How much air should be added to the spare tire?

[StVera]

Spare tires should be inflated to 2.5 bar. Since spare tires are not frequently used, it's best to maintain a higher air pressure to prevent them from losing their emergency function due to insufficient pressure when needed. Effects of low tire pressure: Low tire pressure increases tire body deformation, making the sidewalls prone to cracking while generating flexing movements that lead to excessive heat buildup. This accelerates rubber aging, causes fatigue in the cord ply, and may break the cords. It also increases the tire's contact area with the ground, accelerating shoulder wear. Effects of high tire pressure: Excessive tire pressure overextends and deforms the tire cords, reducing the tire body's elasticity. This increases the load on the vehicle during driving, and impacts may cause internal cracks or blowouts. High pressure also accelerates tread wear and reduces puncture resistance.

[Tess]

Last time I changed to the spare tire, I almost got into trouble because the tire pressure was insufficient. That compact spare tire may look small, but it needs to be fully inflated to be effective. Typically, its pressure requirement is much higher than regular tires, usually around 60 psi (approximately 4.1 bar). The exact specification is printed either in your vehicle's manual or on the small label near the driver's side door frame—never guess the pressure. I remember I casually inflated mine to 40 psi that time, which resulted in a bumpy ride and accelerated tire wear. Luckily, I noticed it early. Since spare tires stored in the trunk gradually lose air over time, it's recommended to check the pressure every three months using a standard tire pressure gauge. When temporarily using a spare tire, never drive too fast—keep it under 80 km/h—and avoid long-distance travel for safety. The proper course of action is to visit a repair shop as soon as possible to switch back to a regular tire.

[Tyrone]

I'm not entirely clear on the details of spare tire pressurization, but I generally know it needs to be inflated slightly more than regular tires. There should be standard values listed either on the car door frame or in the manual, typically around 60 psi. Personally, I check the spare tire pressure whenever I refuel, using a household handheld tire pressure gauge. Just top it up when the pressure is low, but don't overinflate or underinflate it, as that could cause issues. When using the spare tire, drive more cautiously since it's meant for emergencies and prolonged use might be risky. Remember, don't overlook these small details—they can save you a lot of trouble.

[McLucas]

Insufficient spare tire pressure can be extremely dangerous. I've seen people stranded on the road due to low pressure, which is a huge inconvenience. The standard spare tire pressure is usually 60 psi, equivalent to approximately 4.1 bar, as indicated on the vehicle's label or manual. Make it a habit to check during every maintenance service using a tire pressure gauge, and promptly use an air pump to replenish if the pressure is low. Don't just focus on the main tires and neglect the spare tire. Also, pay attention to road conditions when using the spare tire temporarily to reduce accident risks. Develop a routine to address insufficient pressure early on.