What does 195 65r15 mean on a tire?
Let’s take a common tyre size as an example: 195 65 R15 91 V: 195 – this is the width of the tyre in millimetres. This is also known as the aspect ratio. The lower the number, the more ‘low-profile’ the tyre. These numbers show the aspect ratio, which is the tire sidewall height in percentage to width of the tire. The width of Sidewall is directly proportional to the aspect ratio, a 70 aspect ratio means the sidewall height is 70% of 265mm while 65 aspect ratio means it is 65% of 265mm.In this case, the aspect ratio is 80, meaning that the height of the sidewall is 80% of the tire’s width. Tyre type and wheel diameter R13: The R stands for Radial, indicating that the tire has a radial construction.
What is the 7 7 rule for tires?
So, when is the right time to swap? The rule of thumb is 7-for-7: wait until there are seven consistent days at 7 degrees Celsius. The reverse is also true for transitioning to winter. Ottawa’s CAA Members can avoid the tire swap lineups at on-site vendors and save money with our economical Mobile Tire Change. The 7 7 rule for tires provides a simple temperature guideline for timing your seasonal tire changes. Install winter tires when daily temperatures drop to 7°C (45°F) or below for seven consecutive days. Remove them in spring after seven straight days above 7°C.
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. Can I fit a different size than the approved ones? It is imperative to respect the sizes approved by the manufacturer. In some countries, an exemption is possible provided that the tyre diameter remains within a limit of no more than -2% and +1.The 3% tire rule is a guideline for upsizing tires. It recommends keeping the new tire’s diameter within 3% of the original to avoid affecting performance and safety.Installing larger wheels and tires, also known as “plus-sizing,” can affect the accuracy of its speedometer and odometer, handling, steering response and more. If done incorrectly, changing the tire size can be detrimental to the safety of your vehicle.