Experience with 39” BFGoodrich KM3’s Mud Terrain Tires

Deezus

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How cool is that to win a set of awesome BFG T/A KM3 tires. Thank you for posting up your initial thoughts along with some amazing photos. The front end photo of your Jeep makes it look like a beast.

Congratulations on willing a set of tires from your local Discount Tire. Please share you thoughts when you get them off-road.
Can you tell us how much the 39s weigh, tires only?
Thanks
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Discount Tire

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Can you tell us how much the 39s weigh, tires only?
Thanks
Hi, Deezus!

According to the weight specs we've been provided, the weight of the 39x13.50R-17 KM3 is 87 lbs. (86.95 lbs to be exact).
 

Deezus

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Hi, Deezus!

According to the weight specs we've been provided, the weight of the 39x13.50R-17 KM3 is 87 lbs. (86.95 lbs to be exact).
What is the weight of the 38 Patagonia?
Thanks
I ask because on Americas tire it says it's lighter. It also says that the tire I'm currently running, Cooper sst pro, 37/12.50/17, is 70lbs.
Very confusing.
 

Carlton

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What is the weight of the 38 Patagonia?
Thanks
I ask because on Americas tire it says it's lighter. It also says that the tire I'm currently running, Cooper sst pro, 37/12.50/17, is 70lbs.
Very confusing.
Patagonia stated weight on their website is 82 pounds. I have weighed 5-6 of them on a scale and all came in between 78-79 pounds.
 

Discount Tire

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What is the weight of the 38 Patagonia?
Thanks
I ask because on Americas tire it says it's lighter. It also says that the tire I'm currently running, Cooper sst pro, 37/12.50/17, is 70lbs.
Very confusing.
We apologize for the confusion with the weights, Deezus! Here's what we show:

38x13.50R-17 Patagonia M/T - 82.4 lbs.
37x12.50R-17 STT Pro - 82.83 lbs.

For reference, tire weights and other specs are provided to us by the manufacturers.
 
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KeepinItSimple

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Hi all,

There’s bound to be a hungry market for these new rubber juggernauts, so I figured I would share my experiences thus far to better prepare those looking to make the upgrade.

I was fortunate enough to have won a set of 4 KM3s courtesy of Discount Tire in Decatur, Texas last July. Yes, last July. I opted for the 39” tires because duh. The tires have been on order for so long because they took a while to release them. They’re also on backorder our the ass, so you’ll have to wait a while to get them. I was told that I’m one of the lucky few to be running around with these installed right now.

If you head out to Discount Tire in Decatur, talk to Chris Olson our there if you want to be treated well. He was working with me via Facebook Messenger keeping me updated the entire time. Also ask him if he has any specials on wheels, because he may have some sitting in the back. I was able to snag 5 17x9 Rotiform SIX’s for a ridiculously good deal, less than half what the going rate is online.

Anyway, I had Chris and his team install the tires this past Saturday.

Results:

- Ride is much smoother, believe it or not. I switched from 5 37” BFGoodrich KO2’s, which were great. However, I’ve always heard that the JL is truly optimal with 38” tires. After my experiences, I believe it’s true. The KM3’s true diameter is 38.5”

- With a Rock Krawler 3.5” lift installed, I have 12” of ground space from the bottom of the pumpkins on both axles.

- I have LoD Destroyer rock rails installed, and it’s literally 24” from ground to the foot step. I feel like a badass climbing in and out of my Jeep, as per usual. I had to bring a step stool to my dinner at Bob’s Steakhouse so my tiny little Asian mother could climb in and out of my ride.

- THERE IS SOME RUBBING on the lower control arms AND the rear inner fenders. I had to uninstall the rear liners so that it was no longer an issue in the rear. I also installed some 1.75” Spidertrax wheel spacers on all four wheels, which took about two hours, in order to FIX the rubbing on the lower control arms. I’m happy to report that the rubbing is gone.

- RIDE QUALITY is much better after having installed the spacers. Hell, it was great without the spacers, but the turning radius was absolute shit. The rubbing was also unsettling as well. With the spacers installed, it’s smooth as silk. I’m quite impressed that things got better even after switching to bigger tires.

- ROAD NOISE is admittedly higher, but my Jeep’s entire inner frame is coated in Dynamat, so that helps. The noise isn’t unbearable. You’ll just notice it initially and then you get used to it. I have a Borla Offroad exhaust that runs loud, so I’m used to road noise. If road noise is a concern, this is a Jeep, so stop being a bitch about it.

- OFFROAD - Nothing to report. Yet. I’ll take it wheeling soon and let you know, but I have a feeling I’m going to be pleased with the results.

Anyway, figured I’d share to help you out. I’d you’re on the fence, do it. But you’ll have to get in line.

I’m sure you’ll have questions, let me know below.

PICS (my build log is available HERE: https://www.jlwranglerforums.com/fo...x9-rk-x-factor-3-5”-w-king-shocks.3054/page-7)

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Jeep looks amazing man!! I’m actually doing practically the same build and had a quick question.. do you happen to know what how y’all the tallest point on your Jeep is now? Like what’s the minimum clearance for a garage door that you fit in?? Asking because I wanna make sure I’m still gonna fit in mine lol
 

No IFS

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39” BFG’s are my next tire
 

4xnaz

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Also went the 39" BFG KM3 route. I upsized from 38" Patagonia's. I don't know if its just a placebo effect or the real deal, but the BFGs actually feel more "comfortable". Granted they have a full tread depth and the Milestars had 25000 miles on them when I changed but I'm loving everything these BFGs are giving me so far.

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Jeepney209

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Are you running on stock axles? I’ve been thinking about switching from Patagonia’s 38s to KM3 39s. I’m just a little worried about cutting/chopping to avoid rubbage issues.
Also went the 39" BFG KM3 route. I upsized from 38" Patagonia's. I don't know if its just a placebo effect or the real deal, but the BFGs actually feel more "comfortable". Granted they have a full tread depth and the Milestars had 25000 miles on them when I changed but I'm loving everything these BFGs are giving me so far.

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4xnaz

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Are you running on stock axles? I’ve been thinking about switching from Patagonia’s 38s to KM3 39s. I’m just a little worried about cutting/chopping to avoid rubbage issues.
I am still using the OEM D44 axle housings. However I replaced the rear shafts with Yukon chromoly shafts and changed the front to RCV shafts. I added a truss kit and C gussets to the front housing as well as changing the gear ratio to 5:13.
 

Martindfletcher

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I am still using the OEM D44 axle housings. However I replaced the rear shafts with Yukon chromoly shafts and changed the front to RCV shafts. I added a truss kit and C gussets to the front housing as well as changing the gear ratio to 5:13.
this is my plan as well. I have the front rcv’s installed. I bought the gears, rear Yukons and trusses. I think I’m going to take the axles out to do this as I don’t have a lift. I will keep my sst pros for another year I think. I just got the parts now due to covid snd more time than usual.
 

Xtremetj

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I just upgraded to these tires too. I haven’t had a chance to use them on a trail yet but I love the way they ride. They do measure small but everyone knows that. I have split the front fenders with the AAL kit and have their rear liners on order.
We are hard in to the bumps in the pics with not rubbing up front. I do have some room to go so we’ll se what the real world flexing shows.

I was going to regear/truss/c-gusset and add chromoly shafts to these axles but chose not to put money in to the stock axles. I ordered the Ultimate D60’s. They’ll be here the 21st. I can not wait until they’re installed.

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Martindfletcher

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I just upgraded to these tires too. I haven’t had a chance to use them on a trail yet but I love the way they ride. They do measure small but everyone knows that. I have split the front fenders with the AAL kit and have their rear liners on order.
We are hard in to the bumps in the pics with not rubbing up front. I do have some room to go so we’ll se what the real world flexing shows.

I was going to regear/truss/c-gusset and add chromoly shafts to these axles but chose not to put money in to the stock axles. I ordered the Ultimate D60’s. They’ll be here the 21st. I can not wait until they’re installed.

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That looks awesome.. who’s lift?
 

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I just upgraded to these tires too. I haven’t had a chance to use them on a trail yet but I love the way they ride. They do measure small but everyone knows that. I have split the front fenders with the AAL kit and have their rear liners on order.
We are hard in to the bumps in the pics with not rubbing up front. I do have some room to go so we’ll se what the real world flexing shows.

I was going to regear/truss/c-gusset and add chromoly shafts to these axles but chose not to put money in to the stock axles. I ordered the Ultimate D60’s. They’ll be here the 21st. I can not wait until they’re installed.

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I have those tires and wheels on my 2 dr JK. Been thinking of putting them on the JL too.
 
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