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Why Can't a Car Spare Tire Be Used for a Long Time?

3 Answers

Jeremy

07/29/25 11:55pm

Car spare tires cannot be used for a long time mainly because prolonged disuse causes them to age due to external factors such as temperature and humidity, leading to a significant decline in their safety performance. Car spare tires are actually divided into two types: 1. Full-size spare tire. The manufacturing process of this full-size spare tire is completely identical to the other tires of the car, meaning it can be used as a normal tire. 2. Non-full-size spare tire. This type of spare tire is essentially not made to be the same as a normal tire, which is evident from its appearance. The reason it is called a spare tire is not just a name but also due to its manufacturing process.

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MayaRose

08/16/25 3:32am

I'm an auto mechanic, and I've seen too many people suffer big losses from using spare tires as regular tires. The rubber compound of a spare tire is about 30% softer than a normal tire, and the tread thickness is only 60% of a standard tire. Manufacturers clearly mark them with a speed limit of 80km/h. Once, a car owner didn't replace it for two months, and the sidewall tore apart on the highway—luckily, nothing serious happened. Not to mention, many cars now come with spare tires that are a size smaller, making them completely incompatible with the tire pressure monitoring system. I always keep tire repair plugs in my toolbox, just in case customers take the easy way out and use the spare tire long-term.

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GabrielleLynn

10/19/25 4:52am

Last time when I was taking my daughter to school, I found the tire was flat. The mechanic who helped me change to the spare tire specifically warned me not to drive more than 50 kilometers with it. This smaller-sized spare tire simply can't support the car's weight properly—I could feel it was much thinner than a regular tire just by touching it. The mechanic said long-term use could wear out the suspension parts, and repairs could cost thousands, which scared me so much that I went to replace the tire the very next day. Plus, the spare tire has shallow treads, making it prone to skidding when driving fast in the rain. Last week, my neighbor Aunt Wang scraped the curb just because of that.

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What Causes Normal Low Pressure but Low High Pressure in Car Air Conditioning?

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Do You Need to Press the Accelerator When Using Paddle Shifters?

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