275 vacuum tire 2.3-2.5 air pressure, under normal circumstances, the cold state of the front tire pressure is 2.2-2.3, and then the tire pressure is 2.4-2.5 is within the normal range, but there are also front tires of 2.4-2.5, rear tires of 2.2-2.3, which can be specified according to the tire pressure marked by the vehicle. Make sure the tire pressure is not too high or too low.