BFG K02 285/70/17 vs 315/70/17 - Jeep Wrangler Forum
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Old 02-21-2016, 01:55 PM
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BFG K02 285/70/17 vs 315/70/17

Upgraded the tires yesterday, and wanted to show before and after, I didn't take pics side by side unmounted, but I have a picture I took some weeks ago with the 33's, and then one from yesterday, with the 35's, same wheels, more or less at the same camera angle, and also a comparison of both tire side to side, mounted in my vehicles, though the 33's are mounted in my Silverado now, but the size is still the same, 32 1/8" mounted on the 285/70/19 on a 17x9 wheel, vs 33.5" on the 315/70/17 on a 17x9 wheel.

285/70/17 BFG KO2
20151025_180120 by SilverFJ RSM, on Flickr

315/70/17 BFG KO2
20160221_104307 by SilverFJ RSM, on Flickr

Side to side
20160221_103708_HDR by SilverFJ RSM, on Flickr

20160221_103934 by SilverFJ RSM, on Flickr

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Old 02-21-2016, 02:07 PM
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Also to note, absolutely zero difference between the way the 3.6L power up the Jeep with 315's, compared to the way it did the 285's. zero, I could have started up with this size back in July 2015 when I decided to go with 33's, based on some people comments that 3.21's would be a horrible gear for 35's. Don't get me wrong, I'll be regearing anyways in a couple of months, but i wouldn't have any problems keeping up the 3.21's with this tires.

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Old 02-21-2016, 02:15 PM   #3
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Originally Posted by rsmwrangler View Post
Also to note, absolutely zero difference between the way the 3.6L power up the Jeep with 315's, compared to the way it did the 285's. zero, I could have started up with this size back in July 2015 when I decided to go with 33's, based on some people comments that 3.21's would be a horrible gear for 35's. Don't get me wrong, I'll be regearing anyways in a couple of months, but i wouldn't have any problems keeping up the 3.21's with this tires.
Thanks for sharing the great pics and size comparisons. I'm planning on regearing my stock 3.73 to 4.10 as budget permits for our Hard Rock Rubicon Unlimited. Do you plan on using Mopar based gearing upgrades and going through the dealer for factory warranty support or are you going a different route?
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Old 02-21-2016, 05:00 PM
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Originally Posted by jlaskin View Post

Thanks for sharing the great pics and size comparisons. I'm planning on regearing my stock 3.73 to 4.10 as budget permits for our Hard Rock Rubicon Unlimited. Do you plan on using Mopar based gearing upgrades and going through the dealer for factory warranty support or are you going a different route?
Np.
I'm planning to let my local offroad shop (Rebel Offroad) do the job, and I'll go with whatever manufacturer they use. I have 60k miles already, si not a lot of warranty left.
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Old 02-21-2016, 05:10 PM   #5
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Np. I'm planning to let my local offroad shop (Rebel Offroad) do the job, and I'll go with whatever manufacturer they use. I have 60k miles already, si not a lot of warranty left.
That makes sense good luck with the upgrades! Wish I had a local off-road shop to trust here as well in the Long Island/NYC area. Those KO2s look amazing! How's clearance with the 315's both off and on pavement? Which size and brand lift did you go with? What was the reason for opting on the 315 vs. 35/12.5's?
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Old 02-21-2016, 08:53 PM
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Haven't tried them offroad just yet as I got them installed yesterday. no issues on-road, i'm not expecting any clearance issues offroading except perhaps for some fender rubbing, if I get fender rubbing, i'll either trim the fenders or look into other fender options. I'm running what is considered a 2" OME lift, at least the springs are OME, see my build page in my sig , i'm just waiting to receive new 2619 OME springs to replace the 2616's I have, as i'm running too much weight in the front, and I need to recup at least 1" to make the ride level. Once I get the coil springs installed, i'll start testing for offroad clearance and adjust the fenders as needed.

The reason I went with 315/70 instead of 35x12.5 is explained below, basically the 315's were 20$ cheaper, and 4lbs lighter, my local DT store had both sizes available, but after having them side by side, it was easier for me to chose the metric size
https://www.wranglerforum.com/f27/315...2-1616601.html
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Old 02-22-2016, 09:05 AM   #7
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Originally Posted by jlaskin View Post
Thanks for sharing the great pics and size comparisons. I'm planning on regearing my stock 3.73 to 4.10 as budget permits for our Hard Rock Rubicon Unlimited. Do you plan on using Mopar based gearing upgrades and going through the dealer for factory warranty support or are you going a different route?
For the cost and work involved, seriously consider a larger jump than just to 4.10s. Your perceived gains will be minimal. 4.56 or 4.88 would be a better choice IMO.
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Old 04-24-2016, 11:18 AM   #8
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Hey RSMWrangler

Do you have a side view picture of your Jeep with the 315s on?

Any more impressions of these tires? I am getting them pretty soon.
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Old 05-05-2016, 11:14 AM
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Hey RSMWrangler Do you have a side view picture of your Jeep with the 315s on? Any more impressions of these tires? I am getting them pretty soon.
I have a bunch of pics in my built page, hopefully you'll find one in there that would give you the perspective you're looking for, I'm not close to a computer right now, otherwise I'll post something for you.

The tires are just simple fantastic, quiet in the fwy, and I mean zero noise, terrific tires in snow and slush, great sidewall, even wear, I run the
size at 32 psi, nice and smooth ride even though they're E rated, no issues with them in the rocks, so far offroad traction have been incredible in everything I have put them through at 14-15psi, no mud tests though, as I tend to stay as far away as I can from that crap.
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Old 05-06-2016, 12:32 AM   #10
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I have a bunch of pics in my built page, hopefully you'll find one in there that would give you the perspective you're looking for, I'm not close to a computer right now, otherwise I'll post something for you.

The tires are just simple fantastic, quiet in the fwy, and I mean zero noise, terrific tires in snow and slush, great sidewall, even wear, I run the
size at 32 psi, nice and smooth ride even though they're E rated, no issues with them in the rocks, so far offroad traction have been incredible in everything I have put them through at 14-15psi, no mud tests though, as I tend to stay as far away as I can from that crap.
Thanks a lot!

Yes I did see your build thread before. I'm glad to hear they are such good tires... Mine should go on tomorrow, pretty excited.
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Old 05-06-2016, 02:56 PM   #11
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I have been looking at new tires to put on a recently procured set of Fuel rims and was going back and forth between the KO2 285x70x17 and the 34x10.5x17 and after checking out your build thread and some other advice on other threads I've put the call in for a set of 285x70x17s that will be going on on Monday.
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Old 05-13-2016, 09:37 AM   #12
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Do you have a measurements for how tall the 315 and 285's are mounted on the jeep
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Old 05-13-2016, 11:45 AM   #13
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Do you have a measurements for how tall the 315 and 285's are mounted on the jeep
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..... the size is still the same, 32 1/8" mounted on the 285/70/17 on a 17x9 wheel, vs 33.5" on the 315/70/17 on a 17x9 wheel.
33.5" seems to be the norm for a 315 on a 17x9. Probably net at least a half inch more if on a 17x8
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Old 04-18-2019, 11:22 AM   #14
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Also to note, absolutely zero difference between the way the 3.6L power up the Jeep with 315's, compared to the way it did the 285's. zero, I could have started up with this size back in July 2015 when I decided to go with 33's, based on some people comments that 3.21's would be a horrible gear for 35's. Don't get me wrong, I'll be regearing anyways in a couple of months, but i wouldn't have any problems keeping up the 3.21's with this tires.
Would the 3.21 gears perform on easy trails with 315/70's, or maybe hills like driving through Colorado? Currently debating on keeping my 285's or upgrading to 315's. I don't have intentions to regear for another few years.

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