What is the difference between a spare tire and a regular tire?

1 Answers
Clinton
07/29/25 12:10pm
The difference between a spare tire and a regular tire lies in the air pressure: the suitable air pressure for a spare tire is between 2.3 to 2.5 bar; the air pressure for a standard regular tire is between 2.4 to 2.5 bar, while for reinforced tires, it ranges from 2.8 to 2.9 bar, with the maximum pressure not exceeding 3.5 bar. Most car manufacturers produce spare tires that are slightly smaller in size compared to regular tires, as this helps reduce production costs. Spare tires are stored in the trunk for long periods, leading to significant rubber aging, which can cause skidding during sudden braking due to varying wear levels. The principle for replacing tires is that tires on the same axle must be of the same brand, tread pattern, size, load index, speed rating, and have similar tread depth, all for the sake of safe driving.
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