Bicycle parts and components

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Perfect Parts Powering Your Success

Bike maintenance can be deceptively complex, and it's often better – and easier – to leave it to the pros.

List of bicycle parts

Axle: a rod that attaches a wheel to a bicycle and provides support for the bearings on which the wheel rotates, as defined in the generic definition. Also used to describe suspension components, such as a swing arm pivot axle.

Extensions at the ends of straight handlebars that allow for multiple hand positions are known as bar ends.

End caps or bar plugs are plugs for the ends of handlebars.

Cargo carrier: a basket

Bearing: a device that makes rotation easier by reducing friction.

A bell is an audible device used to warn pedestrians and other cyclists.

Belt-drive is a chain-drive alternative.

Brake cable for a bicycle: see Cable

A bottle cage is a water bottle holder.

Bottom bracket: The bearing system around which the pedals (and cranks) rotate. It consists of a spindle to which the crankset is attached as well as the bearings themselves. The spindle and each of the cups that thread into the frame have a bearing surface. The bottom bracket can be overhaulable (adjustable) or it can't be overhauled at all (a cartridge bottom bracket). The bottom bracket is housed within the bottom bracket shell, which is a component of the bicycle frame.

A brake is a device that is used to stop or slow down a bicycle. Brake levers mounted on the handlebars are used to operate rim and disc brakes. Band brakes are an alternative to rim brakes, but they can only be used on the rear wheel.Backward pedaling is used to operate coaster brakes.

A brake lever is a lever used to activate a bicycle brake.

Brake shifter, also known as a brifter (also see Shimano Total Integration, Campagnolo ErgoPower, and SRAM Double Tap): control of both the shifter and the brake lever

Braze-on: a fitting that protrudes from a frame to provide attachment, usually for cable housings, tire pumps, and other similar accessories.

A cable guide is a fitting that sits beneath the bottom bracket and guides a piece of bare inner bowden cable around a corner.

A cable is a metal cable that is partially enclosed by a metal and plastic housing and is used to connect a control, such as a brake or shifting lever, to the device that it activates.

Cartridge bearing: a type of bearing that cannot be serviced and must be replaced as a whole.

Cassette: a group of stacked sprockets on a bicycle's rear wheel with a rear derailleur.

Backpedal brake or coaster brake

Chain: an interconnected system of pins, plates, and rollers that transmits power from the front sprocket(s) to the rear sprocket(s) (s)

Chainguard: Gear case cover for the entire chain, either completely encasing (occasionally containing oil) or 'incomplete'. In either case, it is intended to keep clothing from fouling the chain. Skirtguard and Bashguard are also options.

Chainring: a front gear (or gears) attached to a crank.

see chainset Crankset

A chainstay is a pair of tubes that run from the bottom bracket to the rear fork ends of a bicycle frame.

A chain tensioner is a device that keeps the chain tensioned properly.

Chaintug: a device that assists in determining the proper chain tension.

A cluster is a bicycle cogset, which can be either a freewheel or a cassette.

The set of rear sprockets that attaches to the hub on the rear wheel is known as a cogset.

Cone: pressed against the cup, it holds the bearings in place.

Cotter: a pin used to connect cottered cranks.

Coupler: a device used to join two pieces of tubing together.

Cranksets or chainsets are made up of cranks and at least one chainring.

Cup: receives ball bearings that roll along its inner surface; can be pressed into older bottom bracket shells or integrated on most conventional hubs. Also see Cone.

A cyclocomputer is a piece of electronic equipment that measures and displays instantaneous and cumulative speed and distance. Other measurements, such as heart rate, are frequently provided.

Derailleur hanger: a piece on the back dropout to which the derailleur is attached.

Derailleur: a group of levers, usually cable-actuated, that move the chain between cassette or chainring sprockets.

Down tube: The tube that runs from the head tube to the bottom bracket on a bicycle frame.

Dropout: a fork end on a bicycle that allows the rear wheel to be removed without first derailing the chain. The term "dropout" is frequently used incorrectly to refer to any fork end; however, not all fork ends are dropouts.

Any cap that serves to keep dirt and contamination out of an assembly is referred to as a dustcap. Over crank bolts are common, and are frequently made of plastic.

Dynamo: a bicycle lighting component that is also referred to as a generator.


1) Attachment point on the frame, fork, or dropout for fenders, racks, and so on.

2) a hole in the rim through which a spoke nipple can pass to attach to a spoke

Electronic Gear-Shifting System: a complete system that includes switches instead of levers, wires instead of Bowden cables, and motor-driven derailleurs that must all work together.

A fairing is a complete or partial covering for a bicycle that reduces aerodynamic drag or protects the rider from the elements.

Fender or mudguard: curved metal or plastic pieces above the tires that catch and redirect road spray thrown up by the tires, allowing the rider to stay relatively clean. Pairs are possible.

A ferrule is a metal or plastic sleeve that is used to seal the end of a cable housing.

Fork: a mechanical assembly that connects the frame of a bicycle to the front wheel and handlebars, allowing steering via the steerer tube.

Fork crown: the point where the two fork blades meet below the steerer tube.

Fork end: a pair of slots on a fork or frame where the axle of a wheel is attached. Also see Dropout

The frame is the mechanical core of a bicycle, providing points of attachment for the various components that comprise the machine. The term can refer to the base section, which always includes the bottom bracket, or to the base frame, fork, and suspension components such as a shock absorber.

A freehub is a ratcheting assembly that holds a cog or cassette and allows the bicycle to coast without the pedals turning.

The term "freewheel" refers to a ratcheting assembly that includes one or more cogs and allows the bicycle to coast without the pedals turning.

Gussets are plates that are attached to the outsides of frame tubes to strengthen joints. This is more common on BMX and mountain bikes.

The derailleur is attached to a hanger, which is a part of the frame or an attachment to the frame (see Derailleur hanger)

Handlebar: a lever attached to the fork's steerer tube, usually via an intermediary stem. Allows steering and serves as a mounting point for controls and accessories.

Handlebar adapter: see Plugs for bars

Handlebar tape is a tape that is wrapped around dropped handlebars to provide padding and grip. It is usually made of cork or cloth, but it can also be made of foam rubber.

The manufacturer's or brand's logo is affixed to the head tube as a head badge.

The tube of a bicycle frame that houses the headset is known as the head tube.

Headset: the bearings that connect the frame to the fork steerer tube.

Hood: the rubber brake lever cover found on bikes with drop handlebars.

The hub is the core of a wheel; it contains bearings and, in a traditional wheel, has drilled flanges for spoke attachment.

Hub dynamo: a generator housed within one of the hubs that powers lights or other accessories.

Hub gear: a gearbox mounted inside the hub; 3-speed is the most common, 5- and 7-speed hubs are available ("Sturmey-Archer"), and Rohloff manufactures a 14-speed hub. One or two cables operate the cable.

A turn signal is an indicator.

Inner tube: a bladder containing air that is used to inflate a tire. For inflation and deflation, it has a Schrader, "Woods"/"Dunlop," or Presta valve.

One of the two small sprockets of the rear derailleur that guides the chain is known as a jockey wheel or a pulley wheel.

A kickstand is a folding attachment that helps a bicycle stand on its own. Mounts to the frame near the bottom bracket, and sometimes near the rear dropouts.

"Lawyer lips": also known as a "lawyer tab," a retention device on the front fork dropouts that prevents the front wheel from being lost inadvertently if it is not properly secured.

A locknut is a nut that is designed not to loosen due to vibration.

A lockring is a ring, usually made of metal and of varying design, that serves to hold a component in place.

A lug is a metal connector that is used to align frame components where they join.

Luggage carrier: any piece of accessory equipment designed to transport tools, equipment, or cargo.

A master link is a bicycle chain accessory that enables the easy removal and reconnection of an installed bicycle chain without the use of a chain tool.

Nipple: a specialized nut used to secure a spoke to a wheel rim. It provides attachment to the hub in some systems.

Panniers are zippered storage bags made of cloth that attach to the sides of luggage racks. Pan-ear is pronounced pan-yer (an old English word, which is derived from an old French word)

Pedal: the mechanical link between the foot and the crank arm. There are two types: one that secures the foot with a mechanical clamp or cage and one that does not have any connection to lock the foot to the pedal.

Peg: a short metal tube about 6 inches (15 cm) long and 2 inches (5.1 cm) wide that is attached to one or both ends of the wheel axles to allow the rider to perform certain tricks or to provide a place for extra riders to stand or rest.

A portage strap is a strap (usually made of leather) that is attached to the inside of the bike frame to make carrying the bike over one's shoulder easier.

See also: pulley wheel The jockey wheel

A power meter is a device on a bicycle that measures the rider's power output.

A skewer with a lever on one end that loosens when the lever is flipped. Used to detach wheels and seat posts.

Rack: a general carrier rack that attaches behind the seat, usually with stays to the rear dropouts.

Reflector: a device that reflects light to make a bicycle visible when it is illuminated by the headlights of other vehicles. Many cyclists despise this requirement, which is usually mandated by law.

Removable training wheels: These are used to help with balance. It comes in a pair. This is especially useful for first-time bicyclists.

Rim: the part of a wheel to which the tire is attached, which is frequently used as part of the braking mechanism.


1) A disc brake's disc component.

2) Another term for a detangler, which is a device that allows the handlebars and fork to rotate indefinitely without tangling the rear brake cable.

Extension and interrupt brake levers are examples of safety levers. Used to apply brakes to a bicycle in order for it to slow down or come to a complete stop.

What a bicyclist sits on is referred to as a saddle or seat.

Seat rails: a metal framework over which the saddlecloth is stretched. A clamp connects the seat post to the seat rails.

Seat lug: a frame lug on the top of the seat tube that serves as a point of attachment for a clamp that holds the seat post in place.

Seat tube: the roughly vertical tube that runs from the seat to the bottom bracket of a bicycle frame.

A seat bag is a small storage accessory that hangs from the back of a seat.

Seatpost: a post to which the seat is attached. It slides into the seat tube of the frame and adjusts ride height based on how far into the seat tube it is inserted.

Seatstay: a frame component consisting of small diameter tubes running from the top of the seat tube to the rear dropouts.

Shaft-drive is an alternative to chain-drive.

Shifter: Control for Gear Shifting

Shock absorber: a device that limits the rate at which a bicycle's suspension rebounds after absorbing an impact.

Side view mirror: allows you to check the sides before moving slowly or turning to the left or right.

Skirt guard or coatguard: a device that is fitted over the rear wheel of a bicycle to prevent a long skirt, coat, or other trailing clothes or luggage from becoming entangled in the wheel or the gap between the rim and the brakes.

Spindle: an axle that rotates a pedal; threaded at one end to screw into crank arms.

Spoke: the component that connects the wheel rim to the hub. Wire that has one end swaged to form a head and one threaded end. A standard wheel has 36 spokes.

Speakers: Specially designed loudspeakers for bicycles and/or strollers that allow cyclists and pedestrians with children to listen to music or answer phone calls on their mobile devices while bicycling or transporting children. Wireless and wired speakers can be mounted on their handlebars or frames. Although speakers designed specifically for bicycles are available for purchase, depending on the size and shape of the bicycles, as well as the cyclists' ingenuity, any speakers can be strapped on to them using silicone strappings.These speakers were designed to eliminate the risks associated with wearing headphones, such as being unaware of approaching cars and other warnings, and the continuous play of music from them would also alert other cyclists and pedestrians nearby.

Sprocket or cog: a wheel with teeth that mesh with the chain; one of the cogset or crankset's wheels.

Steerer tube: a tube on top of a fork that is inserted through the frame and serves as an axle to steer the bicycle.

Stem: a bracket that connects the handlebars to the fork's steerer tube. Pinch bolts are typically used to secure the item.

Tire: as it is commonly used. Typically, pneumatic. Tubular tires are glued to the wheel rim; most tires use tubes, but tubeless tires and rims are becoming more popular.

Toe clips are metal or plastic cages that are attached to the pedal. There is usually an adjustment strap. Secures the foot to the pedal, allowing for greater control and a more efficient transfer of power from the foot to the drive chain.

Top tube: The frame member that connects the head tube to the seat tube.

Valve stem, also known as a valve, is a port for adding or releasing air from the inner tube. Presta and Schrader are the two most common types. The Woods/Dunlop valve, a third type, can still be found in Europe and Asia.

Wheel: as it is commonly used. Traditionally, and most commonly,

Wingnut: used to attach wheels prior to the development of the quick release skewer.

disk brakes


rear derailleur

pedal crank arm

Bicycle parts



front set

saddle area

Types of bikes

  • Road bikes: Roads.

  • Off-road mountain bikes.

  • Hybrid/commuter bikes offer a little bit of everything.

  • Cyclocross bikes are a cross between a road bike and a mountain bike.

  • Folding bikes are ideal for commuting, leisure, or touring when space is limited.

  • Electric bikes: a little bit of everything with an electric motor.

  • Touring bikes are built to transport loads over longer distances while remaining comfortable for the rider.

  • Women's bikes: All of the above, but specifically designed for women.