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Unread 06-17-2014, 11:46 AM   #556
ColdCase
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Yeah, Dave2002ti knows his stuff but has a tendency to apply race or car analogies to a light truck type SUV where its a much different world. The rule of thumb for the WK2 type AWD is that tires should be the same tire model (tread design and formula mostly for safety) and within 3/32 NDS tread depth range of each other. That equates to a 3/16 inch diameter difference. Thats close to 0.2 inches diameter difference. There is some margin built in.

Its the difference in revolutions per mile that wears AWD components. If you run the ball park math, for example, a 0.2 inch difference gives you about 4 more revs per mile for the OEM WK2 tire size... some would say that effects transfer case gear/clutch wear long term. With 0.2 inch bigger tires on the rear over 20k miles, the transfer case clutches would slip/spin 140k more revolutions than it would have with same size tires (80k more revolutions plus factoring in a~3.5 dif ratio). Dunno about the significants of the wear, the clutches/gears do wear, and much of this kind of slip wear is at low load... but its more wear and tear than no slip. The clutches have a certain design life, they don't put much extra pad in as that cost $$. A 0.1 inch tire diameter difference equates to 70k revolutions of slip over a 20k mile distance.

There are no clutches in the base transfer case (QTI) so it becomes more of an issue of gear and axle joint wear and safety as putting different size tires on any vehicle can upset the handling at the edge... you need to know what you are doing... as many here seem to.

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Unread 06-17-2014, 03:39 PM   #557
Dave2002ti
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Why would you?

Quote:
Originally Posted by illtal View Post
Doesn't seem to be a problem, I've ran staggered fitments on various vehicles in my day, even FWD cars (slightly smaller less grippier tires in the rear). My dealer has seen the car and have driven it and in fact it is more feedback and more responsive and less wheelspin than the stock low resistance michelins (I have a diesel). Why would you care about a 1/10 of an inch on a 5k + lb car? you can wear way more than a 1/10 of an inch from riding around.

Lots of people seem to have a hair up their ***** when it comes to a particular vehicle, I get that and I understand that. Happens all the time. However your comment and your argument does not apply. The suspension/ABS/Wheel speed sensors will not notice 1/10 of an inch. The human eye can barely see it. The front is lower than the rear,

No tires are engineer as well as a motorcycle tire, and no one says hey you gotta take off that front when replacing the rear, the front has 1/10 less tread on it, and I assure you 1/10 of an inch is a lot on a bike if you are racing it (which I very much so enjoy).

Point is, there are no ill effects, conversely there are only benefits to my setup. I didn't go with 10" wheels all around because I was concerned about hydroplane resistance. I'm not so worried about tire wear, or rotating my tires. I find that no car will wear all tires evenly due to road camber and other external factors. In order to do so one must fight a battle rotating wheels/tires every 5k miles are so (I've done that too), and it's not worth it.

According to this the section width is 1.2 inches wider but the sidewall height is the same 5.2 inches


Actually there are ultra high performance just barely street tires that are better engineered than any motorcycle tire out there. Think about a GT3 or GT2 at around 200mph! Why would you increase your unsprung weight by almost 10lbs per wheel for no appreciable benefit other than looks for the street?? Also that 10lbs may cause problems down the road. Also are chances are the tires are actually heavier than spec sheet says.
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Unread 06-18-2014, 01:44 PM   #558
illtal
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Quote:
Originally Posted by Dave2002ti View Post
Actually there are ultra high performance just barely street tires that are better engineered than any motorcycle tire out there. Think about a GT3 or GT2 at around 200mph! Why would you increase your unsprung weight by almost 10lbs per wheel for no appreciable benefit other than looks for the street?? Also that 10lbs may cause problems down the road. Also are chances are the tires are actually heavier than spec sheet says.
My wheel and tire combination is lighter than any factory option: I have weighed these wheels/tires separately. I am too a racer just go a lot fasterer a like quickerer.
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Unread 06-20-2014, 04:19 PM   #559
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Got my Cooper Zeon LTZ's put on yesterday. P275/55R20.



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Unread 06-21-2014, 04:49 PM   #560
drcoopster
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Lightly-used Wrangler Sahara wheels and 255/70R18 tires (BFG Rugged Terrains were already mounted on the wheels and still have plenty of life left). Others have reported that these should fit just fine; I haven't driven it yet but there's enough clearance at full lock at the entry/exit QL setting.





(QL in OR2 height; it's really easy to get a 12T bottle jack underneath that way.)

Last edited by drcoopster; 06-24-2014 at 10:17 AM..
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Unread 06-23-2014, 06:41 AM   #561
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To all the folks running 275/65/18 or bigger, how are you storing your spare (assuming a full size spare).
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Unread 06-23-2014, 08:09 PM   #562
Robb286
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I decided to run a old set of 265/65/17 at2s on moabs for now until I could afford a new set of meats.. I'm digging the look tho!
image-1284265237.jpg

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Unread 06-24-2014, 06:36 AM   #563
03svt4life
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wheel question

I bought 2011 jeep grand cherokee, looking at 2.5 lift, wanting to add wheels/tires...maybe slightly stick out and larger. looking at xd806 20x9 with 30mm offset on some 275/55r20 tires. will they fit and is the offset right for what i am looking for?
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Unread 06-26-2014, 11:13 AM   #564
jb12wk2
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Quote:
Originally Posted by Robb286 View Post
I decided to run a old set of 265/65/17 at2s on moabs for now until I could afford a new set of meats.. I'm digging the look tho!
any rubbing issues Rob? im considering going up to 265/70/17's when i'm ready for tires
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Unread 06-26-2014, 12:59 PM   #565
2013hemijp
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Quote:
Originally Posted by illtal View Post
See Pix


Nice wheels!!!! They look great!
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Unread 06-26-2014, 04:59 PM   #566
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Can this fit 235/30/ZR22?
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Unread 06-27-2014, 02:20 PM   #567
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Really great to see all the different combos of tire n rims.
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Unread 06-27-2014, 05:31 PM   #568
Robb286
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Quote:
Originally Posted by jb12wk2
any rubbing issues Rob? im considering going up to 265/70/17's when i'm ready for tires
Nope nothing so far, I have 1.5" spacers tho. I don't think you'll have any problems with the 265/70s
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Unread 07-01-2014, 11:12 AM   #569
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Quote:
Originally Posted by Robb286 View Post
Nope nothing so far, I have 1.5" spacers tho. I don't think you'll have any problems with the 265/70s
perfect, from what ive read here it should be ok even if i don't lift right away. thanks bud!
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Unread 07-01-2014, 11:21 AM   #570
jimb0JP
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New Tire Report

I have replaced the 265/50/20 Goodyear Fortera tires on my 2012 Jeep Grand Cherokee Altitude’s 20”x8” rims with 285/50/20 General Grabber UHP tires on all four corners and can report they fit with no issues…no rubbing or clearance problems with the upper control arms. According to the speedometer calibration calculator, the speedometer error at 65 mph should be 1.68 mph, and my speedometer was reading one mph higher than the actual speed previously, so it should be closer to the actual speed now. The tires have a V-tread pattern which is really great for handling standing water on the road (which we have a lot of down here in Florida’s rainy season), and they really look great on the vehicle. I’ll post some pictures of them along with the other modifications I have recently made to the vehicle.
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