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Not all tires are created equal, and most of the details that make the difference are summarized on the sidewall. Here's how to read a tire. Tire sizes and ratings: What do letters and numbers mean?
Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. [24] From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.
Modern road tires have several measurements associated with their size as specified by tire codes like 225/70R14. The first number in the code (e.g., "225") represents the nominal tire width in millimeters. This is followed by the aspect ratio (e.g.,"70"), which is the height of the sidewall expressed as a percentage of the nominal tire width.
A typical example of a tire marking according to ISO 5775-1 is: 32-597 inflate to 400 kPa. The first number (nominal section width) is essentially the width of the inflated tire (minus any tread). The second number (nominal rim diameter) is the inner diameter of the tire when it is mounted on the rim.
The number following the "plus" describes the number of inches which is added to the diameter of the rim. For example, plus one sizing means increasing the wheel by 1 inch (25 mm) – i.e. from a 15 to 16 in (380 to 410 mm) rim size. A "plus zero" upgrade means changing to a wider tire size while using the same diameter wheel.
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ETRTO sizes apply to rims and tyres for vehicles of all types, including bicycles. The great advantage of ETRTO sizing is that it is unambiguous; previously, nominal dimensions were used which were interpreted in different ways by different countries and manufacturers - a problem for the end user.
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