How many kilometers can a car's non-full-size spare tire run?

[StAdam]

A car's non-full-size spare tire can run no more than about 100 kilometers. The non-full-size spare tire is an emergency tire, as its speed rating and load index differ from the vehicle's four regular tires and cannot be used as a replacement. The spare tire is only for temporary use and should not exceed a speed of 80 km/h. Disadvantages of non-full-size spare tires: 1. They affect the vehicle's driving stability. Since the diameter and width of non-full-size spare tires are smaller than the original tires, the car body will not be level after installation. Additionally, the support force in all directions of non-full-size spare tires is inferior to the original tires, making driving stability a concern; 2. They can damage the car's transmission system. When a driven wheel is replaced with a non-full-size spare tire, especially if one of the drive wheels is replaced, it can easily damage the differential.

[SanFelix]

I've been driving for almost 20 years and frequently use that compact spare tire. To put it bluntly, it's not a proper tire - smaller in size and made of inferior materials, designed solely for emergency rescue situations. Generally, it can run for a maximum of 80 kilometers, but based on my experience, anything beyond 50 kilometers becomes risky because rough roads or higher speeds accelerate wear and may even cause a blowout. Remember not to exceed 80 km/h, otherwise handling becomes unstable and you might lose control when turning. I once used it on the highway and only dared to drive 60 kilometers before quickly exiting to get the car repaired. The key is not to be lazy - spare tires left in the car for too long can also age and leak air, so I check the tire pressure every six months to keep it normal. In short, safety comes first - don't cut corners by driving recklessly. Find a shop to replace it with a normal tire as soon as possible. Spare tires only last a few years, so replace them when due to avoid accidents.

[LaLillian]

Last year, I had a flat tire and had to switch to a non-full-size spare tire to solve the problem. It could only run a very short distance, about 50 to 80 kilometers. I drove 65 kilometers in the city and felt something was wrong—the wheel became soft and the noise increased. Later, I asked a mechanic friend and learned that this spare tire is only for temporary emergency use and cannot be used as a main tire. The different size causes uneven wear and power distribution issues. It's prone to damage if driven too far or with heavy loads, so it's recommended to keep it within 50 kilometers for safety. The speed should also be slow, with an upper limit of 80 km/h. Since then, I've developed a habit of checking the spare tire's condition before every long trip to avoid last-minute failures. After using it, I immediately go to the shop to fix the main tire and don't delay, as it could affect driving.

[GeorgeAnn]

The spare tire is only suitable for short-distance emergencies. It has a limited range, approximately within 80 kilometers. Its simple structure is not wear-resistant, and speeds should be kept below 80 km/h for safety. Insufficient pressure can reduce its lifespan. Replace the main tire as soon as possible.