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  #37  
Old 02-13-2015, 07:18 AM
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Re: Goodyear Wrangler All-Terrain Adventure

Useless for a five wheel rotation, yes. However, is it useless for use in an emergency? That is to say, would it cause damage in a QDII equipped Jeep if one had to drive, say, 50 miles?[/QUOTE]

Absolutely! How will you know you need to drive only 50 miles?? Are you physic?? You may need to drive 100 or 200 miles while on a road trip somewhere! Hope you never get a flat . . .

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  #38  
Old 02-13-2015, 08:30 AM
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I stand corrected, was unaware that they had a different diameter. However, It will suit Me just fine as a spare tire. I do not have QLII...
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  #39  
Old 02-13-2015, 08:39 AM
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Re: Goodyear Wrangler All-Terrain Adventure

Quote:
Originally Posted by rs153719 View Post
Not really sure where your going with this: I have 265/65/18 wheels installed with a 265/65/17 spare. That's the exact same wheels but with an inch smaller rim.

265/65/17 is 30.6" OD (265/25.4*.65*2+17)
265/65/18 is 31.6" OD (265/25.4*.65*2+18)

Its exactly 1" larger...due to the rim being 1" larger. Width is the same for both at 10.43" (265/25.4) and the aspect ratio is the same at 65% but the OD is larger due to the rim.

If you don't trust me or my math, go here and put both sizes in:
Tire Size Comparison

A 1" difference would probably cause damage to the AWD systems/diffs. Not sure what the exact spec is for Jeep but my wifes Q7 states right in the owner's manaul that OD difference can't be more than 0.4" or it will cause issues...
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  #40  
Old 02-13-2015, 08:45 AM
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Quote:
Originally Posted by ljn21 View Post
265/65/17 is 30.6" OD (265/25.4*.65*2+17) 265/65/18 is 31.6" OD (265/25.4*.65*2+18) Its exactly 1" larger...due to the rim being 1" larger. Width is the same for both at 10.43" (265/25.4) and the aspect ratio is the same at 65% but the OD is larger due to the rim. If you don't trust me or my math, go here and put both sizes in: Tire Size Comparison A 1" difference would probably cause damage to the AWD systems/diffs. Not sure what the exact spec is for Jeep but my wifes Q7 states right in the owner's manaul that OD difference can't be more than 0.4" or it will cause issues...
Dude, it's a spare tire not my daily driver... Roadkill summed it up nicely before your post. A 1" difference in my spare is tolerable until I can reach a repair shop. No difference than running a donut

And for the record, I admit that I was wrong... I learn something new everyday.
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  #41  
Old 02-13-2015, 09:24 AM
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Quote:
Originally Posted by ljn21 View Post
A 1" difference would probably cause damage to the AWD systems/diffs. Not sure what the exact spec is for Jeep but my wifes Q7 states right in the owner's manaul that OD difference can't be more than 0.4" or it will cause issues...
Thanks. This was a useful reply, unlike one of the previous replies. It seemed plausible that the diff in QDII could compensate to a certain degree.

Furthermore, it's not like the "full size spare" that shipped with the Jeep is an exact diameter match anyway. So, implicitly we know that 0.1" diameter difference is acceptable, given that's what Chrysler delivered with the vehicle... what's the official upper limit in OD size difference?

Getting a matching fifth rim + tire isn't something I want to do. Furthermore, I'd like it to fit on the existing spare rim and in the storage compartment. It seems that a 255/70-R18 might be a decent compartment-fitting spare match for a 275/55-R20, for example. Presuming it fits that stock spare rim, that is...
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  #42  
Old 02-13-2015, 09:48 AM
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To sum up my spare situation, I had a donut.... I found a 17" laredo wheel for $50 then bought a used 265/65/17 tire to throw on it. Thought it matched the size of my 265/65/18 adventures but was wrong.
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  #43  
Old 02-13-2015, 10:11 AM
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Re: Goodyear Wrangler All-Terrain Adventure

Quote:
Originally Posted by rs153719 View Post
To sum up my spare situation, I had a donut.... I found a 17" laredo wheel for $50 then bought a used 265/65/17 tire to throw on it. Thought it matched the size of my 265/65/18 adventures but was wrong.
Yeah, looks like a 265/70-R17 is the best match in that scenario.

Tire sizes are stupid. There are three primary variables when sizing a tire: width, outer diameter, and rim size. So, what did they decide was the best way to describe this? Width in metric, rim size in imperial, and to omit outer diameter in favor of making people calculate that using an aspect ratio.
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  #44  
Old 02-13-2015, 10:43 AM
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Re: Goodyear Wrangler All-Terrain Adventure

Quote:
Originally Posted by rs153719 View Post
Dude, it's a spare tire not my daily driver... Roadkill summed it up nicely before your post. A 1" difference in my spare is tolerable until I can reach a repair shop. No difference than running a donut
There's a -3.17% difference in diameter between your 265/65/18 and 265/65/17, which will definitely create some problems for your transfer case if you use it as a spare, for any considerable distance...maybe even just 20 miles. I wouldn't risk it.

Not really "tolerable" as a spare, so you may want to reconsider that. But if you are assured you'll be fine, then by all means do so. But don't spread the misinformation it is the same as using the stock spare that comes with it, because that one actually matches OEM diameter.

You'd be much better off with a 265/70/17 as that's only a +0.14% difference between your 18" wheel setup. Just FYI.
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  #45  
Old 02-13-2015, 11:38 AM
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Re: Goodyear Wrangler All-Terrain Adventure

Quote:
Originally Posted by pinetar View Post
You'd be much better off with a 265/70/17 as that's only a +0.14% difference between your 18" wheel setup. Just FYI.
In fact, that's a closer match for his tires than the 245/65/18 "full sized" spare that Chrysler delivered in my Jeep for the stock 265/50/20's. That spare differs by 0.1" OD... 0.3%.

Quote:
which will definitely create some problems for your transfer case if you use it as a spare, for any considerable distance...maybe even just 20 miles. I wouldn't risk it.
Isn't this roughly equivalent to the issues with driving "part time 4WD" on pavement? If the diff (or lack thereof) keeps the other wheel rotationally locked then one has to rely on the tire slipping. Hence how those Toyotas with part time 4WD are restricted to using it on loose surfaces like dirt or snow where the tire can slip to match the rotation of the other tire during turns. Of course, an OD mismatch will affect the vehicle as it travels in a straight line, unlike the part time 4WD problem which affects turns.
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  #46  
Old 02-13-2015, 12:59 PM
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Re: Goodyear Wrangler All-Terrain Adventure

Quote:
Originally Posted by Roadkill View Post
Isn't this roughly equivalent to the issues with driving "part time 4WD" on pavement? If the diff (or lack thereof) keeps the other wheel rotationally locked then one has to rely on the tire slipping. Hence how those Toyotas with part time 4WD are restricted to using it on loose surfaces like dirt or snow where the tire can slip to match the rotation of the other tire during turns. Of course, an OD mismatch will affect the vehicle as it travels in a straight line, unlike the part time 4WD problem which affects turns.
Not sure about that. But as you said, driving in a straight line for a considerable distance is a lot different than part time 4WD that compensates for moments at a time instead of minutes or hours, in most cases.
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  #47  
Old 02-13-2015, 01:53 PM
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Re: Goodyear Wrangler All-Terrain Adventure

Quote:
Originally Posted by rs153719 View Post
Dude, it's a spare tire not my daily driver... Roadkill summed it up nicely before your post. A 1" difference in my spare is tolerable until I can reach a repair shop. No difference than running a donut

And for the record, I admit that I was wrong... I learn something new everyday.
Sorry just trying to help

I don't believe that even for a spare that it would be safe to run, I wouldn't risk it at all...

Most 'donut' tires maybe narrower in width but they are close to the same OD as the other tires. I don't remember which one of the many cars/trucks we have owned (Raptor maybe?) that said in the owner's manual that if the rear/drive tire was the flat, you had to first put the spare on the front/non-drive axle, then put that tire on for the flat on the drive axle...just pointing out that alot of manufactures know that different tire sizes on the same axle cause problems and should be avoided. No idea on the WK2 what the real tolerance is or what the diff's can actually handle, not sure I saw anything in the manual on it but haven't read it totally through yet.
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  #48  
Old 02-13-2015, 02:21 PM
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Quote:
Originally Posted by pinetar View Post

Not sure about that. But as you said, driving in a straight line for a considerable distance is a lot different than part time 4WD that compensates for moments at a time instead of minutes or hours, in most cases.
No, "part time 4WD" (at least as Toyota defines it) actually means "4WD without a center differential". The "part time" nomenclature is due to the fact that you can't leave it in 4HI on dry pavement if you value your transfer case. You have to switch it back to 2WD on pavement.

Part Time 4WD on Pavement

Ultimately, the problem is wheels wanting to rotate at different rates and this not being possible due to lack of a differential.

Using a different outer diameter spare seemed plausible for the same reason the Jeep can spin one tire at a different rate without grenading the transfer case it might be able to accommodate a tire that rotated at a different rate due to a different outer diameter. I believe QDII has an open diff in the front and an ELSD in the rear.
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