How much should a spare tire with 420kpa be inflated to?
2 Answers
A spare tire with 420kpa should be inflated to 4.2bar, as spare tires are mostly stored in the trunk for long periods and may gradually lose pressure over time. Inflating to a higher pressure ensures that it maintains a usable pressure level in case of emergencies. Below is some extended information about tire pressure: 1. Tire pressure standards: Standard tires should be inflated to 2.4-2.5bar, reinforced tires to 2.8-2.9bar, with the maximum pressure not exceeding 3.5bar. 2. The role of tire pressure: Tire pressure is an indicator of a vehicle's load capacity, and the load capacity depends on the level of tire pressure. When a car is driving at a constant speed on a level road, it must overcome rolling resistance from the ground and air resistance. Tire pressure significantly affects the rolling resistance coefficient. Appropriately reducing tire pressure can improve ride comfort, but if the tire pressure is too low, it may affect other performance aspects of the vehicle.
Regarding spare tire pressure, I believe inflating it to 420 kPa is the optimal choice. Spare tires are typically compact in design and require higher pressure than regular tires to stably support the vehicle's weight, preventing wobbling or blowouts while driving. Personally, I check the spare tire pressure every three months because even if unused, air can slowly leak out, especially with significant temperature changes. After inflating to 420 kPa, I recommend tightening the valve cap to prevent accelerated air leakage. Spare tires are for temporary use, generally limited to speeds below 80 km/h, and should not be driven on for extended periods; otherwise, insufficient pressure can lead to rapid wear or instability. Safe travel depends on these small details, so I suggest checking the spare tire during every maintenance to ensure it's fully inflated. Remember, with the correct spare tire pressure, you can feel confident during temporary replacements.
