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Old 09-27-2015, 07:08 PM
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Biggest BFG KO2s on a 2016 Rubicon

Going to be getting after market rims (17x9) with 4.5 backspace. Trying to figure out the biggest size KO2s I can use without a lift and with no rubbing. 285? 305? Anyone have any ideas?

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Old 09-27-2015, 09:41 PM   #2
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i would sayt 285/70-17 but might rub off road with stock fenders. You should also look at the 34x10.5-17's. I have a set on stock rubi rims and use 1.5 spidertrax spacers with them. I run a lift and flat fenders so only going to use them for winter as I run 35's the rest of the time.

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Old 09-27-2015, 09:47 PM
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i would sayt 285/70-17 but might rub off road with stock fenders. You should also look at the 34x10.5-17's. I have a set on stock rubi rims and use 1.5 spidertrax spacers with them. I run a lift and flat fenders so only going to use them for winter as I run 35's the rest of the time.
I'm trying to keep everything (but the rims and tires) stock.
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Old 09-27-2015, 10:29 PM   #4
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I'm trying to keep everything (but the rims and tires) stock.
I think at the very least you will want to slap a leveling kit on. I like the 34's but running a 2.5" lift with flat fenders looks kind of goofy.
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Old 09-27-2015, 10:34 PM
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I think at the very least you will want to slap a leveling kit on. I like the 34's but running a 2.5" lift with flat fenders looks kind of goofy.
I want to keep everything stock. No kits, no lifts.
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Old 09-28-2015, 05:20 PM   #6
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I want to keep everything stock. No kits, no lifts.
Planned use? Street only? Some offroad?
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Old 09-28-2015, 06:06 PM   #7
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I have 285/75R16s KO2s on my Rubi and so far they only rub at full turn in reverse on the plastic air dam (so I really would not consider that rubbing).
You might be able to go a little larger, but if you go off road or disconnect, I think you will get some contact.

I looked at the 34x10.5 R17s as mentioned above, but they seem to measure a lot smaller than advertised. Most folks said they were actually around 32".

Here is my 285/75R16's (same overall size as a 285/70/17)




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Old 09-28-2015, 11:44 PM
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Planned use? Street only? Some offroad?
90% street. 10% off-road.
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Old 09-28-2015, 11:46 PM
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Thanks for the pics. That's one of the tough things I keep running into. When people say you "can't go above 33", does that mean tires labeled as 33 or tires that are actually 33 inches? Nothing is ever straight forward I guess.
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Old 09-29-2015, 06:21 AM   #10
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Originally Posted by Laguy25 View Post
Thanks for the pics. That's one of the tough things I keep running into. When people say you "can't go above 33", does that mean tires labeled as 33 or tires that are actually 33 inches? Nothing is ever straight forward I guess.
it means labled. actuall 33's are going to rub off road. I guess next question how much of that 10% offroad is going to be really offroad? If tough trails and not just forest service roads you are going to want bigger tires and bigger tires are going to rub. bfg 34x10.5's run an actual 32.25" and with no lift you will rub offroad if on tougher trails.
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Old 09-29-2015, 09:51 AM   #11
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90% street. 10% off-road.
You can always increase the bumpstop to limit the travel and keep the tire out of the fender. If only 10% offroad you probably wouldn't find that limiting.
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Old 09-29-2015, 11:41 AM
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You can always increase the bumpstop to limit the travel and keep the tire out of the fender. If only 10% offroad you probably wouldn't find that limiting.
ok so if I'm only doing 10% off road...and even that won't be heavy duty stuff, what is the largest labeled tire I can do on a 17x9 rim with 4.5 backs pacing where I won't have to worry about rubbing?
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Old 09-29-2015, 03:36 PM   #13
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We only wheel ours occasionally as well, but if moving out on a 4.5" backspace, even Honestly, stock might rub w/out doing something additional w/ that backspace. It's going to have to go up, flat fenders, or bump stops to limit travel because you're pushing the tire out under the fender lip.

I have 17x8.5s w/ a -4.5" bs sitting in the garage. Plans are for 305/65s w/ a Tera Level or 35s and a 2.5" bb. I could run either on the street (carefully w/ the 35s) but any wheeling and the lift is needed or a bump stop increase.

With the 9" rim the 285 will move the outer edge of the tire approx. 2.6" outboard from your stock setup.
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Old 10-01-2015, 02:58 PM   #14
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Everybody always talks about "Rubbing" in these discussions about how big of a tire someone can run. If all they are talking about is Fenders and Air Dams that's No Big Deal. Rubbing on Sway Bar Links, Body Mounts, etc.... is a problem. This thread has been pretty good but I wish people clarified what they mean by rubbing.

I'm looking at KM2's that actually measure 33.9 tall for my 15 Rubicon Unlimited with a Stubby Bumper and Flat Fenders and a 1" leveling spacer up front. Based on what I've ready I should be fine because of my Flat Fenders, No Air Dam and Stubby Bumper.
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Old 10-09-2015, 12:00 AM   #15
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Originally Posted by briand29 View Post
I have 285/75R16s KO2s on my Rubi and so far they only rub at full turn in reverse on the plastic air dam (so I really would not consider that rubbing).
You might be able to go a little larger, but if you go off road or disconnect, I think you will get some contact.

I looked at the 34x10.5 R17s as mentioned above, but they seem to measure a lot smaller than advertised. Most folks said they were actually around 32".

Here is my 285/75R16's (same overall size as a 285/70/17)




How's the ride with this setup? Those are the wheels I am settled on I just have to decide on a tire. I like the duratrac for the D load range but the KO2 is supposed to have better sidewalls. Just concerned about the E load rating as I also have a 2 door with less weight.
Also, what brand rock rails are those?
Looking good!
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Old 10-09-2015, 09:29 AM   #16
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How's the ride with this setup? Those are the wheels I am settled on I just have to decide on a tire. I like the duratrac for the D load range but the KO2 is supposed to have better sidewalls. Just concerned about the E load rating as I also have a 2 door with less weight.
Also, what brand rock rails are those?
Looking good!
Hi Sanddan,

I have posted this a couple times on the forum, but here is my 2-cents.

I think the E vs. D load rating is more of a keyboard mechanic issue than a real problem. First, I don't think 99% of people could tell the difference riding in a Jeep with E or D load rated tires with 35 PSI of air. Sure, if you run 70 or 80 PSI you are going to notice a difference, but not at 35 PSI.

Second, if you mention MPG you will get a 99 page thread where everyone says buy a prius, but then folks will get all bent out of shape about the ride quality of tires on a Jeep. We need a buy a Cadillac thread. hahaha

Seriously, don't let the E load rating give you any concern. I run 35 PSI in my BFGs and could not be happier.
I am running a 16in. wheel, so I am sure that helps, but I would not be worried with a 17in wheel either.

I am just happy to have the ATs. I really like the look of the MTs, but I am tired of the noise and road manners. I have the MTs on my truck and that's a good reminder of how glad I am to have the ATs.

Let me know if you have any other questions.
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Old 10-09-2015, 09:40 AM   #17
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I will second the D and E rating even vs a c rating. I run E and D back to back all the time (E toyo and D Ko2) and there is nada and I mean nada a difference in ride. If you did a blind test no way would you know which is which. Both ride better than stock km's. people need to learn that the max psi on the side is not the pressure they are meant to run at. That max psi is what they need to pumped to if they are on a truck loaded to the max gvwr ie a 1 ton hauling a 40' 5th wheel.
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Old 10-09-2015, 10:27 AM   #18
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Also, what brand rock rails are those?
Looking good!
I missed this part earlier.

The rock rails are Shrockworks with some grip tape. I bought them originally for my 2011 Rubicon, ran them for a couple years, stored them for a few years and reinstalled them on my 2016. Excellent quality product if you don't mind the long delivery time.
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Old 10-09-2015, 10:54 AM   #19
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I missed this part earlier.

The rock rails are Shrockworks with some grip tape. I bought them originally for my 2011 Rubicon, ran them for a couple years, stored them for a few years and reinstalled them on my 2016. Excellent quality product if you don't mind the long delivery time.
I think Shrockworks has sped up a bit on delivery. I got my rear bumper in less than a month and they I think they said 3 weeks on sliders they were accurate about telling me when it would be done. I agree shrockworks is very nice quality.
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Old 10-09-2015, 12:43 PM   #20
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I think Shrockworks has sped up a bit on delivery. I got my rear bumper in less than a month and they I think they said 3 weeks on sliders they were accurate about telling me when it would be done. I agree shrockworks is very nice quality.
It is good to hear they are delivering products faster. Mark is great and he builds terrific products, but waiting 3-4 months is a deal killer for most folks.
I would like to get a set of bumpers but I have put it off because of the wait. Maybe I will have to reconsider.
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Old 10-09-2015, 03:13 PM   #21
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I would stay away from E rated tire IMO. I know its not a Jeep but I had a 2013 Suburban that was leveled in front and had 285/60/20 E rated 10ply tires with Fuel wheels and it rode like CRAP. hated it, after about 1500 miles switched back to a LT 275/60/20 and drove like stock again. My passengers could tell difference as well. 10ply tires are HEAVY unsprung weight even for a heavy truck like a Suburban cant imagine I could not tell on a light Jeep. JMO
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Old 10-09-2015, 03:34 PM   #22
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a 60 series 20" I wonder why lol.

Not even in the same realm as a 70 or 75 series 16 or 17" tire.

I have run P's, C, D and E and with proper psi on 16 or 17" rims not going to be a problem.
Haha - You beat me to it.

People run car tires all the time with a 1-inch sidewall and never really complain about the rough ride, but get all upset about E Load Range tires with a 6 inch sidewall.

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