Spare for 19x10 285/35 square setup (with PP)

[valentinoamoro]

I am interested in purchasing a spare for my 15 GT PP. Too many issues with getting stuck on the road with a blown tire and a semi-reliable can of glue. I also would hate waiting for a flat bed if that doesnt work and have to stay at a motel.

The issue with finding a space seems to be:
1) matching the bolt pattern
2) clearing the brakes (not an issue with a square setup)
3) fitting it in the wheel well in the trunk. This includes both diameter and width.
4) making sure the diameter of the spare (wheel and tire) is the same as the wheel and tire it replaces so that the torsen doesnt break.

A lot of folks are running a square setup here - specifically a 19x10 285/35. For them, the spare will be different than those running staggered (one of the many advantages of running square).

Tire rack shows the diameter of the wheel and tire package of this to be 26.9 inches, which is different (smaller) that stock PP (front or rear).

I looked for tires with matching dimensions and found the configuration that is the same diameter (so it doesnt stress out the differential) is 225/45/19.

If we got a 7-8 inch wide 19 inch wheel with the same bolt pattern, would it fit in the wheel well and could it work as a spare?
Also, would a 19x10 285/35 (ET 35 ish) fit in the trunk if we had to mount the spare?

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[NightmareMoon]

I'm in the same boat.

FWIW, the 19x10 +35 with a 285/35 MPSS will fit in the trunk wheel well, just rides about 6" high due to the width so you will loose a bunch of trunk room. I can still fit a good sized suitcase or tool box above the tire, thanks to the generous trunk in the 'stang.

If you're willing to give up trunk space (only for long trips perhaps?) you can fit a full sized spare in the wheel well and run it anytime you want. Just remember to make sure the lugs fit the different wheel or that you have a set with you that does.

Personally I'm also hoping someone will make us a true spare.

 

[shawn3210]

Interested as well. I have a leftover front wheel from my pp rim set that I thought about cutting down to make into a spare.

 

[Slikk]

waiting to hear from a guru....

 

[Paul@PKAUTODESIGN]

19X10 et 35 with a 285 could fit but it would take up the whole trunk pretty much.

 

[uglygun]

Whatever size your rear tires are match that.

If you are a PerfPack car you dont want to have mis-matched diameters in the rear with a torsen diff.

 

[earlingy]

I copied another guy on the forums here and got a Hyundai Equus spare that fits just fine. You will have to get the hub machined out, and find some lugs that work for it. It fits in the spare tire well, you can even fit the compressor, jack, and tools under it. The trunk floor still sits flush. Here is my spare tire thread with all the info you should need. Honestly though, after doing all that work, I'd just buy the stock spare kit, and a 5mm spacer. Then if a front tire goes flat, you put the spare on the rear and move a rear to the front with a 5mm spacer. If a rear goes flat you still just put the spare on the rear.

Members of this forum contacted Ford and Torsen about the diameter thing, and Torsen verified that up to a 20% difference in tire diameter will not hurt its differential. This only applies to a OEM spare, as the Hyundai spare is the same diameter as the rear.

As others said, the problem you're going to have with a 19x10 is that it will take up a ton of trunk space. My spare is 19x4 and if it were a half inch thicker, you couldn't put the floor back in. If you don't mind losing basically all your trunk, a 19x10 will sit in there and be 6" higher than the floor was. Too bad we can't bolt it to the back like a Jeep, eh? A full size spare would be sweet.

 

[earlingy]

Here is the response from Torsen.

 

[valentinoamoro]

Thanks.The steps for the Hyundai Eqqus wheels are a major PITA.
>So @earlingly, what I hear you say is just buy the regular spare from Ford and move the rear wheel to the front?

>Why is the 5mm spacer needed if we are running a square setup? With the 19x10 square, no spacer is needed in the front to mount the rear wheels (usually, depending on wheel offset).
Additionally, the 19x10 is 26.9 inches Vs 27.7 of the factory PP 275/45/19, meaning, it will be even closer to the diameter of the OEM spare wheel!

>Do you know what that is for the wheel and tire?

 

[earlingy]

Oh, right, duh me. You don't need a spacer if your rear wheels go on the front without one. I was just talking for the original 19x9.5 PP rear wheel. That is based on the offset of your wheels and size of the tires.
The Equus wheel is a good solution but definitely more work than just using the Ford spare on the rear, and possibly having to change two wheels out. If I did it all over I'd probably just order the OEM one.
I don't know what size the OEM Ford tire is but I assume it's close to the base car's tire circumference, what's that, a 235 /50-18? MPSS in that size is 27.3" diameter.

 

[valentinoamoro]

Oh, right, duh me. You don't need a spacer if your rear wheels go on the front without one. I was just talking for the original 19x9.5 PP rear wheel. That is based on the offset of your wheels and size of the tires.
The Equus wheel is a good solution but definitely more work than just using the Ford spare on the rear, and possibly having to change two wheels out. If I did it all over I'd probably just order the OEM one.
I don't know what size the OEM Ford tire is but I assume it's close to the base car's tire circumference, what's that, a 235 /50-18? MPSS in that size is 27.3" diameter.

Diameter of Ford spare is 25.3 inches (I looked it up online). 285/35/19 is 26.9 inch. So the difference is 6.3%. Well within Torsen range it seems for rear wheel.

Great option!

 

[earlingy]

You could also looks for other tires to put on the Ford spare wheel if a 6% difference bugged you.
Also, I don't know where the interference is on the front wheel or what all everyone has tried. Maybe it would fit up front with a large (1"+) spacer? Then at least you wouldn't have to swap out a front and rear on the side of the road.

 

[valentinoamoro]

You could also looks for other tires to put on the Ford spare wheel if a 6% difference bugged you.
Also, I don't know where the interference is on the front wheel or what all everyone has tried. Maybe it would fit up front with a large (1"+) spacer? Then at least you wouldn't have to swap out a front and rear on the side of the road.

The 6% diff really doesnt bother me. That said, I will be running stock wheels and tire size in the winter, so might take your suggestion and get the taller size tire (assuming its even available)

Yeah, not sure how much interference there is with the Brembo brakes in the front and the minimum spacer size. Another issue depending on the spare wheel design in the length of the stock studs. Until someone experiments, the best option might be just to move rears to front if needed. I have the Steeda jacking rails, so its possible to raise the entire side of the car to do the F/R swap in one shot (in case its the front that blows).

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