1
Derailleur,
rear
Device that moves the chain between the cogs of the cassette,
changing the gear ratio of the drivetrain.
2
Cassette
The set of toothed rings or cogs that make up the gears attached
to the rear wheel - usually 7, 8 or 9 cogs of different sizes make
up the cassette.
3
Swingarm
On full suspension bikes, the mechanism where the rear wheel is
attached which moves as the rear suspension is activated. Usually
made up of the chainstays and seatstays of the bicycle.
Only found on full suspension bikes.
4 Derailleur,
front
Device that moves the chain between the chainrings, making larger
gear ratio changes of the drivetrain when compared to the rear
derailleur.
5 Chainstays
Frame tubes that connects the bottom bracket to the rear dropouts,
where the rear wheel is attached. Run the same path as the chain,
thus the name.
6 Bottom
bracket
Can refer to either the short threaded tube that runs
perpendicular to the rest of the frame tubes where the cranks
attach, or the actual set of spindle and bearings that threads
into the frame.
7
Chainrings
1: The set of toothed rings (usually three) that are bolted to the
right crankarm. 2: An integral part of the drivetrain, as the
chainrings move the chain.
8 Crank
The two-armed mechanism that connects the pedals to the front
chainring.
9 Pedals,
clipless
Similar to ski bindings, clipless pedals contain a mechanism which
attaches to a cleat in the bottom of dedicated cycling shoes.
Creates an efficient pedaling motion that allows the rider to pull
up as well as push down on the pedals.
9
Pedals, platform
Simple two-sided flat pedals that work well with standard
footwear.
10
Frame
The heart of the bicycle — all parts of the bicycle are attached
to the frame.
11 Down
tube
Frame tube which connects the bottom bracket and the headtube.
12 Headset
The headset is the pair of bearings and bearing races (races are
things that bearings sit in) at each end of the head tube that
allow the fork to steer the bicycle smoothly.
13 Head
tube
1: Forward-most tube of the frame, which runs perpendicular to the
ground. 2: Connects the front stem to the fork in combination with
the headset.
14
Fork
Attaches the steering system (handlebars and stem), to the front
wheel.
On mountain bikes a suspension fork is usually found here.
15
Dropouts
The hook-shaped pieces of the frame which contact the hub of the
front and rear wheels. The dropouts attach the wheels to the bike.
Disc brakes
Similar to a motorcycle, a braking system that has a dedicated
disc for the braking surface. Can substantially improve the
braking modulation and control over traditional brakes.
Drivetrain
The system that transfers pedaling power to the rear wheel.
Includes the cranks, chainrings, bottom bracket, chain,
derailleurs, and cassette.
