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They are generally measured by the number of teeth.
A sprocket is a toothed wheel whose teeth engage the links of a chain.
The chain is size 530, and the stock gearing is 15/45, meaning that the front sprocket has 15 teeth and the rear sprocket has 45 teeth.
Sprocket and chain and what?
They came stock with a 49T or 48T rear sprocket you can choose a replacement with either a 48T, 49T, 50T, or 51T, if you have the old sprocket count the teeth on the sprocket and that tells if it is a 48T, 49T or whatever (48T = 48 teeth)
The front sprocket has 14 teeth. the rear has 41 teeth, but on mine i have 13 front and 42 rear its more bottom end performance
The chainring by the pedals and the sprocket(s) by the rear wheel.
A rough comparison of the gearing can be had by dividing the teeth on the chainring with the teeth on the sprocket.
25t means that there is 25 of the little spikey teeth on the outside of the sprocket :]
yes but it will be really easy to pedal
The more teeth you have on the chainring(by the pedals) when compared to the sprocket(on the rear wheel, the more the rear wheel will turn for each turn of the cranks.
40