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Tyre Town - Tire Size - Advanced (How To calculate your tire size)
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Home»Tire Info»Tire Size - Advanced
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Click for a printer friendly page to record your 4x4, Car or Van tire size.
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How To calculate your tire size (diameter or height)
(Or use our online Tire Size Calculator)
Click for answers in millimetres or answers in inches.
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Answers in millimetres Back to top
(Width x Profile/100 x 2) + (rim size x 25.4) = height
Width is in millimetres, Profile is a 2 digit number, Rims size is in inches, Height is in millimetres.
Using 205/65-15 as an example;
(205 x 65/100 x 2) + (15 x 25.4) = 647.5 mm
Some Van tires will have different markings, for example 185R14.
In this case substitute the 'R' for a 82 Profile
(185 x 82/100 x 2) + ( 14 x 25.4) = 659 mm
Some 4x4 tires will have different markings, for example 31/10.5-15.
In this case all dimensions are in inches ( " );
Height is approximately 31" or 787 mm (31 x 25.4 = 787.4 mm),
Width is approximately 10.5" or 267 mm (10.5 x 25.4 = 266.7 mm),
Rim size is 15".
For a rough rule of thumb for these tyres, work out the Height or Width in mm and subtract 10 mm, this will be close to the real life Height or Width.
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Answers in inches Back to top
(Width x Profile/2540 x 2) + (rim size) = height
Width is in millimetres, Profile is a 2 digit number, Rims size is in inches, Height is in inches.
Using 205/65-15 as an example;
(205 x 65/2540 x 2) + (15) = 25.49 inches
Some Van tires will have different markings, for example 185R14.
In this case substitute the 'R' for a 82 Profile
(185 x 82/2540 x 2) + (14) = 25.94 inches
Some 4x4 tires will have different markings, for example 31/10.5-15.
In this case all dimensions are in inches ( " );
Height is approximately 31",
Width is approximately 10.5",
Rim size is 15".
For a rough rule of thumb for these tyres, take the Height or Width and subtract 1/2 inch, this will be close to the real life Height or Width.
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