Is a 45 tire too thin?
2 Answers
Generally, tires with an aspect ratio below 45% are referred to as "thin tires." The aspect ratio is the ratio of the tire's thickness to its width in its natural state. For a wheel of a certain width, the lower the aspect ratio, the thinner the tire section. The thicker the tire, the more prone it is to distortion. Here are the functions of car tires: 1. Support the entire weight of the vehicle: Support the entire weight of the vehicle, bear the load of the car, and transmit forces and moments in other directions. 2. Transmit traction and braking torque: Transmit traction and braking torque to ensure good adhesion between the wheel and the road surface, thereby improving the car's power performance, braking performance, and passability; work together with the car's suspension to mitigate the impact received during driving and dampen the resulting vibrations. 3. Prevent damage to car components: Protect car components from severe vibrations and early damage, adapt to the vehicle's high-speed performance, reduce driving noise, and ensure driving safety, handling stability, comfort, and energy efficiency.
I'm the kind of person who enjoys driving with a bit of excitement. The '45' in tire sizing refers to the aspect ratio—the height of the tire's sidewall as a percentage of its width. For example, in a size like 225/45R18, the '45' means the sidewall height is 45% of the tire's width, making it a relatively low-profile tire.
These tires do offer sharper handling and more precise steering, making the car feel more responsive during cornering—perfect for those who love an engaging drive. But don't get carried away just by the thrill. These tires are highly sensitive to road conditions; potholes and rough surfaces will translate into a noticeably harsher ride, significantly compromising comfort. They also carry a slightly higher risk of punctures, as debris or sharp edges can more easily damage the thinner sidewalls.
From my experience, if you frequently drive on highways or race tracks, 45-series tires can deliver the excitement you crave. However, if your routes often include rough roads or you prioritize passenger comfort (especially for family), opting for thicker tires with 55 or 60 aspect ratios is the wiser choice. Bottom line: don’t just chase the cool looks—match your tires to your driving habits, and always put safety first.
