The sidewall height can be calculated by multiplying the ratio (70 or 0.70) by the width (225): 225 millimeters x 0.70 157.5 millimeters. This is the ratio of the sidewall height to the width. Use our tyre size calculator to find tyre diameter, width, sidewall, circumference, and revolutions per mile. Once youve found your tyre size, use our calculator to find the right size. A better easy to use tyre size calculator. While standard SAE tire sizes are easy to understand. We calculate this number by dividing the tyre’s section height by the tyre’s width. R means the tyre is a radial construction 14 is the rim diameter in inches. Need help with this calculator Check out the new comments section below Metric and Inch Tires Sizes. 18 indicates the Diameter of the wheel rim. Following the slash, the next number in the sequence is 50 This number is the tyre’s aspect ratio essentially the height of the tyre’s profile outward from the rim represented as a percentage of the tyre’s width. Tyre Age – The service life of a tyre is a cumulative function of the storage, rotation, and service conditions, which a tyre is subjected to throughout its life (load, speed, inflation pressure, road hazard injury, etc.). The number 70 is the aspect ratio, sometimes called the profile. Sidewall height of the tyre is of same size as that of width. When rainy season is due to start, it’s a good time to check if your tyres are still safe. If you notice uneven wear on the tyre – just one side, both sides, or just the middle – it’s time to change your tyres and get your alignment or inflation checked.Ĭlimate – Too much exposure to direct sunlight, UV rays, and/or heat, can cause cracking in your tyres. 65 indicates its aspect ratio, a comparison of the tyre’s section height with its section width (65 indicates the height is 65 of its width). 205 indicates the normal section width of the tyre in millimetres (205mm).
Tyre aspect ratio calculator code#
If they are flush with the level of the tread, then the tyre should be replaced. For example, the code on a common fitment for Australian cars is: 205/65R15 95H. Tread wear indicators, or wear bars, are spaced evenly through the main grooves in the tyre tread. Tyre Wear – All tyres wear out over time. The lifespan of a tyre depends on a combination of influences including: the driver’s driving habits, climate, road conditions, tyre design, and proper tyre maintenance.
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