Why is the tire pressure of a non-full-size spare tire 420?

[SanBrantley]

The reason why the tire pressure of a non-full-size spare tire is set at 420 kPa is that manufacturers take into account the need for it to coordinate with other tires after installation, hence the higher tire pressure requirement is quite normal. Below is some relevant information about car spare tires: 1. Definition: A spare tire refers to the backup tire for a car, and its specifications are usually the same as those of the original car tires. However, some vehicles use spare tires with special-colored rims, compact spares, foldable spares, or run-flat tires, etc., to remind the owner to inspect and replace the faulty tire promptly. 2. Types of spare tires: Spare tires are mainly divided into full-size spares, non-full-size spares, and run-flat tires. Run-flat tires, also known as safety tires or commonly referred to as "anti-burst tires," unlike ordinary tires, do not leak air or leak very slowly when punctured. They can maintain their driving profile, and the tire bead can remain fixed on the rim, ensuring that the car can continue to drive to a service station either for a long distance or temporarily.