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Adjustable cup
The left-side cup in the bottom bracket, which can be screwed in or out to adjust the bottom bracket bearings. Its also the cup to remove when overhauling the bottom bracket.

A headset design that uses a threadless steerer tube. The steerer tube is secured in the headset bearings by the Stem

A type of grease laced with lead particles, used to prevent two components from corroding together. Mainly used on threaded fasteners - don't use it in bearings (it isn't a high-speed lubricant.

The threaded shaft that passes through the center of the hub that the wheel rotates on. Sometimes used to refer to the bottom bracket spindle.

Axle nut
The nut that threads onto the axle and holds the wheel to the fork or frame.

Axle protrusion
The distance between the bearing cone adjuster locknut on the axle to the end of the axle.

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B-tension screw
The screw at the rear of a Shimano derailleur that adjusts the distance between the derailleur guide wheel and the rear sprockets.

Bar ends
Extensions that bolt onto the ends of a mountain bike handlebar and offer the rider different hand positions. Designed primarily for climbing hills and for use on long stretches of road or trail where the brakes aren't needed.

The part of a clincher tire that you sometimes have to lever up over the rim during installation. Usually reinforced with wire or Kevlar strands.

Bead seat
The part of the rim where the bead of a clincher tire seats.

Bottom bracket
The bearing assembly that the crank arms are attached to.

Bottom bracket shell
The pan of the frame that the bottom bracket is housed in.

Bottom bracket spindle
The shaft that the crank arms attach to and the bottom bracket bearings support. Also referred to as the bottom bracket axle.

Brake block
Another term for brake pad.

Brake centering
Adjusting the brake so both pads are equidistant from the rim while at rest and contact the rim at the same time when the brake Is applied.

Brake pad
The rubber part of the brake that presses against the rim when the brakes are applied. creating friction.

Brake pad toe-in
The difference in distance between the ends of the brake pad and the rim. The trailing end of the pad (in relation to wheel rotation) should contact the rim slightly before the leading end.

Brake release (or quick release)
A lever or button that can be disengaged to allow the brake pads to spread apart. making wheel removal easter.

Small mounting bosses on a bike frame for attaching water bottle cages, racks, shifters, derailleurs, brake arms, etc., attached by the process of brazing.

Butted spoke
A spoke that is thicker at the ends than in the middle.

Butted tubing
Frame tubing that is thicker at the ends than in the middle, but has the same outside diameter along its length. This places more material at the stress points and eliminates material in the middle, which makes for lighter tubing.

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A control mechanism, composed of an inner cable (stranded wire) and an outer casing, used for operating derailleurs and brakes.

Cable carrier
The component in a link-wire cantilever brake system that joins the brake cable going to one brake arm with the link wire that goes to the other arm.

Cable hanger
A mounting boss that holds a cable casing but lets the inner cable pass through.

Pedaling rpm (revolutions per minute).

1. On the rear derailleur, the two plates that hold the tension and guide wheels. 2. On the front derailleur, the two parallel plates that move the chain from chainring-to-chainring. 3. A frame mounted water bottle holder. 4. Ball bearing retainer.

The parts of a brake that the cable pulls on, through which force is transmitted to push the brake pads against the rim. Also called brake arms.

Cantilever brake
A brake with two caliper arms, each one being mounted on opposite sides of the frame or fork. The most common type of brake found on mountain bikes.

Cartridge bottom bracket
A self-contained, non-serviceable bottom bracket axle and bearing assembly.

Center-pull brake
A brake design in which the caliper arms pivot on a common mount attached to the frame or fork, each arm being attached by a straddle cable which the main brake cable pulls.

Chain breaker
A tool used for driving a rivet out of a chain to separate it and then driving it back in again to rejoin the chain.

Chain rivet
The pins of a chain that connect the individual Iinks.

Chain roller
The round part between the plates of a chain that engage between the teeth of the sprockets and chainrings.

Chain stretch
The amount a chain "grows" as the rivets and rollers wear out.

Chain whip
A tool used for unscrewing the small sprocket to disassemble a freewheel, and also used to prevent a freehub from turning while unscrewing the lockring. Composed of a metal bar, a short length of chain to grip the sprocket, and a longer length of chain that wraps around the sprocket to pull on it.

A protective covering over the chain and chainrings, designed primarily to keep fingers and clothing from getting caught in the chain

The large sprocket(s) on a crankset that pull on the chain as the cranks are turned. Sometimes referred to as a chainwheel.

The parts of a frame that make up the bottom portion of the rear triangle; the two tubes that travel be- tween the bottom bracket and the rear wheel dropouts.

See Chainring.

The common term used to describe any bike tire that uses a separate inner tube.

Clipless pedal
A type of pedal that incorporates a foot retention system that doesn't use straps.

Another term for the rear sprockets.

The inner race of a ball-type bearing assembly. Found on axles and some bottom brackets.

Crank arm
The part of a crankset that connects the pedal to the bottom bracket.

Crank puller
A tool required to remove the crank arms from the bottom bracket spindle.

The components that work together to pull the chain: comprised of the bottom bracket, crank arms, and chainring(s).

The outer race of a ball-type bearing assembly. Found on bottom brackets and headsets. (On axle bearings the cup is integral with the hub.)

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The cable-actuated mechanism used for shifting the chain from one sprocket or chainring to another.

Derailleur chain
Type of chain designed for use with derailleur shifting systems

Derailleur hanger
The protrusion on the rear-wheel dropout to which the derailleur mounts.

The position of the hub in relation to the rim. A wheel whose hub flanges protrude equidistant from each side of the rim has zero dish. Rear wheels on multi-speed bikes must have a certain amount of dish to make room for the freewheel or freehub sprockets.

Down tube
The part of the frame that travels from the head tube to the bottom bracket: it forms the bottom part of the front triangle.

Drop bars
Typical handlebars found on road bikes that curve down from the tops of the bars.

The machined plates with slots that a wheel axle fits into: also the slots themselves.

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The metal cap on the end of the cable casing.

Fixed cup
The cup of an adjustable bottom bracket assembly that Is threaded into the right-hand side of the frame.

The tubes that hold the front wheel to the bike.

Fork crown
The part of a fork that attaches the fork blades or tubes to the steerer tube.

Fourth-hand tool
A tool used for pulling cables tight.

A ratcheting mechanism to which the rear sprockets mount, also incorporating the drive-side axle bearing.

A ratcheting mechanism to which the rear sprockets mount, independent of the wheel axle bearings.

Freewheel remover
A special tool used for removing a freewheel.

Friction shifters
Non-index type shift levers that rely on friction to hold the derailleur in position.

Front triangle
The front structural part of the frame, comprised of the top tube. seat tube, head tube, and down tube.

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Another term for the stem.

A type of index shifter that changes gears by rotating the innermost part of the handgrip.

Guide wheel
The upper wheel of a rear derailleur - it moves the chain from one sprocket to another.

"H" screw
The adjustment screw on a derailleur that sets the limit of travel towards the high gear (big chainring up front, small sprocket at the rear). When adjusted correctly it prevents the chain from jumping off between the small sprocket and the frame (rear) or off the large chainring (front).

Head tube
The part of the frame that the fork steerer tube passes through.

The bearings that support the fork steerer tube.

The center portion of the wheel, containing the axle and bearings.

Hyperglide chain
Derailleur chain designed for use with Shimano Hyperglide shifting systems, with specially shaped plates to provide quick, smooth shifting. Requires a special replacement rivet if separated.

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Idler wheels
Another term for the guide and tension wheels of the rear derailleur.

Index shifters
Shifters that change gears with a click of the lever.

Indexed steering
"Notchy" steering caused by a worn-out headset.

Jockey wheels
Another term for the guide and tension wheels of the rear derailleur.

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"L" screw
The adjustment screw on a derailleur that sets the limit of travel towards the low gear (big sprocket on the rear, small chainring on the front). When adjusted correctly it prevents the chain from jumping off the big rear sprocket and tearing out spokes or from coming off the small front chainring and landing on the bottom bracket shell.

Link-wire cantilever brake
A cantilever brake setup where the main cable connects to one cantilever arm and the other arm is connected to the main cable by a shorter cable and cable carrier.

A nut that tightens up against an adjuster nut to prevent it from moving.

The ring nut that threads over the left side bottom bracket bearing cup and locks it to the bottom bracket shell when tightened.

Castings with external metal tubes into which frame tubes are brazed or glued.

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Main triangle
See Front triangle.

Master link
A link chain that can be separated without having to drive out a rivet.

Narrow chain
Derailleur chain with a narrower width than a standard derailleur chain. Most require a special replacement pin if separated.

The nuts that fit through holes in the rim and thread onto the ends of the spokes.

Presta valve
A type of tire tube valve that has a small nut on top that must be loosened to add or release air.

A device that allows rapid detachment or adjustment of a component. Found on some wheels and seat binder bolts.

Quick-release skewer
The thin rod that passes through the center of a hollow axle.

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The part of a bearing assembly that the bearing balls or rollers contact.

Rear triangle
The rear structural part of the frame, made up of the seat stays, chain stays, and seat tube.

The plastic or pressed metal cage that holds bail bearings a specified distance from each other.

The outer portion of the wheel that the tire fits on.

Rim strip
A rubber liner that encircles the rim and covers the spoke nipples to prevent them from damaging the tube.

Rim tape
Cloth adhesive tape that performs the same function as a rim strip.

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Another term used for a bicycle seat.

Schrader valve
An automotive-type tire valve.

A synthetic rubber boot or flange that fits over a bearing to keep contaminants out.

Seat post
The tube that the seat mounts to.

Seat stays
The tubes of a frame that span the distance between the seat tube and the rear dropouts.

Seat tube
The vertical part of the frame that forms the rear of the front triangle, running between the bottom bracket and the top tube.

Sew-up tire
A tire that has its tube stitched inside: must be glued to the rim.

See Quick-release skewer.

The part of the right-side crank arm that the chainrings attach to.

To pedal at a high cadence.

The part of a bottom bracket that the crank arms attach to.

The wires that extend from the hub to the rim.

Spoke guard
A plate, made from plastic or metal, that prevents the chain from tearing out the drive-side spokes on the rear wheel if the chain jumps off the largest rear sprocket.

Spoke nipples
See Nipples.

Spoke wrench
A wrench used to turn spoke nipples.

A gear on the rear wheel.

Steerer tube
The part of the fork that passes through the head tube of the frame and is supported by the headset bearings.

The part that connects the handlebar to the fork steerer tube.

Stem binder bolt
The bolt in the center of a conventional stem that pulls up on a wedge when tightened, fixing the stem's position in the fork steerer tube.

Straddle cable
A cable that attaches one brake arm to another. Used in straddle-cable cantilever brakes and center-pull brakes.

Straddle-cable cantilever brake
A cantilever brake setup where the main cable connects to a yoke, which connects to a cable running between the two cantilever arms.

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Tension wheel
The lower wheel of a rear derailleur - it maintains tension on the bottom run of the chain

Third-hand tool
A tool that squeezes the brake pads against the rim to ease cable adjustment.

Tire lever
A small plastic lever used to pry a tire off of the rim. Usually more than one is required.

Toe clip
A foot retention system mounted on the pedal, consisting of a metal or plastic cage that covers the front part of the foot, sometimes secured at the rear by a strap that tightens over the center part of the foot.

Top tube
The upper part of the front triangle, connected to the head tube and the seat tube.

Truing stand
A fixture that is used to true-up wheels.

The straightness, both laterally and axially, of a wheel as it rotates.

See Sew-up tire.

A type of brake that is similar to a cross between a center-pull brake and a cantilever brake.

Valve stem
The part of an inner tube that protrudes through the rim that air is added to.

Wheel dish
See Dish.

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