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-   -   swap in full-size spare? (http://www.jeepgarage.org/f73/swap-in-full-size-spare-23882.html)

1200RT-P 06-01-2011 10:15 AM

swap in full-size spare?
 
First I should confirm that I have a small spare tire - QT2 5.7, but no offroad adventure package. I'm pretty sure its a smaller spare.

Anyway, I will confirm that this afternoon.

I drive about 20k miles a year, and would like the confidence of a full size spare. Has anyone added a full size spare to their WK2 equipped form the factory with a small one?

Can anyone comment on the storage/fitment issues or cost?

dubwarren 06-01-2011 10:51 AM

I haven't tested this but it looks like a full size spare wouldn't fit where the spare sits currently. I think this was covered in some thread I few months back, but who knows?

I have an extra 20" wheel and would like to get a tire on it and load it in the back if it would fit but I doubt that it would go.

Hopefully someone has tried this and can share the results.....

Technosavant 06-01-2011 11:36 AM

Re: swap in full-size spare?
 
Outside diameter of the spare is the same as the ones fitted to the vehicle. Still, it's narrower... you aren't going to fit one that's the same size in that spot. These wheels are LARGE. Trying to haul one around is going to impact your cargo capacity in a measurable way.

Still, I can think of one time in the last ten years or so when I actually needed to use the spare tire, and even then I was within a couple blocks of a tire shop when it happened. I can understand wanting a regular size spare if off roading, but when running around on-road, it's just not likely that you'll need anything more than the emergency spare if you pick up debris big enough to cause an immediate flat.

1200RT-P 06-01-2011 12:08 PM

Re: swap in full-size spare?
 
Good points Technosavant .... i thought some WK2's came w/ full size spare? Wouldn't that fit in the well in the trunk?

Technosavant 06-01-2011 12:48 PM

Re: swap in full-size spare?
 
Quote:

Originally Posted by 1200RT-P (Post 423247)
Good points Technosavant .... i thought some WK2's came w/ full size spare? Wouldn't that fit in the well in the trunk?

There's "full size," then there's full size.

When we think full size, we think of the exact same sizing that's mounted to the vehicle. That would be one of the following sizes, depending on trim level and options:
P245/70R-17
P265/60R-18
P265/50R-20

Outside diameter on these wheels are all nearly identical.

The spare isn't one of those sizes; it's narrower, but it's the same outside diameter (otherwise, you'd have potential issues with the 4WD system when it wore a spare due to the different number of rotations over a given distance). So while it's "full size" in the sense of the outside diameter in order to protect the drivetrain, it is not the exact same size in all dimensions in order to reduce cost, size, and weight.

These wheels are big and heavy; IIRC, when I ordered up an 18" winter wheelset, each one ended up being something like 75 pounds. That 265mm section width is also 10.5 inches... that's a fair amount of size to have to cram under the cargo floor if you try to design it to hold one. Then there's the cost angle; a steel rim with a short term use spare is far cheaper than an aluminum rim and a regular tire meant to go tens of thousands of miles at up to 100mph. As in a few hundred dollars per vehicle.

Andrew Klossner 06-01-2011 01:38 PM

Re: swap in full-size spare?
 
Quote:

Originally Posted by 1200RT-P (Post 423247)
I thought some WK2's came w/ full size spare? Wouldn't that fit in the well in the trunk?

Yes, I have a full-size spare in the well of my trunk thanks to the off-road package. Do I have a different well?

I just noticed that the owner's manual contradicts itself about the full-size spare. Page 404 says:

"The spare tire of your vehicle is equivalent in look and function as the original equipment tire and wheel found on the front or rear axle of your vehicle. This spare tire may be used in the tire rotation for your vehicle."

But page 405 says:

"The full size spare is for temporary emergency use only. This tire may look like the original equipped tire on the front or rear axle of your vehicle, but it is not. This spare tire may have limited tread life."

This looks like another case where Chrysler cut and pasted text from two different older manuals. I don't know which to believe.

1200RT-P 06-01-2011 02:38 PM

Re: swap in full-size spare?
 
just to be on the same page ... i dont need/want a full 5th wheel with alloy wheel. a steel spare that I could drive 100 (if needed) would be nice.

then again, i agree - i haven't had a major tire issue in 50k+ miles, and i'm rarely far enough from civilization to need one.

Andrew Klossner 06-01-2011 03:43 PM

Re: swap in full-size spare?
 
In my previous ride, I had seven flat tires in 200,000 miles, four on pavement and three on gravel. Four of those were out in the boonies, nowhere a tire shop.

I'm happy to have a full-size spare. And I'm pleased that it doesn't ride on the back of the hatch or under the chassis.

ternst 06-01-2011 04:41 PM

Re: swap in full-size spare?
 
One of my regular tires/wheels is riding in the spare tire compartment since the tire blew out after only 6,000 miles, so obviously a fullsize spare or tire and wheel will fit just fine...

Dunecrawler 06-06-2011 01:47 AM

Re: swap in full-size spare?
 
The 20" (265/50) does NOT fit, it is too wide. I tried

Ernest 06-09-2011 12:22 AM

Re: swap in full-size spare?
 
I believe it's been determined (in the Suspension/Driveline/Brakes/Wheels forum) that up to a 265/65/18 tire & wheel (31.5" diameter) will fit in the spare compartment and still allow the lid to close completely. Not sure if any of the 20's will fit, however.

JayB 06-09-2011 11:49 AM

Re: swap in full-size spare?
 
A 265 width will fit with stock wheel. Up to 32" diameter will fit (some say with or without the plastic cargo buckets). I have a 255/70/18 in there.
275 section width is too wide and won't allow for the hatch to fully close.


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