 03-14-2013, 05:23 PM   #33
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I'd like to hear more from the 3.6L 6-speed guys with 3:73
Preferable 2 door.

What kind of mileage on the highway, and what's the RPM at 60 or 70?
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Old 03-24-2013, 02:30 PM   #34
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Went with the 315 75 17 GY Duratracs and Level 8 zx wheels. Will have those mounted Tuesday and the RK 2.5" base lift on by april 4. Can't wait to see how thing look but now still trying to figure out the winch and bumper set up. A friend of mine is running his 315 70 17 procomp spare on his 2008 stock tail gate carrier with no problem so far for those who were wondering
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Old 04-09-2013, 10:34 PM   #35
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Old 04-09-2013, 11:31 PM   #36
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I have been going back and forth on the same decision. I have a 2.5" lift and 285's now. Looks good, but 315's may look better? I'm also considering 33/12.5/17. Have you thought about that? Not much taller, but wider.

What to do, what to do...
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Old 04-10-2013, 10:57 AM   #37
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Here's my 2-door with 315/70/R17 Cooper AT3's
AEV 2.5" lift.
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Old 04-10-2013, 11:27 AM   #38
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I just put on a set of 315/70/17 duratracs. The tires are great, I just need to do a chalk test and figure out my correct psi. what are you guys running at?

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Old 04-10-2013, 11:39 AM   #39
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I'm running at 28 psi .....
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Old 04-10-2013, 11:59 AM   #40
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Get the 315's. You will never put them on and say, "dang it too big", but you might say, "dang it those look too small"!!

3.73's are fine and I run mine at 32psi. I think 28 or below is too squishy around the corners.
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Old 04-10-2013, 01:35 PM   #41
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I'd like to hear more from the 3.6L 6-speed guys with 3:73
Preferable 2 door.

What kind of mileage on the highway, and what's the RPM at 60 or 70?
I get 16.3 MPG 4 door on the interstate

70 MPH is 2050 RPM, if I keep it 65 or less I get 17+
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Old 04-10-2013, 02:04 PM   #42
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Go bigger, or you will regret it/spend more upgrading. Seriously, the 315 duratracs that I put on measured out to 33.5 inches on the jeep at proper inflation (head to measure for procal). I am already considering keeping those for winter only use and running something bigger and more aggressive for summer only. 2.5 Metalcloak lift. The 315s look good and are as small as I would go...
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Old 04-10-2013, 02:46 PM   #43
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You can get 285/70/17s in a P rated tire instead of LT, I am pretty sure there are only LT 315/70/17s. LT tires are made for 3/4 and 1 ton trucks and ride very stiff and weigh alot, not ideal on a light vehicle like a Jeep JK.
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Old 04-10-2013, 03:09 PM   #44
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I just installed 285/70/17's on my JK with stock suspension and I love the way they look. I'm sure i would love 315's too but for what I'm doing the 285s look cool and drive great...that is of course after i let half the air out of them from the way they came at 68.5!! Drove with them like that because i forgot to check and i thought i was going to fly out of the seat...aired them down and shes a dream....well a dream for being a Jeep!!!
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Old 04-10-2013, 03:16 PM   #45
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I went with the 2.5 Mopar lift and 315 Duratracs on my JKUS. I like it a lot, might even consider going bigger. I would recommend a sleeve and gusset kit if you're going to take it off road at all. A local shop did mine with the teraflex kit, parts and labor for under $700 and turned it in a day. I run 31 psi and get about 17mpg as a daily driver.
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Old 04-10-2013, 09:51 PM   #46
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I went with the 2.5 Mopar lift and 315 Duratracs on my JKUS. I like it a lot, might even consider going bigger. I would recommend a sleeve and gusset kit if you're going to take it off road at all. A local shop did mine with the teraflex kit, parts and labor for under $700 and turned it in a day. I run 31 psi and get about 17mpg as a daily driver.
Nice. Do you have a side pic of your Jeep? Looks sweet from the front.
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Old 04-11-2013, 08:46 AM   #47
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I have a 2 dr manual with 3.21. Im really wanting 315 but is this too much for the 3.21, is it bearable?
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Old 04-11-2013, 08:57 AM   #48
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Do the 285 70 17's fit on stockers based on back space without issues?
Probably not without some modifications from what I read.

Pronably trimming? I think the verdict is "YMMV" with the stock wheel backspace.
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Old 04-11-2013, 09:23 AM   #49
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Do the 285 70 17's fit on stockers based on back space without issues?
If you get wheel spacers that are 1.5" each side they will fit stock wheels with no trimming and no lift. You may get a slight amount of rub of you are fully flexed but everyday driving you will be fine.
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Old 04-11-2013, 11:05 AM   #50
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Here's my 2-door with 315/70/R17 Cooper AT3's
AEV 2.5" lift.
PERFECT!! Well Done
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Old 04-11-2013, 11:50 AM   #51
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Go 35" and while your wearing them out save the money up to do 37" and all the stuff that goes with them on your next rubber purchase.
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Old 04-11-2013, 01:34 PM   #52
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Nice. Do you have a side pic of your Jeep? Looks sweet from the front.

Thanks. Here's a crappy pic I took the other day with my phone, nothing better handy. I just added to PS Rocker knockers.
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Old 04-11-2013, 01:51 PM   #53
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Leveling kit (2" front, 1" rear) and 315's.

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Old 04-11-2013, 01:52 PM   #54
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Did the Mopar lift kit on mine, 2", and running 315's x70/17(Duratrac) used 1.5" wheel spacers to keep everything clean and clear...no problems at all
Nice! Looks like main street @ Lakewood Ranch??
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Old 04-11-2013, 02:36 PM   #55
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Are people using mostly LT or P tires? As a college student also, price differences matter, but would rather wait to get the right part than spend a little less and end up unhappy.
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Old 04-11-2013, 04:32 PM   #56
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Are people using mostly LT or P tires? As a college student also, price differences matter, but would rather wait to get the right part than spend a little less and end up unhappy.
Mostly LTs, very few P's available in 285/70/17s and none I believe in 315/70/17s.
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Old 04-11-2013, 04:43 PM   #57
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pretty much what I'm thinking. thinking all the minor things down the road that come with less than a inch of clearance. the 6-8 pounds per tire and the width of the tire. im on the stock sport tires so it is more of a difference than going from rubi tires to 285's. Also wondering about lose of power on and off the trail. just going back and forth like crazy
are your wheels 16" or 17"?
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Old 04-11-2013, 05:53 PM   #58
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Currently debating the same question on 285 vs. 315 (or 35x12.5's). I know the 315 will look better but it's basically a 35 (looking up 35x12.5 specs they usually say around 34.5" actual diameter) and everything I've read says you need to at least run gussets if not sleeves or a truss as well once you get to that size. That adds a lot more money to the upgrade of course, and I'm only off-road maybe once a month or so (so far at least, but only had the Jeep a year so who knows what this year will bring). So I've been thinking of 285's or 33x12.5's just for the better on road features.
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Old 04-11-2013, 06:14 PM   #59
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I have P285/70/17s on stock wheels, I like the look and the Jeep still handles great and has plenty of pep. I have a '12 auto with 3.73s.
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Old 04-13-2013, 06:13 PM   #60
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So I finally decided on my wheels. I put a deposit down and it's on hold for a week till I make up my mind. 315s or 285s. I have enough for the 35s and a leveling kit, or I could get 33s and wait a while to get the lift I want. Decisions decisions, but having 3.21 and a dd I'm gonna sure miss my 20-21mpg.

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