What is the recommended tire pressure for 650 tires?
2 Answers
Truck 650 steel-belted tires normally require 7 bars of pressure in winter and 6.5 bars in summer. Locating standard tire pressure information: You can refer to the vehicle's user manual or the label near the door (B-pillar or C-pillar area), where the manufacturer's recommended value (cold tire pressure) is indicated. Generally, recommended tire pressure varies by vehicle type—passenger car and SUV tire pressures differ, for example. Therefore, to determine the appropriate tire pressure for a passenger car, checking the manufacturer's recommendation provides clear guidance. Tire pressure considerations: Tire pressure fluctuates with temperature changes. In high-temperature conditions or during summer, it is advisable to reduce tire pressure by 0.1 to 0.2 bar. Conversely, in extremely low temperatures, such as winter, increasing tire pressure by 0.1 to 0.2 bar is recommended.
I've been using 650 tires on my truck, with a personal preference of inflating them to 7.0 to 7.5 bars. The exact value depends on how much weight you're carrying. When fully loaded, I inflate to around 7.5 bars to prevent tire deformation; when running empty, I reduce it to 7.0. In winter, I add 0.3 bars to compensate for cold contraction, and in summer at noon, I reduce it by 0.2 bars to account for thermal expansion. I check the pressure twice a month with a mechanical gauge, mainly to see if the tread wear is even—if the edges wear out too quickly, it means the pressure is insufficient. Additionally, older tires require an extra 0.5 bars of pressure, especially those that have been used for three years, to avoid bulging issues on the road.
