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Cycling Glossary - Word of the Day
gear ratio –
This is used to compare gearing. For example, on a road bike with 18 gears, there are 2 chainrings and 9 cogs. To check the gearing, count the teeth on the cogs and chainrings and create a chart with the rings on top and the cogs on the side. Then, to calculate each gear ratio, divide the chainring by the cog and multiply by 27 (rear wheel diameter). Put the numbers in the chart so you can compare and understand. The larger the number, the harder it is to pedal the gear. By comparing the numbers, it's possible to find overlapping gears and gaps that you might want to change to improve the gear ratios.