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Old 01-22-2017, 03:09 PM
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Warning: largest tire size for EcoDiesel Summit is *not* 275/55/20

This is a warning for others with EcoDiesel Summit models. The common knowledge is that the largest tires that will fit on a stock WK2 is 275/55/20.

Having just installed some Nokian Rotiiva ATs in 275/55/20 on my 2014, I cannot recommend this size. The passenger side front wheel well liner will make contact with the tire and rub if the wheel is turned. Driving ~5 miles home from the tire installer, I proceeded very gingerly in Off-Road 1 and by the time I arrived the tire had rubbed a hole in the liner.

"So what?" you might say, "It's just the flimsy liner." Not so. If you look at the front wheel wells you will notice that the passenger side liner impinges more into the wheel well than does the driver side. Less clearance on the passenger side? Why might that be? Oh, it's just the QuadraLift air lines and a few wire harnesses that are pressing on the liner.

This isn't an idle concern:
Quote:
Originally Posted by Exposed View Post
Got home and drove back up on the blocks, and started looking for a problem. I saw the air compressor is mounted in the right front wheel weld. Immediately I saw the problem. The cheesy wheel weld (cardboard covered carpet- something like that) was loose from the cover that is removed had flopped up against the tire going down the road. At this point it pretty much destroyed the lower half about a foot up. With that out of the way, apparently that wheel weld holds the air lines going to the air boots in place. Once that was gone, they could not go anywhere except right up against the tires. Needless to say, both the air lines going to the bad and rubbed in two...
Quote:
Originally Posted by Exposed View Post
The wheel welds provide absolutely no protection to the nitrogen lines. I am sure many people will never have this happen but for sure it will cost alot to fix
Note that Exposed didn't run larger tires, all he did was drive his EcoDiesel Summit on the highway without the felt liners fully affixed. That's enough to kill the air suspension hoses. Way to go, Jeep engineers: you chose to make a *load bearing* flimsy liner responsible to protect the QuadraLift lines from destruction by the tires.

Fortunately, no damage done to my air suspension (yet). I spent about an hour carefully securing the various hoses and harnesses with redundant 75-lb test weight zip ties anchored in three different spots to try to withdraw the hoses from the wheel well and secure them. Hopefully this won't stress the QL compressor or cause any leaks in the hoses from being slightly torqued forward. I then built an anchor plate of plastic to allow that area of the liner to be drawn forward. Also, FWIW, the tires come *very* close to the liner on the driver side when the wheel is turned to the limit in Normal height. No QuadraLift stuff over there, but the wiper fluid tank lives right behind the liner.

I haven't yet tested the vehicle in Aero mode, but I'm certainly cringing a bit at the thought. Entry/Exit mode basically causes the tires to touch the liner even when the wheels are turned straight on.

Are you getting the sense that these tires make me nervous? Heh. This may be specific to the EcoDiesel, which we all know crowds the engine compartment and may displace some of these components as compared to the Pentastar & Hemi models.

The stock Forteras are 265/50/20; these are 275/55/20's. The overall difference in diameter is 1.5" and the difference in width is 0.4". That's a 5% increase in the diameter and 4% increase in width—that's how close the clearances are.

Here's the "after zip tie anchoring" for the passenger side:

Passenger side liner prior to anchoring w/ forward traction, exhibiting from the inside of the liner the erosion that occurred very swiftly:

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Old 01-22-2017, 05:24 PM
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Re: Largest tires for EcoDiesel Summit

Well, so far the liners seem to be holding after a brief excursion in Aero mode. I'll have to check these daily for a week or so to ensure that it doesn't erode into the washer fluid reservoir or kill my QL suspension.
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Old 01-22-2017, 05:59 PM
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Re: Largest tires for EcoDiesel Summit

Same size in GY Adventure ATs....only had slight rubbing at the back of the rear wheelwells in aero. Nothing rubs now that that area has worn away. Hard cranked all the way over the curb to get out of driveway...no rubbing.

Done a little off-road....got a little twisted up....no rubbing noticed when I did a tire rotation a few weeks ago.


You have stock wheels?
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Old 01-22-2017, 06:39 PM
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Re: Largest tires for EcoDiesel Summit

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Originally Posted by dayne66 View Post
You have stock wheels?
Yes, I have the stock 20" wheels. My rear wheels don't rub. Do you have a 2014+ EcoDiesel Summit?
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Old 01-22-2017, 07:54 PM
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Re: Largest tires for EcoDiesel Summit

Thanks for the heads up, Roadkill. I have to look at my setup and see what's there. Even if I have room, that flimsy liner doesn't offer much protection, and if any mud or rocks get kicked up there, it could mean trouble. And what about snow chains?

We may need a shield, like from Dom or Rex Shield. Or maybe the zip tie solution will be good enough.
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Old 01-22-2017, 08:07 PM
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Re: Largest tires for EcoDiesel Summit

Quote:
Originally Posted by Roadkill View Post
Yes, I have the stock 20" wheels. My rear wheels don't rub. Do you have a 2014+ EcoDiesel Summit?

Yep...2014 3.0


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Old 01-22-2017, 09:04 PM
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Re: Largest tires for EcoDiesel Summit

Quote:
Originally Posted by echo7tango View Post
We may need a shield, like from Dom or Rex Shield. Or maybe the zip tie solution will be good enough.
Exposed made one that looks great, after paying $800+ for his QuadraLift repair (he took that in stride far better than I would have). Photos here:
2014 Summit Front Tow Hooks

After seeing this configuration on my own vehicle, I'd pay for a shield. I will say that those QL lines aren't as flexible as I would like when it comes to putting them in traction. They are stiff and really want to push out into the wheel well (hence the liner displacement). The wire harnesses nearby (ParkSense, fog lights, etc) are more compliant. I hope the expensively sealed, closed-circuit QL system doesn't start leaking due to the torque on the lines.

As for a shield, it would probably need to have a plastic lining or some other solution to prevent rattle. If you look at the QL compressor you can see one end "floats" on a captive pin and has a rubber washer (putatively to attenuate the vibration while it is operating). Take a look at Exposed's post that I linked, the second shot shows the compressor, with the rubber isolation mount visible on the left. The QL compressor really does "bounce" readily on that mount. While the compressor doesn't contact the liner, I am guessing some vibration is going to be present on the lines.
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Old 01-22-2017, 10:42 PM
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Re: Largest tires for EcoDiesel Summit

interesting, i have 275 65/18's which should be slightly larger than yours ... have been running them for 10,000+ miles and that includes off-roading.

i do have BORA spacers, not sure if that's the difference or not
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Old 01-23-2017, 07:23 AM
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Re: Warning: largest tire size for EcoDiesel Summit is *not* 275/55/20

There's definitely a degree of variance in the available clearance from vehicle to vehicle... even identical ones. The highly flexible material the liners are made from, and things resting against them, can make quite a difference to the space within the wheel well. I noticed this on the two identical MY14s I've had.

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