Inch Usage

In many other European languages, the word for "inch" is the same as or derived from the word for "thumb", as a man's thumb is about an inch wide. The inch is a commonly used customary unit of length in the United States, Canada, and the United Kingdom. It is also used in Japan for electronic parts, especially display screens. Inches are commonly used to specify the diameter of vehicle wheel rims, and the corresponding inner diameter of tyres – the last number in a Car/Truck tire size such as 235/75 R16.