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Old 03-06-2013, 06:22 PM   #1
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285/70R17 vs 315/70R17

Hey guys looking at putting a Teraflex 2.5 inch coil lift on later this summer and looking at tires. Pretty much narrowed down to goodyear duratracs or kelly safari tsr's just don't know what size to go with. Goign on a JKU and is a DD. will the 285's look too small? also I'm a college student so that goes into the decision as well. Head says to go with the "33's" but love the look of the 315's. Any input would be nice. Thanks

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Old 03-06-2013, 06:42 PM   #2
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Go with the 315s. They are a little smaller than a true 35 and they look awesome.

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Old 03-06-2013, 06:45 PM   #3
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For the very small price diffrence go with the 315's. You will regret it otherwise unless you have 3.21 gearing.
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Old 03-06-2013, 07:11 PM   #4
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it's an auto so I have 3.73 gearing. The two thing im wondering how much will that little more than an inch of the 315 (12.7 vs 11.5 width) hurt mpg around town? and would a 33 look too small with a 2.5 inch lift? it's only 1.4 inches taller and weight is 6-8 lbs heavier as well
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Old 03-06-2013, 08:52 PM   #5
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I lost maybe 1 mpg switching from 285/70/17 Duratracs to the same in the 315 size. On paper it doesn't seem like much of a diffrence between the sizes but in reality there is a pretty big diffrence.

I think 33's look good with some 2.5 lifts but mine with the Rock Krawler Max Travel looked out of place but luckily I already had my 315's ordered so I only drove around that way a few days.
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Old 03-06-2013, 08:57 PM   #6
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What makes you think you have 3:73's just because you have an auto?
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Old 03-06-2013, 09:10 PM   #7
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315's all day long. Ordered the 285's from Tire Rack then couldn't sleep over my decision. Called them first thing in the morning an switched to 315's. Never looked back!
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Old 03-06-2013, 11:55 PM   #8
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i just looked it up its 3.73 i was confused looking at something. -_- But making want to go right with the 315's. anyone else's two cent's for pro's or con's?
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Old 03-07-2013, 05:05 AM   #9
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Skip the 2.5" lift & 315s and go straight to 3.5" & 37s!
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Old 03-07-2013, 05:35 AM   #10
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Quote:
Originally Posted by jeepkid93 View Post
Hey guys looking at putting a Teraflex 2.5 inch coil lift on later this summer and looking at tires. Pretty much narrowed down to goodyear duratracs or kelly safari tsr's just don't know what size to go with. Goign on a JKU and is a DD. will the 285's look too small? also I'm a college student so that goes into the decision as well. Head says to go with the "33's" but love the look of the 315's. Any input would be nice. Thanks
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
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Old 03-07-2013, 07:19 AM   #11
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Originally Posted by Amwajtommy View Post

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
Do you like your mopar lift? I've been pointed towards a 2.5" lift and 35" tires? No definite plans yet, just looking around seeing what would work for me.
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Old 03-07-2013, 08:22 AM   #12
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Seems to be ok, mind you I dont do any radical off-roading (articulating), so there might be issues...let the more experienced guys comment...
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Old 03-07-2013, 08:28 AM   #13
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I'm in the same boat, trying to decide between the 285s and 315s, but does anyone have any comment on whether either of those will fit the stock spare carrier, or will they both require a modification for that? That might affect the OP's choice since cost seems to be a factor.
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Old 03-07-2013, 08:31 AM   #14
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I'm in the same boat, trying to decide between the 285s and 315s, but does anyone have any comment on whether either of those will fit the stock spare carrier, or will they both require a modification for that? That might affect the OP's choice since cost seems to be a factor.
There are kits available for the larger tires, but there is also the issue of additional weight imposed on the tailgate skin (02-thin)
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Old 03-07-2013, 08:34 AM   #15
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Originally Posted by AgBullet
I'm in the same boat, trying to decide between the 285s and 315s, but does anyone have any comment on whether either of those will fit the stock spare carrier, or will they both require a modification for that? That might affect the OP's choice since cost seems to be a factor.
The 285's will fit the spare tire carrier. The 315's will not fit without extending it.. I recently had to add an extender to the carrier to fit my 35's on the carrier. The extender for the carrier runs around $40
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Old 03-07-2013, 08:55 AM   #16
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The 285's will fit the spare tire carrier. The 315's will not fit without extending it.. I recently had to add an extender to the carrier to fit my 35's on the carrier. The extender for the carrier runs around $40
Do you know how bad the weight concern is? With 35's how much more is the weight difference and how much can I get away with
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Old 03-07-2013, 09:01 AM   #17
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The 285's will fit the spare tire carrier. The 315's will not fit without extending it.. I recently had to add an extender to the carrier to fit my 35's on the carrier. The extender for the carrier runs around $40

My 315's fit on my stock carrier just fine.....
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Old 03-07-2013, 09:10 AM   #18
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I ordered the 35MTR's w/Kevlar for my 3.25 lift, i wanted to have some room without ripping off my fenders. I seen folks run 35's with no lift at all but I wouldn't do such if I was actually going balls out.
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Old 03-07-2013, 10:13 AM   #19
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I went with 315/70/R17's, because I got more than 2.5" of lift on my 2-door.
I ended up with 3 inches of actual lift (measured with the stock tires) from the AEV 2.5" lift. My tires are being mounted/balanced today. I installed the lift first, before I made a final decision on tires.
Plus, I wanted to drive it first with the stock tires to see how much the lift actually improved my ride/handling. I'm going to install my new wheels/tires this weekend and see how they look/feel.
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Old 03-07-2013, 12:58 PM   #20
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With daily life weighed in, the 285's will weigh less and affect mpg less. I'm very happy with the price/weight/mpg considerations of my 285/70/17 tires and if I lift the jeep i will still continue to get this size.
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Old 03-07-2013, 03:02 PM   #21
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Originally Posted by alabamajeep

My 315's fit on my stock carrier just fine.....
I should have mentioned I have an aftermarket bumper. My bad. Sorry
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Old 03-07-2013, 03:04 PM   #22
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Quote:
Originally Posted by Shute47

Do you know how bad the weight concern is? With 35's how much more is the weight difference and how much can I get away with
I forgot to mention I have an aftermarket bumper. So the 35's hit it. I don't know about the factory bumper. Sorry
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Old 03-07-2013, 03:06 PM   #23
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With daily life weighed in, the 285's will weigh less and affect mpg less. I'm very happy with the price/weight/mpg considerations of my 285/70/17 tires and if I lift the jeep i will still continue to get this size.
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Old 03-07-2013, 03:43 PM   #24
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I have a teraflex leveling kit and the 19/58 springs and am running 285/70/17. I debated going to 34's or even trying to stuff 35's on there and am glad I didn't. I imagine the 35's will look better with the 2.5" lift. I can't comment on drivability for you though since your engine is newer and you have an auto...

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Old 03-07-2013, 04:08 PM   #25
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I have a teraflex leveling kit and the 19/58 springs and am running 285/70/17. I debated going to 34's or even trying to stuff 35's on there and am glad I didn't. I imagine the 35's will look better with the 2.5" lift. I can't comment on drivability for you though since your engine is newer and you have an auto...

driveabliltiy is wht i'm mostly worried about since I live out in Idaho for 9 months a year and driving in the hills and mountains don't want to be working too hard all the time. btw did u plasti dip your rims?
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Old 03-07-2013, 04:37 PM   #26
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It's rustoleum hammered black, the finish looks a lot like plastidip, kind of a barely glossy matte, easy to touch up since it's textured.
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Old 03-07-2013, 05:27 PM   #27
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I just installed a 2.5" lift and 315/70/17 duratracs this week on my 2012. The tires measure out to about 33.75" when on the Jeep and mounted on a 9" wide rim. Im real happy with the look and am glad I went with the 315. This jeep is my daily driver as well, has the 3.73 gears and seems to have no problems moving them.

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Old 03-07-2013, 05:48 PM   #28
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I just installed a 2.5" lift and 315/70/17 duratracs this week on my 2012. The tires measure out to about 33.75" when on the Jeep and mounted on a 9" wide rim. Im real happy with the look and am glad I went with the 315. This jeep is my daily driver as well, has the 3.73 gears and seems to have no problems moving them.

have a mpg with the lift and tires yet? Im getting around 16/17 ish since most of my is city driving in Boise.
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Old 03-07-2013, 06:30 PM   #29
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Nothing yet for mpg. I've only put about 60 miles on the tires so far. I usually get about 16 to 17 mpg for my city drive commute so I'm guessing it will be like 15 now.
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Old 03-07-2013, 10:02 PM   #30
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I just installed a 2.5" lift and 315/70/17 duratracs this week on my 2012. The tires measure out to about 33.75" when on the Jeep and mounted on a 9" wide rim. Im real happy with the look and am glad I went with the 315. This jeep is my daily driver as well, has the 3.73 gears and seems to have no problems moving them.

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!

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