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No spare, no run flat, no running on 3 wheels. Just a can of goo!

As delivery time approaches I worry about the lack of a full sized spare and a place to put it (since it can't fit in the frunk); or, even a doughnut that could fit in the frunk. The car with air suspension can't crawl to the nearest repair center on 3 wheels. I really don't like or want run flats, so that's not upsetting to me; but, relying on a can of tire sealant is extremely worrisome. What does that goo do to the tire, wheel and pressure monitoring system (I assume the Model S has one)? In case of a blow out does Tesla just want us to deal with the night stalkers until an approved tow truck arrives?

I think Ron and Barbara explained Jack Mode: It freezes the air suspension to avoid automatic leveling, which it would normally do. When fixed on a tow track, automatic leveling could work against the equipment that holds the car in place, potentially becoming loose or damaging the car. If have yet to hear about lift-a-leg (TM) functionality in the Model S, the "Jack Mode" it is not.

As mentioned earlier in this thread, an in-depth discussion of this topic, including the role of air suspension in this context, can be found here:

I've used fix-a-flat in tires many times and the shop was able to repair them afterward with no problem. If tire shop guys are telling you they can't repair a tire after it's had fix-a-flat in it, they're either misinformed or trying to get you to buy a new tire unnecessarily.

tesla.mrspaghet-I like your response. AlexK mentioned that earlier in this thread with the use of the Slime product. Does it make a difference which brand of fix-a-flat is used? I still worry about messing up the tire pressure monitoring system.

I noticed that there is a Model S tire repair kit offered in the Tesla Shop. Does anyone know what it is or does?

It looks like a compressor to inflate your tires and it obviously plugs into the 12 volt outlet of your car.

Yes, it is clearly a compressor that plugs into the 12v outlet.

However, it is called a "Tire Repair Kit, so perhaps it also includes a Tesla-approved can of Fix-a-flat? If it is just a compressor, it should probably be called a "Tire Inflator Kit".

I realize that a spare would increase weight and decrease range but shouldn't Tesla at least offer a doughnut spare (TESLA ARE YOU LISTENING!) and a place to securely stow it for those of us willing to pay. I don't have range anxiety but I do have blow out HIGH anxiety. I'll take the can of fix a flat too with a compressor for the nail or the screw as long as it doesn't mess up the wheel and pressure monitoring system.
Spoke to some friends who have performance tires and they felt that because of the softer "rubber" there cars were susceptible to more flats. True or not?

I have a question: Does the 21" wheel & tire have the same circumference as the 19" wheel & tire?


Yes, same diameter/circumference but the 21" is a a little wider.

The circumference has to be the same, or the speedometer, odometer, gearing, and so on all have to be adjusted. The walls of the tires are exactly as much shorter as the rims are wider. So to speak.

Question: Since both the 21" and the 19" have the same circumference, which would be weigh less if I wanted to carry one on long distance trips as a spare?

The 19". The 21" wheel has more metal because both the rim diameter and width are wider.

I'm not so sure about that. Aluminum rims are light, rubber is surprisingly heavy and you reduce twice the amount of rubber compared to added aluminum when you go from 19 to 21. My bet would have been other way around. Whatever the reality, difference is not very big.

I can state for a fact that 18" rims are noticeably heavier than 18" rubber tires. As the size increases, I'd be willing to bet the rims are still gonna be heavier.

Heavier than tires alone, of course, but you don't add whole rim in this size increase, only two inches of rim poles, and remove two inches of tire twice (two inches from both walls of the tire).

hmm...add a bit circumference increase to tire base to that rim...about 9.5 inches. That's a bit more than I thought it would be. Lesson to learn, always calculate before using intuition. 9.5 inch long block of aluminum in tire that is as wide as Model S tires are is not a small piece.

The middle of the pie always has more meat to it than the crust ;)

Ok, for a spare, carry a 19" wheel & tire, a small bottle jack,and the proper socket size in the trunk. For long distance trips away from home.

I've asked about this. You can get a 5th 19" wheel for a spare at $275+cost of a new tire.

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