Spare tyres are a common sight on cars and trucks, but why are they not actually standard tyres? The main reason is that spare tyres are designed for use in cases of emergency. They're not meant to be driven on a regular basis, and as such, they don't last as long as regular tyres. Additionally, spare tyres are often heavier than regular tyres, which can cause problems when driving on the road.

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https://www.spotdem.com/2022/12/06/why-are-spare-tyres-not-actual-standard-tyres/