It has two front chainrings and ten cogs in the rear. A ‘2x10’ system is pronounced ‘two by ten’. The numbers are typically separated by an ‘x’. In this case, the chain is wrapped around the big 53 up front, and the little 11 out back. This is referring to a specific gear selection. If it was a triple system, there would be a third number (for example, a 52/39/30 triple). This does tell us how many rings are on the crank. The big ring has 53 teeth, and the small ring has 39.
This refers to a pair of front chainrings. To know how many cogs are in that cassette, we simply say, ‘9-speed’, ’10-speed’, and so on. It just tells us what the extreme ends are. This does not tell us anything about the number of cogs in the cassette (it could be a two speed cassette… or a twenty speed). The smallest cog has 11 teeth, and the biggest cog has 25. Before we begin, let’s take a quick look at how we talk about gearing with a few examples.
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