If I carried a 245 front tire spare, could I also use it as an emergency spare on for the back tire?

Story:
I live in the remote four corners region. When we go on drives we are frequently 50-100 miles from civilization. I accept there are challenges with owing an exotic car out here. I am 350mi from the nearest AM dealer.

We were headed out on our yearly trip to the dealer. We always try to choose a different route so we can enjoy new roads and scenery. The beauty of driving out here is that there are literally 100s of miles of nearly deserted roads allow the car to be used to its full potential.

About 75 miles from home, and 40 miles from the nearest town, (my wife is driving) " the tire pressure warning light" "15psi", "12", "9". " I thought I saw something in the road, and felt a little bump" she said.

We pull over, I can hear the tire hissing. l get out the flat tire emergency kit. I turn on the compressor, ( with the goo bottle attached ) and it goes up a little and then starts hissing again. So I tell her to drive 100yds or so and maybe that will distribute the "goo" and seal the tire. Didn't work. So I tried to hook up the compressor again, but the "goo" had clogged the valve stem on the tire.

I call the flatbed tow truck (60 miles away), as we are headed back down the road riding in the front seat of the tow truck, I spot the culprit, a 6 inch triangular piece of asphalt sticking pointy side up in the road.

2 hours later we get to a tire store. We get a good look at the tire and find a big slit in the sidewall on the inside of the tire, with "goo" running out of it....so the emergency tire kit could not have worked on such a serious injury.

Hence my spare tire inquiry

 

A 245 tire on a front rim will work fine on the rear of the car for temporary purposes. Some of the Vantage GT4 cars actually use rear wheels on all four corners.

 

As long as the tire diameters are the same on the rear you should be OK. Front isn't as critical but because of limited slip diff tires must be same diameter.


For long drives I typically carry a small jack and a Safety Seal brand repair kit as they have heavy duty tools for the plugs and will repair most punctures as long as it's not a slash. Carry a pair of cutters and screw drives to pull nails and remove screws.

 

Get a narrower wheel and tire than OEM front. Will be easier to carry and will do the job. A 7" wheel with a 205 would be fine. Just get the right profile to match OEM diameter.

 

It wouldn't have helped a major sidewall slit ... but I do carry a $10 plug kit in the car and a set of pliers big enough to pull out a screw. You can typically plug a tire on the car, and its really isn't that bad a job. Get a kit with the reamer tool, the insertion tool, and a couple of plug strips. You will need a knife too to cut off the excess.