Tire Width: The first number in the tire size (like 245/40R18) represents the tire’s width in millimeters. Aspect Ratio: The second number (40, in this example) is the aspect ratio. This percentage indicates the height of the tire’s sidewall relative to its width.Tire Width, Tire To Rim, Rim Diameter – This is written like 4. So this wheel is 4. Notice that the size of this tire never specifies the diameter of the entire tire.So your tire size means that the outside to outside widest width of your tire is 4.
What is the 3% rule for tires?
The 3% rule states that when replacing tires, the new tire’s diameter should not differ from the original by more than 3%. This guideline helps maintain proper vehicle performance, safety system functionality, and speedometer accuracy. The 105% rule says that the external rim width of your wheel should be at least 105% of your tire’s actual measured width. This ratio allows the airflow to remain attached as it moves from the tire onto the rim, reducing drag and making your bike more aerodynamic.The 3% rule states that when replacing tires, the new tire’s diameter should not differ from the original by more than 3%. This guideline helps maintain proper vehicle performance, safety system functionality, and speedometer accuracy.It is advisable to have your tyre replaced once it reaches 2mm and the minimum tread depth commonly advised by tyre and safety experts is 3mm. Waiting until the last minute to replace your tyre can prove risky as a significant amount of tread can be worn in just one emergency manoeuvre. How long will 4mm tyre tread last? A tyre with 4mm of tread can last for around 10,000-20,000 miles. This is not a guarantee however, so make sure to check your tyres regularly. The rate at which they wear down will vary depending on the tyres you have fitted and the factors listed before.Tire Width, Tire To Rim, Rim Diameter – This is written like 4. So this wheel is 4. What this means is that you have a tire which is 4.
What is the most common 4×4 tyre size?
The most popular 4×4/SUV tyre size remains 235/60 R18, which occupies 7 per cent of the segment. The Honda Activa 4G tyre size is 90/100-10.