A large toothed ring (part of the chainset) that drives the chain via the pedals and cranks.
The two horizontal parts of the bike frame that join the bottom bracket to the rear wheel.
A less commonly used term for a sprocket.
The arms which drive the chainwheels. Cranks are bolted to the crankshaft.
The axle to which the cranks are attached.
The mechanism which moves the chain from one chainring or sprocket to another.
The mechanism on a bike that changes its rate of motion; low gears make it harder to pedal while high gears make it easier.
The part of the bicycle which the rider takes hold of.
The seat of a bicycle.
A part of a bicycle which absorbs the impact of a wheel going over an obstacle, making for a smoother ride.
The rear cog, normally a smaller toothed ring, which fits onto the rear wheel; also called a cog or cogwheel.
The setup comprising the chainwheels, chain and rear sprocket.