What does 225/55r17 mean?
2 Answers
225 refers to the tire width of 225mm; 55 refers to the aspect ratio of the tire section being 55%, meaning the section height is 55% of the width; r17 indicates that the wheel diameter is 17 inches. Here is some related information: 1. Tire: A tire is a circular elastic rubber product assembled on various vehicles or machinery that rolls on the ground. It is usually mounted on a metal rim, supporting the vehicle body, cushioning external impacts, achieving contact with the road surface, and ensuring the vehicle's driving performance. 2. Wheel Hub: A wheel hub is the rotating part of the wheel steel inside the tire connected by pillars, which is the metal component mounted on the axle that supports the tire. It is also called a wheel rim, steel rim, or tire ring. Wheel hubs come in various types based on diameter, width, manufacturing method, and material.
I'm an old hand at the auto repair shop, working for over 20 years and dealing with tires every day. The numbers 225/55R17 are the markings for tire size: 225 stands for a width of 225 millimeters (mm)—the wider the tire, the better the grip and braking stability, but it also means higher fuel consumption; 55 is the aspect ratio, meaning the tire's height is 55% of its width—a higher number gives a smoother ride with less bumpiness, while a lower number offers better handling but a stiffer, bumpier ride; R stands for radial construction (radial tire), which is more durable and safer than the old bias-ply tires; and 17 is the rim diameter in inches—matching the right wheel is crucial. When replacing tires, always stick to the factory specifications—getting it wrong can lead to increased steering wheel vibration and a higher risk of skidding in wet conditions. I also recommend checking the tire pressure every season—too low and the tires wear out faster, too high and the risk of a blowout increases. Overall, this size is ideal for family SUVs or sedans, balancing safety and fuel efficiency is the way to go.
