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Roki303 02-02-2013 07:32 PM

Compact vs Full Size Spare TIre
Can somebody tell me what is the difference between:
"Compact full-diameter spare tire" (standard on Laredo, Laredo E and Limited) and "Full-size spare tire" (standard Overland and Summit).

What is exactly "full-diameter"? I would imagine both spares are not the same as normal wheels. If they are the same diameter is the difference the actual tire width?

If somebody has any photos that could be posted it would be great.

Hacksaw 02-02-2013 07:34 PM

Think donut spare only the same diameter as the real wheels...a full size spare is the same tire as the others on a steel wheel.

Think Outside !- No Box Required.

ColdCase 02-02-2013 07:55 PM

Re: Compact vs Full Size Spare TIre
The full size spare is a slightly narrower OEM 18 inch tire on an 18 inch wheel, regardless of road wheel size. Compact is a donut same diameter but a lot narrower with a 50 mph speed limit.

Roki303 02-03-2013 11:40 AM

Re: Compact vs Full Size Spare TIre
Got it, thanks a lot.

Truck11 02-06-2013 03:50 PM

Re: Compact vs Full Size Spare TIre
You cannot tow with the donut spare. The full size spare is pretty much a regular tire/rim combo.

Jeep_addicted 02-11-2013 11:08 AM

Re: Compact vs Full Size Spare TIre
The full size spare uses a sized tire 245/60/18 which is still smaller than the 265/60/18 size tire.

mickey53usa 04-01-2013 10:18 AM

Re: Compact vs Full Size Spare TIre
Yep, just found this out - Thought that I had an un-repairable tire (at least at Firestone Store), took to a different company (who fixed the tire) and found out that the spare was a 245 and not a 265 (even a different brand). Tried to trade the spare to the tire dealer for a matching tire of brand and size and he told me since it was an off size tire that he did not want it and that the standard size tire (265) would not fit properly in the spare tire area - go figure

Jeep_addicted 04-02-2013 08:05 AM

Re: Compact vs Full Size Spare TIre
How is the 245/60 18 and off tire when it is the standard size for the 2011 up Ford Explorer with 18" the problem is its a Kumho. If you wanted to tires to match your other michelins then michelins has that same tire on the Equinox and Explorer.

tomster 01-18-2016 09:43 AM

Re: Compact vs Full Size Spare TIre
I just picked up a used 2014 Overland with 265/50R20 tires. I think it comes with a "full size" spare. The manual is a little confusing. It starts by discussing the Run Flat Tires on the SRT only. Then a Note: the compact tire is to be used on the rear wheel if you get a flat on the front, you need to switch the good back to the front and put the spare on the back.

Does this include the Overland, also?
Is there any spare that can be used front and back?

Also...I have a plug in the front right tire, can I safely air this tire down for driving on the beach?

Jim_in_PA 01-18-2016 12:54 PM

Re: Compact vs Full Size Spare TIre
Both spares have to be the same outside diameter as the regular tires for a 4WD vehicle. The difference as noted is the duty cycle they are capable of. The "donut" is only good for basic vehicle use to get you where you need to go to repair or replace a damaged regular tire. The "full size" spare has the same duty rating as the regular tires and therefore can be used for the increased loads that come with towing, etc. The narrower tread is merely to help it fit in the space allotted and reduce the cost, but it has the same weight and capacities as the wider normal tires.

If the manual says not to run with the "donut" on the front that's likely for stability but it would be a real exercise for someone out on the road to be able to switch tires around with just the OEM jack... ;)

tomster 01-18-2016 02:28 PM

Re: Compact vs Full Size Spare TIre
Thanks, Jim.

That's what I'm thinking, requiring a driver to switch tires and then install a spare could be quite the chore depending on where you get the flat.

I'm rereading the manual. The "compact" tire that comes with the SRT and it's full size run flat tires, I think this compact can't be used on the front, so a person would rely on the run flat feature till at a shop. For the "full size" spare, like on the Overland, maybe any wheel, front or back, is good. Just like you say, to get you to a repair shop...

Womsirom 01-18-2016 02:58 PM

Re: Compact vs Full Size Spare TIre
Yeah...I had the joy of finding out what a 'full sized' spare means for the SRT on Xmas eve. It doesn't fit on the front...the brakes get in the way.

I assumed it only went on the rear as I was changing a wheel in the basement at work and in the Aussie summer that means very warm conditions. The wheel was ok enough for me to get to the wheel place thankfully.

Seems a slight pain to have to fit the rear to the front and place the spare on the rear...but I guess the SRT crew got the GC as is and added the massive wheels to the car for our benefit...they just don't have enough room to fit in the boot. The full size spare is a good few centimeters more narrow than the chunk of rubber supporting the beast currently.

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