Modern standards can take time to be adopted by an industry. This article aims to explain what development meters are, how they're calculated, and when they should be used.

### What are development meters?

Development meters is the distance in metres the bicycle travels with each pedal stroke.

### How are development meters calculated?

This system is a bit more cumbersome to calculate than the gear inch system due to having to use an irrational constant. It's measured in metres and can be calculated by multiplying the circumference of the driven wheel by the gear ratio.

Development meters can be calculated from the following formula, where TT stands for tyre thickness, RD for rim diameter, and GR for gear ratio.

(TT × 2 + RD) × pi × GR

### Where can measurements be found?

The thickness of the tyre is measured across the tread, and the diameter of the rim is measured up to the rim bead. Both are measured in millimeters. A marking can also be found printed on the sidewalls of the tyre. To learn more about tyre sizes, please visit our articles covering the individual sizing systems.

### When should development meters be used?

Development meters are most commonly used in countries that have adopted the metric system. It's useful when the wheel sizes differ, however it's less effective when the crank arms are of different lengths. It's recommended to use development meters prior to changing the tyre width or rim diameter.

### Which other gearing systems exist? 