![]() ![]() You should be able to tell how far apart the marks are (or between multiple spots for even greater accuracy).Your tire should leave a mark on the pavement every time it touches it.On the pavement, splatter a glob of wet paint or water.In mm, calculate the distance between the two markings.Make a chalk tape mark at that location.Return the valve stem to the bottom of the wheel by rolling the wheel forward one revolution.Make a chalk tape mark on that place with a friend.Roll ahead till your valve stem reaches the wheel’s bottom.Here are two ideas on how to go about it: Wall roll Source: You can measure the tire circumference of your bicycle tire by using the following methods Rollout TestĪ common method used in determining your wheel size that does not require any mathematics is to measure the distance you go in one revolution of the tire while inflating the pressure you regularly use. Please note that the tire size is indicated on the side, most of the times. Use the chart below as reference for tire circumference. (28 1 12 and 28 1.50 are not the exact sizes.) Cateye Tire Size Chart: Circumference Reference Inch-based labels show the width in a decimal (26 1.75) or as a fraction (26 1 34), and although these size identifications can be mathematically equal, they can also refer to different size tires that are not interchangeable. However, the ISO standard notation uses the diameter of the wheel bead seat in millimeters, followed by the inflated tire width in millimeters.Īlthough these size identifications can be mathematically equal, they can also refer to different size tires that are not interchangeable. Traditional size schemes use the inflated tire’s outer diameter (measured in inches or millimeters). A uniform method was required as cycling became increasingly worldwide. The exact size of the bike tire might be found with different numerals in various countries. Initially, there were a variety of measurement techniques, with each nation that produced bicycles having its marking system. Cateye tire size Cateye Tire Size Chart: Measurements ![]()
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