Share this site! By AAA Automotive. Search More Facilities. Myth: You can drive normally on a smaller-sized spare tire. Replacing the differential is a lot more expensive than replacing a tire. Trust us. Get the tire repaired as soon as possible, and don't push your luck. It should say right on the side of the spare tire, or on the wheel itself on a large, prominent sticker. If that's missing or illegible, the rule of thumb is to not drive faster than 50 mph with a donut spare tire.
Going faster could cause tire failure, differential damage, or both. Try to avoid the freeway if possible. And get to a tire repair facility as soon as possible. You may notice poor cornering, handling, and braking characteristics. The donut spare has a smaller footprint than a conventional tire, which translates into diminished braking, roadholding and handling. With the donut spare in place, you may find that, when braking, the vehicle dips to the side where the donut was mounted.
Also, you may notice the vehicle pulling to that side. The use of donut spares is the result of limited space inside the vehicle in question or car makers seeking to reduce cost or weight. Typically the donut spare takes up much less space and is cheaper to manufacture than full size tires and wheels, which translates into more profit for the car makers.
It also is significantly lighter than a full-size tire and wheel, which helps with fuel economy. Many cars eliminate spare tires of any sort altogether, and instead include a small tire inflator or can of tire goop, in the name of further weight savings and greater efficiency. Outfitting the car with run-flat tires is another frequent choice. These allow your to drive a comparable distance as the temporary spare would allow even with a full loss of air. The catch is they are much pricier to replace.
For the consumer, anything less than a full-size spare is quite a compromise in the event of a puncture. Yes, but the question is: where do you carry and stow it? Years ago, cars had spare tire wells to fit the full size spare so that it was out of the way. This space has been eliminated in order to save weight and space. It looks like we're stuck with donut spares, or no spares at all.
We get it. Driving on a smaller tire is bad for so many aspects of the vehicle. It can damage the vehicle for one thing, but it can also throw you off as a driver. With that being said, the car is not in a good position and you are not going to be able to have perfect control over it…you can see why driving fast could lead to a bad outcome. Driving over 50 is going to reduce the lifespan of the tire even more than it already is. Most donuts are designed to take you a total distance of about miles.
If you are driving fast, over 50 miles per hour, for example, you will cut that lifespan down to about 50 miles or maybe even less. This goes back to the earlier part of the article. If it is a full-size spare than driving 70 mph is no problem, so long as that is the speed limit. If your spare tire is a donut, then you absolutely should not drive 70 mph. Donuts are relatively safe for temporary use but at that speed, they are not. If you are on a full-size spare then you have no reason to stay away from the highway.
You may drive the same way you do with your regular tires. If you are on a donut, you should stay away from the freeway. Some people are unable to stay away from the freeway, which is understandable. If that is the case, you will want to explore alternative routes throughout the duration of your donut experience.
If you absolutely need to use the freeway, then you ought to get a new tire as soon as you possibly can. The more time you spend on the freeway, the more dangerous it is for you and the more harmful it is to your car. When driving on the highway, stick to the right lane and use your emergency lights to indicate that you are driving more slowly than other vehicles.
Well, yes you can but only if you are not driving much. If you are only to be driving a minimal amount during the particular week where you have a donut, then that should be no problem. However, if you drive 30 miles to and from work every day, no you cannot drive on a donut for a week. There are several reasons why you do not want to put that smaller spare tire on the front of the car. For one thing, plenty of cars are heavier in the front than they are in the rear. You do not want the donut to be supporting the larger proportion of the weight of the vehicle.
Since the donut is smaller, putting it in the front is going to impact two things pretty dramatically: braking and handling. Most of the time, the front tires are doing most of the work in terms of braking. It makes sense, what happens to the car when you slam on the brakes? It leans forward. Plus, braking relies heavily on the surface area of the tires.
Donuts have about half the surface area as regular tires. With the handling, the smaller wheel is going to mean that one tire is turning more sharply than the other. This is going to make things pretty awkward in terms of maneuvering your vehicle. Also, the alignment will no longer be lined up and so the car will veer on its own.
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