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The golden rule with bicycle chainrings: a large chainring means more top end speed, whereas a smaller chainring helps when the going gets tough.
Chainrings differ for road and mountain bikes. Road bike chainrings are large, varying from 34-53 teeth. Mountain bike chainrings are much smaller, usually 32 teeth.
Bike chainrings come in a wide variety of sizes. Be sure to select the right size as well as the right bolt circle diameter (BCD) – a figure which helps you match a chainring to a crankset.