The chart below doesn't list all possible tire sizes, but does list the most popular ones. The table below is based on rim sizes and tire cross-sections rather than than nominal sizes. It is less than 19 inches in effective diameter. For example, a 44-406 (20 x 1.5') tire is not really 20 inches in diameter. Tires which a national standard identifies by outside diameter actually vary depending on the tire cross section. Group Aĭifferent manufacturers have used different brands of tires to calibrate - or have done calculations based on nominal dimensions - so there can be a slight inconsistency between the numbers in the tables and the most accurate number for your bicycle. We have classified cyclecomputers into six groups according to the number used in calibrating them.
We have provided tables of tire sizes for this purpose. The simplest method is to set the wheel sensor for a nominal tire size.
