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  #13  
Old 05-12-2015, 10:59 AM
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Re: Oversized spare tire for GCs with bigger tires

Apologies in advance for the bump of a 1 year+ thread...

Goonbash - do the 275/65r18 Duratracs rub at all for you when off road, or when jeep drops into aero mode? Did you try putting that 275/65R18 in the tub while under inflated? I carry an electric air pump, so under inflating a spare to fit tub and inflating if/when needed wouldn't be a problem.

Anyone - not really the subject of this thread... but I'll try. Do you guys see any advantage/disadvantage in running a taller, narrower tire? My thought is doing so to get as much increase in ride height as possible while not rubbing in turns. Plus, I've heard that in off road snow it's better to have a narrower tire to reduce float and get better traction. Thoughts?

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Old 05-12-2015, 06:05 PM
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Re: Oversized spare tire for GCs with bigger tires

Gofastr,

Not sure if you read the first couple "posts" in this thread about fitting a full size spare? If not, might want too. The DuraTrac in that size is an LT tire (Light Truck), going to be pretty tough trying to squeeze a deflated tire in there.

No, the 275/65/18's do not rub in "Sport/Areo, or Park" mode.

As for a taller, narrower tire for wheeling in the snow... If you are wheeling offroad and snow conditions are that deep and crappy the only advantage of a narrower tire (and rim) is that it gives you more clearance for chains.

I'm going to guess that 95+% of the time you wouldn't be wheeling your GC offroad in conditions that you would even notice or warrant a narrower tire.

My 2 cents.
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  #15  
Old 05-12-2015, 07:36 PM
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Re: Oversized spare tire for GCs with bigger tires

Quote:
Originally Posted by Gofastr View Post
Apologies in advance for the bump of a 1 year+ thread...

Goonbash - do the 275/65r18 Duratracs rub at all for you when off road, or when jeep drops into aero mode? Did you try putting that 275/65R18 in the tub while under inflated? I carry an electric air pump, so under inflating a spare to fit tub and inflating if/when needed wouldn't be a problem.

Anyone - not really the subject of this thread... but I'll try. Do you guys see any advantage/disadvantage in running a taller, narrower tire? My thought is doing so to get as much increase in ride height as possible while not rubbing in turns. Plus, I've heard that in off road snow it's better to have a narrower tire to reduce float and get better traction. Thoughts?
Just put a 255/70/18 in the spare well, it fits, fully inflated, and is the same diameter as the 276/65.
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Old 05-12-2015, 08:18 PM
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Re: Oversized spare tire for GCs with bigger tires

The 275/65/18 tire is a wider tire, which doesn't allow the cover to close correctly. Also, depending on manufacturer, tires of the "same" size can differ by a fair amount.

255/70/18 vs 275/65/18 and differences

Diameter inches (mm)
32.06 (814.2)
32.07 (814.7)
0.02 (0.5) 0.1%
Width inches (mm)
10.04 (255)
10.83 (275)
0.79 (20) 7.8%
Circum. inches (mm)
100.7 (2557.88)
100.77 (2559.46)
0.06 (1.57) 0.1%
Sidewall Height inches (mm)
7.03 (178.5)
7.04 (178.75)
0.01 (0.25) 0.1%
Revolutions per mile (km)
629.17 (390.95)
628.78 (390.71)
-0.39 (-0.24) -0.1%
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  #17  
Old 05-13-2015, 06:03 AM
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Re: Oversized spare tire for GCs with bigger tires

Quote:
Originally Posted by XJ97SPORT View Post
Gofastr,

Not sure if you read the first couple "posts" in this thread about fitting a full size spare? If not, might want too. The DuraTrac in that size is an LT tire (Light Truck), going to be pretty tough trying to squeeze a deflated tire in there.

No, the 275/65/18's do not rub in "Sport/Areo, or Park" mode.

As for a taller, narrower tire for wheeling in the snow... If you are wheeling offroad and snow conditions are that deep and crappy the only advantage of a narrower tire (and rim) is that it gives you more clearance for chains.

I'm going to guess that 95+% of the time you wouldn't be wheeling your GC offroad in conditions that you would even notice or warrant a narrower tire.

My 2 cents.
Thanks XJ,
Yup, read through the thread (and the link to your TH mods - nice ride).

Since you mentioned the Silent Armor 265/60's fit in tub (w/o trays) and one could force lid to close, I haven't found where anyone has commented on getting 275/65s into the tub, and 255/65/18 fits (i.e. the 32" diameter seems ok going into the tub), my question about deflating 275/65's to get them in there.

You do have the Duratracs on (nicely pained) stock 18x8's, yes? I think you noted you've got ~ 1/2 clearance to knuckle with those - does that change with ride height? Root of my question is that I'm wondering if these 275/65s on stock 18s would allow me to run chains in raised mode. Though I'm closer to 5%+ in terms of miles in conditions tha warrant chains (no, this isn't my daily driver... and I get into the hills in the winter a lot!), I agree that wider (with room for chains) is better than narrow.
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Old 05-13-2015, 05:19 PM
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Re: Oversized spare tire for GCs with bigger tires

Quote:
Originally Posted by Gofastr View Post
Since you mentioned the Silent Armor 265/60's fit in tub (w/o trays) and one could force lid to close, I haven't found where anyone has commented on getting 275/65s into the tub, and 255/65/18 fits (i.e. the 32" diameter seems ok going into the tub), my question about deflating 275/65's to get them in there.
Well... unless Jeep enlarged the '14 and up GC tubs there ain't no way a 275/65/18 DuraTrac is going to fit in the '13 tub without making modifications, deflated or not.

Quote:
Originally Posted by Gofastr View Post
You do have the Duratracs on (nicely pained) stock 18x8's, yes? I think you noted you've got ~ 1/2 clearance to knuckle with those - does that change with ride height? Root of my question is that I'm wondering if these 275/65s on stock 18s would allow me to run chains in raised mode. Though I'm closer to 5%+ in terms of miles in conditions tha warrant chains (no, this isn't my daily driver... and I get into the hills in the winter a lot!), I agree that wider (with room for chains) is better than narrow.
Yes, bought an extra set and powder coated them and mounted the DuraTracs.

As for running "chains" on the front with a 275/65/18 tire, "no" they won't fit! With smaller tires it could be possible, but I'd have to question why and where you'd be wheeling your GC that you need to be running chains on all four corners. I'd recommend looking for a different rig for that kind of wheeling.

Pics are from the left front, with it in the fully raised position, 4Lo, Rock setting.

And "no" clearance between tire and knuckle doesn't really change.
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  #19  
Old 05-13-2015, 05:45 PM
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Re: Oversized spare tire for GCs with bigger tires

Yeah, that's close XJ - no chain will fit there. Thanks for the pics.

Why/where chains? 4th season elk hunting all over Colorado, where it's not uncommon to get 2-3' of snow in a storm. If I'm fortunate enough to be successful, I just throw my elk in the back of the GC...
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