Last year I got a set of Rickson steel 19.5" SWR style wheels and 245/70R19.5 tires. A set of 4. Now I'm looking into the spare. My current spare is a stock 2006 Dodge wheel and tire, neither of which, has the load capacity I need. So, in my pursuit of attaining a 19.5" spare, I have a few questions;1. Will a 19.5" tire and wheel of the above mentioned size, fit under a 2006 Dodge 2500 4x4 diesel short bed truck? Is there enough room and will the crank/pulley device support the weight?2. I can find a Vision Heavy Hauler 81 Series Machined Clear Coat Wheel (19.5x7.5"/8x6.5") on Amazon;http://www.amazon.com/Vision-Heavy-Hauler-Machined-19-5x7-5/dp/B009F9MF82?ie=UTF8&colid=ZO07J7YSGGZ7&coliid=I1S1PLGSGD6YX0&ref_=wl_it_dp_o_pd_nS_ttlI'm pretty sure this is the size I need for my truck. Can anyone confirm that?3. Since I have steel wheels and the Vision wheel is aluminum, will I need different lug nuts for the spare? 4. Will the lug nut torque be the same value as with the steel wheels or is it different?5. Does the tire have to be the same size as the other 4? I don't plan on rotating it. If I ever use it, it will be only for long enough to fix my original tire or to replace the original tire. I'd like to use a smaller, lighter tire than the running size for a spare if it's safe to do so. Even a used tire if I can find a good one for a good price. Any thoughts or ideas would be appreciated on the topic. Discussion of the necessity of a spare can be in another thread if that's alright to keep things on topic here. I'm mostly just interested in the pros and cons of using an aluminum wheel and off sized tire for a spare considering my 4 tires in use.

How common is the 19.5" tire, i.e. how long will you have to drive on the spare?If you are using the spare as a get me off the road to the nearest tire store or campground, then a different spare should not be a problem with a couple of caveats. On the front will pose steering issues, on the rear it could cause problems with the limited slip. In newer trucks it would also effect sway control and the other automated safety systems.In this regard, the stock spare should work with a little extra effort of mounting the spare on the front and then moving the front 19.5" to the rear. If you want to continue on your way at highway speeds, the tires should be the same size or it will create steering, handling, and limited slip issues.

kohldad wrote:In this regard, the stock spare should work with a little extra effort of mounting the spare on the front and then moving the front 19.5" to the rear. This is what I would do.

You may have to kick up the size of the spare tire but I would just reuse your 17" rim. Look for a tire roughly the same diameter as your 19.5" ones. As Kohldad mentioned, if you have a rear blowout, take the front tire off and put it on the rear. Seeing as so little weight goes on the front axle with a camper, you won't have weight issues with a standard tire with 17" rim on the front. As mentioned, I wouldn't be doing a nascar race with a somewhat mismatched front but I'd feel comfortable to do a few hundred KM's at a slightly slower speed

On my Ford the 19.5 Vision and toyo 245/70R19.5 fits underneath just fine. The Visions come with a splined lugnut.

I appreciate the feedback. I never thought of using the stock wheel with a taller tire, then rotating to the front if a rear tire fails. It's just to get me into town and a good tire shop that can get me fixed up right after all. I guess I gotta go do some homework on what would make a good spare tire that somewhat matches my 19.5 diameter.

Spare tire requirements | Good Sam Community

17 Replies

kohldad
Explorer III
Jun 07, 2016
Newer truck stock tire of 245/70R18 is the 33.1 and the 19.5 should be 33.2. Plus the 18 has a load range of 3450 so gives you a bit more capacity. Plus it will fit in the stock spare tire location since to my knowledge Ram in the spare tire location.
Grit_dog
Navigator II
Jun 07, 2016
By the calcs, your tires are about 33" tall. Tape measure to verify.
Personally I'd pick up a used, larger 17" tire for the spare. Somewhere between a 285/70-75 and 295/70 17 is what you're after. Plus if you find the right one, they are rated close to 4klbs.
Maybe not the comfort level you're after, but guys run these tires all the time under heavy campers. But as mentioned, in the unlikely event you have a 19.5 go down, your up sized 17" spare will work fine on the front for as long as you need it to.
Also, for slow leak, nail in tire etc, a tire plug and a small air compressor is sooo much easier than changing a rear tire with the camper on. Unless you're prepared for that with a heavier jack too.
Ski_Pro_3
Explorer
Jun 07, 2016
I appreciate the feedback. I never thought of using the stock wheel with a taller tire, then rotating to the front if a rear tire fails.

It's just to get me into town and a good tire shop that can get me fixed up right after all.

I guess I gotta go do some homework on what would make a good spare tire that somewhat matches my 19.5 diameter.
Buzzcut1
Nomad II
Jun 07, 2016
On my Ford the 19.5 Vision and toyo 245/70R19.5 fits underneath just fine. The Visions come with a splined lugnut.
gbw
Explorer
Jun 07, 2016
You may have to kick up the size of the spare tire but I would just reuse your 17" rim. Look for a tire roughly the same diameter as your 19.5" ones. As Kohldad mentioned, if you have a rear blowout, take the front tire off and put it on the rear. Seeing as so little weight goes on the front axle with a camper, you won't have weight issues with a standard tire with 17" rim on the front. As mentioned, I wouldn't be doing a nascar race with a somewhat mismatched front but I'd feel comfortable to do a few hundred KM's at a slightly slower speed
boogie_4wheel
Explorer
Jun 07, 2016
kohldad wrote:
In this regard, the stock spare should work with a little extra effort of mounting the spare on the front and then moving the front 19.5" to the rear.

This is what I would do.
kohldad
Explorer III
Jun 07, 2016
How common is the 19.5" tire, i.e. how long will you have to drive on the spare?

If you are using the spare as a get me off the road to the nearest tire store or campground, then a different spare should not be a problem with a couple of caveats. On the front will pose steering issues, on the rear it could cause problems with the limited slip. In newer trucks it would also effect sway control and the other automated safety systems.

In this regard, the stock spare should work with a little extra effort of mounting the spare on the front and then moving the front 19.5" to the rear.

If you want to continue on your way at highway speeds, the tires should be the same size or it will create steering, handling, and limited slip issues.

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Spare tire requirements

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