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  #13  
Old 06-03-2016, 09:48 AM
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Re: 18" Wheel and Tire Discussion Thread

Quote:
Originally Posted by bandwagn View Post
...+30 will give you about an inch more offset than the stock +56 (56-30=26mm=1")....
This is correct, however you need to keep in mind the rim width. Assuming you're using the same width rim, the offset is the only factor that will affect how far out the tire is pushed.
That said, I'll explain the rim width factor. If you have an OEM 18 x 8 rim with +56 offset, there is 1.79" from the face of the rim to the mount pad (6.21 inboard). If you buy an aftermarket rim that is 18 x 10 with a +30 offset there is 3.81" from the face to the mount pad (6.19 inboard).
The aftermarket rim may fit, because it won't hit the suspension, since the inboard distance is nearly unchanged. The issue though is the face of the rim (and outboard side of the tire) is pushed out 2" despite the offset of the new rim only looking like a difference of 1".

How did I get there, you ask? The offset is simply the distance off center that the mounting surface of the rim is located. So a +30 offset has the mounting surface of the rim 30mm outboard from center. If a rim is 10" wide, you'll have 5" inboard, and 5" outboard with a zero offset. To adjust for offset simply convert to inches (divide the mm by 25.4) and add/subtract that from 1/2 the rim width.
Make sense? If not I'll see if I can sketch something up.

Quote:
Originally Posted by leadfoot4 View Post
I believe you have that information backwards. 265/60 is stock, and a 65 series tire will be the "taller" one......
Also true assuming the same rim diameter is used. For example the stock 20 is 260/55/20, but the spare is on a 18. The spare size is 245/65/18. Even though the spare is a 65 series, it's the same diameter as the stock 55 series tire, because the rim and width differences.
To go expand on that, since the OP asked about what the metric designation mean. I'll use the stock 265/60/18 for example. The first number is the width of the tire in mm. Just convert to inches, as noted above, and you'll know how wide the tire is. Stock would be 265mm wide or 10.43".
The second number is the "aspect ratio", expressed in a percentage. The 60 just means the side wall is 60% of the width. You can do this in metric or SAE. Since we've already converted the width, I'll use SAE. Take that 10.43 x .60 = 6.25". That's the height of the side wall. When using this number to calculate tire diameter, remember to double it, becuse there's sidewall on both side of the rim.
The last number is the rim diameter, in inches. Yes, they decide to through a SAE number in the mix for some stupid reason.
There you have it. P-metic markings = width / % / rim

As with the offset, if that doesn't make sense I'll try to draw something up for you.

Quote:
Originally Posted by crombenevolant View Post
For the tires, I am a huge fan of the DuraTrac's. I have them on my RAM and they are well behaved on road, awesome off road, and wear pretty good. In the snow, they are hands down the best tire I have ever had.....
I couldn't agree more. I also had them on a Ram, and loved them. I currently have Mickey Thompson MTZ on my Ram, and while they're nice, the Duratrac was better.
One thing crombenevolant didn't mention is that on the road they are also shockingly quiet for a capable off road tire. By far the best truck tire I've had.
FWIW, I've also had BFG, which were also great tires. I just like the Duratrac a little bit better.

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  #14  
Old 06-03-2016, 01:53 PM
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Re: 18" Wheel and Tire Discussion Thread

I'm leaning toward a 3/4" spacer on my stock 18" rims and 285-60/18 tires. (I'll cut the studs) The tires will be about an inch wider and an inch taller. Limited selection in that tire size although I can find about four that would work great for what I want them for. This set up should keep me pretty much tucked behind the wheel opening lip but still fill the fender wells. 295-55/18 would be even better but tires in that size are rare as hens teeth.
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Old 06-03-2016, 04:18 PM
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Re: 18" Wheel and Tire Discussion Thread

3/4" spacers would be just about right - would be worth taking a chance if you're willing to cut down the studs if you have to

Unless you want the extra tire width, there are so many options in 265/65 and that still gives you +1" height over stock


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  #16  
Old 06-03-2016, 06:02 PM
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Re: 18" Wheel and Tire Discussion Thread

Quote:
Originally Posted by bandwagn View Post
3/4" spacers would be just about right - would be worth taking a chance if you're willing to cut down the studs if you have to

Unless you want the extra tire width, there are so many options in 265/65 and that still gives you +1" height over stock


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I'm actually looking for more width with minimal additional height. A taller tire will effectively raise the gearing (like a lower numerical number) and I want to keep all the low end torque I have with V6. All the power seems to be in the upper rpms. I can't find a 295/55/18 which would give me stock height but a good bit wider so next one down is 285/60/18. I want a medium aggressive A/T but not a mud tire, maybe a Cooper Zeon or a Nitto Terra Grappler. Snow is not a problem down here. I hunt on farms and paper co. property so loose mountain road terrain with some wet field roads of red clay that I want to float over.
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  #17  
Old 06-03-2016, 10:01 PM
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Re: 18" Wheel and Tire Discussion Thread

Quote:
Originally Posted by tommydonnelly View Post
I'm interested in the Michelin Defender LTX M/S in either 265/60 or 265/65. I drive on road most of the time (85-90%), but need good sneakers for Northeast winters. Anyone had experience with these tires? Cheers!!
I have the LTS m/s2 on my pickup, seems like they are pretty close to the defender. I recommended them. Good wear, have 25k on them and they still look new, plenty of tread depth left. Good wet and dry traction. As good as you would expect in mud, good enough for a slick fireroad.
Have not had them in snow yet.

I plan on putting them on the WK2 once we wear out the stock Michelin's.

I just don't even understand why 20" wheels are so common on these things. Tire choice is nothing, $40+ per tire more as well. We had to drive three hours to purchase our ecodiesel with 18" wheels.
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  #18  
Old 06-04-2016, 10:02 AM
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Re: 18" Wheel and Tire Discussion Thread

Quote:
Originally Posted by Governor View Post
I'm leaning toward a 3/4" spacer on my stock 18" rims and 285-60/18 tires. (I'll cut the studs).....
Just be careful with that, and make sure you've got sufficient thread engagement.
To have the full strength of thread you need 1.5 times the diameter of engagement. So for a 1/2" diameter stud, you need 3/4" of thread engagement (length of contact between screw and nut).

I'm not sure what the studs are on the Jeep, but if it's the same as the Ram, and Charger, it's 14mm. If that's the case you need .83" (or 13/16") of engagement for full strength.
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  #19  
Old 06-06-2016, 11:37 AM
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Re: 18" Wheel and Tire Discussion Thread

Decided to go with new wheels instead of spacers. Hopefully this link will take you to a picture of a Natural green Grand Cherokee like my 2011 Overland. 5 spoke chrome wheels.
CARiD Wheels Configurator
The wheels are Touren TR9 chrome, 18x8 with 40 offset. I'll get some 285-60-18 tires this fall like Cooper Zeon or something about that aggressive. I should have right at the same clearance to suspension that I have now, maybe a tad more, the wheel will move outwards about a half inch, the tires will be half inch wider on each side of rim, so the sidewall of the tire will be about one inch closer to the outside than they are now. Hopefully that will keep it tucked but fill out the wheel wells a little better.

Here's where I bought the wheels. Cheapest place I could find and free shipping.
http://www.summitracing.com/parts/tw...873c/overview/

Is anyone running 285-60-18 tires?
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Old 06-06-2016, 11:43 AM
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Re: 18" Wheel and Tire Discussion Thread

I don't think that first link works. Try this TOUREN® TR9 Wheels - Chrome Rims
Scroll down click configuration and see the wheels on a jeep. Change the jeep color to natural green and it looks just like mine.
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  #21  
Old 06-11-2016, 08:21 PM
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Re: 18" Wheel and Tire Discussion Thread

I've decided on Nitto Terra Grapplers in 285/60R18. However, I'm finding three different Nitto Terra Grapplers in the same size and with the same tread pattern but different load rating, warranty mileage, tread depth and max load. Two of the three are LT tires while the other isn't, I'm guessing P. One is Terra Grappler, the other two are Terra Grappler G2. Looking at the numbers, which is best for the Grand Cherokee in terms of ride, etc. while having the correct load range?
Compare Items GARRETT TIRE SERVICE Leesburg, AL (256) 526-8172
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  #22  
Old 06-11-2016, 09:19 PM
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Re: 18" Wheel and Tire Discussion Thread

The G2 is just the new version of the Terra Grappler. The load range really only comes down to a matter of what you use them for. If you don't need the heavier range, you can save a little bit on the purchase price, and a little on the weight of the tire by getting the lower load range tire. The lower load range will usually ride a bit smoother than the stiffer side wall of the high range. Though, similarly, the high load range tend to corner a little better due to the firmer side wall having less flex.

And just to give it a shot. I've got 4 Bridgestone Dueler A/T RH-S tires that are nearly new off a 2016 Sahara if you're interested. I bought them for the rims. I want a mud terrain instead of an all terrain tire, so I'm going to sell the tires. If you're interested they're 255/70/18. All 4 tires for $250 plus whatever shipping to AZ would be. I just put them on Craigslist today. I didn't put them in the classifieds here, because I don't have any photos with the paper of my user name and date on them yet. I gotta take some photos specifically for here, but until I get them listed here, this is what they look like.



Anyway, I had to take a shot. Back to the tires you asked about.
I've heard great things about the Terra Grappler. The G2 has a slighly more aggressive looking sidewall than the original. As far as I know the actual tread is about the same, they just added bigger ridges along the side to make it look a bit tougher.
I'm looking forward to seeing the Ridge Grappler, which is coming out soon, though that may be a bit more aggressive than you're looking for since it looks a lot like the Trail Grappler.
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  #23  
Old 06-11-2016, 10:37 PM
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Re: 18" Wheel and Tire Discussion Thread

Thanks for the offer but I will hold out for the 285/60R18. I just had a peek at those ridge grapplers. They look awesome. Thanks for the input on the terra grapplers.
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Old 06-11-2016, 10:46 PM
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Re: 18" Wheel and Tire Discussion Thread

You're welcome.
I ordered my new tires earlier today (BFG KO2), and was considering waiting to see when the Ridge Grappler was going to release. But alas, I am impatient and didn't want to wait without know how long it may be.
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