What is the tire size for BMW 745?
2 Answers
BMW 745's front tire size is 245/40R20, and the rear tire size is 275/35R20. Daily tire pressure checks for tire maintenance: Tire pressure should not be too high or too low. Excessive tire pressure may lead to the risk of a blowout due to inability to withstand excessive expansion pressure during high-speed operation, while insufficient tire pressure can cause excessive tire flexing due to uneven road surfaces during driving, keeping the tires in a prolonged state of fatigue and accelerating tire aging. Regular tire rotation: This ensures even wear across all four tires and provides better friction between the front tires (steering drive wheels) and the road surface, preventing front tire slippage and ensuring driving safety.
I often come into contact with high-end cars, and the BMW 745 typically has front tires sized 245/45 R18 and rear tires sized 275/40 R18. In this size, 245 represents the tire width of 245 millimeters, 45 is the aspect ratio, meaning the tire height is 45% of the width, and R18 indicates an 18-inch wheel diameter. The narrower front tires help with steering responsiveness, while the wider rear tires enhance traction and stability—BMW designed this to balance driving pleasure and safety. If you need to replace the tires, it's recommended to use the original factory specifications. Avoid arbitrarily increasing the wheel size to R19 or above, as this may interfere with the suspension system or increase fuel consumption. Regularly check the tire pressure to maintain the recommended values, and replace the tires promptly if they are worn beyond the limit. Don't try to save money by buying used tires, as this could compromise driving safety.
