Largest Functional Tire Without Mods

[MTNDOG]

It’s not so much the width and height of the tire, if it forced me to get a lift that wouldn’t be the end of the world, but it might be the end of me parking in my 7 foot gara

I know, but my wife would love it if it didn’t fit. Then she’d get to park in the garage.

With a KO twos 285/70 R 17s, what pressure are you guys running? I was up in the mountains on the highway going to high 80s miles per hour and I got an over pressure warning at 47 pounds. I think it’s just the way the TPS is set. also, what temperature are you guys seeing on your tires? Mine were between 100° and one of them the rear driver was 115. I don’t think that’s overall too hot but considering it was 55° out but I was interesting. Thought that the difference across them was interesting. E Rated tires.

Ouch, that's cold..oh wait my Ineos and daughters Mini countryman in the garage...wife's Subaru sits out in the driveway. 2 strikes against me...1)making her drive a Subaru 2) having her car sit outside all winter.

 

[Texas Grenadier]

It’s not so much the width and height of the tire, if it forced me to get a lift that wouldn’t be the end of the world, but it might be the end of me parking in my 7 foot garage.

So a buddy of mine brought his grenadier to my office and house today. Both 7’.

If you have a 2.5 lift/ 35’s on 17” wheels you will fit by the hair of you chinny chin chin.

Office garage that say 7’ had plenty of room with rack!!!!

 

[ADVAW8S]

So a buddy of mine brought his grenadier to my office and house today. Both 7’.

If you have a 2.5 lift/ 35’s on 17” wheels you will fit by the hair of you chinny chin chin.

Office garage that say 7’ had plenty of room with rack!!!!

Fits like a glove.

 

[MileHigh]

285/70r17 E rated KO3 stock stellies

 

[Oz4WDriva]

Hello ladies,

Anyone know what the largest tire size is that can be used without rubbing, binding, and without cutting the vehicle to make it fit?

I'm also wondering if there are any options out there for upper control arm replacement to properly lift the truck say... 4 inches, while retaining correct angles.

Lastly... I see that spare tire upgrade size will likely be limited by the left rear access door needing room to open before the right side... looks like about 2 inches further would be the max...?

Hello Lovely
I recently fitted a set of BFG 285/70R17 Mud Terrain KM3 on factory aluminium wheels. The 285’s are the suggested largest upsize for KM3’s without replacing the rims. Results include: Overall diameter increase, 30 mm bigger than 265/70R17 muddies resulting in greater ground clearance of around 20 mm (3/4 inch) over the A/Ts. Speedo is now more accurate moving from 5% under to 1.5% under. They feel so much better, more positive feel and greater directional control on all road surfaces. Mmmm! Muddies!!! Cheers Pete

 

[MileHigh]

Factory, aluminum 17? In the US we only get 18 inch aluminum rims…

 

[anand]

Factory, aluminum 17? In the US we only get 18 inch aluminum rims…

There's also the above shown 17" aluminum wheel as an option on all Trialmasters and Base SW's here in the US

 

[Qwatch]

So far so good. No louder than the stock ko2's and seems to handle a bit better on road.

I ran these in a different size on my previous vehicle and was very happy with their offroad performance and wet tarmac was light years ahead of the ko2's on the Grenadier

Still happy?
How abt the noise on the road?
Gas ️ drinking difference?
Thank you!
If you have pics to share

 

[NoAge Hunter]

I just put Yokohama X-AT's on in 285/75/R17 on the stock steelies and still clear the rear door by a few mm.

Yes- with Yokohama G003 in 285/75 17 there is exactly 1mm of space …..

 

[ECrider]

Yes- with Yokohama G003 in 285/75 17 there is exactly 1mm of space …..
View attachment 7891805

mighty fine clearance

 

[Brad@SuperiorCO]

4 weeks into the MT 255/85/17's and very happy. I am running them at 36/38 psi around town, and air down to 20-ish psi off road if needed.

I had this conversation with the MT engineer this week about tire pressure.

"Thanks for reaching out and for sharing your observations. You're spot on about the increase in tire pressure you're seeing on long drives, from 36-38 psi cold to 43-46 psi hot, is a completely normal result of the tire heating up from friction and flexing during driving. This 6-10 psi increase is expected, especially over a 6-hour trip and in warmer conditions, and the observed temperatures align with this. Also, since you've changed to a non-stock tire size, the original door placard pressure may not be applicable for optimal inflation with the new Baja Boss tires. To help you determine the proper cold inflation pressure for your setup and ensure optimal performance and tire life, could you please send us a picture of your vehicle's door tag? This will show us the stock tire size and original equipment inflation pressure, which we can use as a baseline to calculate the appropriate pressure for your new 255/85R17 Baja Boss tires.

To answer your question about bleeding air off and refilling them, that would be a big no-no. All tire pressures are determined with the tires cold to accommodate for thermal expansion due to increased pressure, even the max inflation pressure on the sidewall. If you lowered the pressure when they were hot, they would more than likely be overloaded, or you could develop wear issues or worse. They may also be much lower than they should be (if you are still running them at the door tag pressure) which further increases friction (the tire has more sheer force to overcome) which generates more heat, further exacerbating the pressure.

Happy to help! After reviewing your door tag information, the 43 and 49 psi numbers do carry over to this size as well, so everything looks great there. That said, the PSI increase is within range considering the temperatures you shared, so if you keep the tires at the door tag pressure (cold inflation pressure) there should be no cause for concern. Also, ensuring everything is in alignment and performing rotations at every 3,000-5,000 miles will help keep the wear even across all four tires."

I will still run them in the 36/38 psi range, but I will no longer worry when they get to the mid 40's on the highway. The tires are rated to 80 psi.

 

[Zimm]

Yea. I’ve been high 40’s for 5000 Miles’s the high 30’s is “old wives tale” advise.

 

[MileHigh]

4 weeks into the MT 255/85/17's and very happy. I am running them at 36/38 psi around town, and air down to 20-ish psi off road if needed….
… I will still run them in the 36/38 psi range, but I will no longer worry when they get to the mid 40's on the highway. The tires are rated to 80 psi.

Wow. That is really impressive that you got that kind of feedback. In this day and age, it’s almost impossible to get a hold of a human, let alone someone with that kind of insight. It makes me much more likely to buy from that company next time I’m looking for tires.