BKU / COMPONENTS

See the bicycle as systems and interfaces.

28 component records are grouped by primary system role. Every component can connect to mechanisms, geometry references and compatibility questions without pretending a generic graph can certify a specific product fit.

BRAKING

Braking

COMPONENT

Brake system

Converts rider control input into decelerating force at a braking interface

Open entity →

COMPONENT

Brake lever

Turns rider hand input into mechanical or hydraulic brake-system input

Graph record · detail page deferred

COMPONENT

Brake caliper

Applies pads to a rotor or rim depending on brake architecture

Graph record · detail page deferred

COMPONENT

Disc rotor

Rotating braking surface attached at the wheel hub in a disc-brake system

Graph record · detail page deferred

CONTROL

Control

COMPONENT

Shifter

Provides rider input to a gear-changing mechanism

Graph record · detail page deferred

DRIVETRAIN

Drivetrain

COMPONENT

Crankset

Turns rider pedal input into rotation at the chainring or other drive element

Graph record · detail page deferred

COMPONENT

Chain

Transfers tensile drive load between toothed elements in a chain drivetrain

Graph record · detail page deferred

COMPONENT

Rear sprocket / cassette

Provides one or more rear toothed ratios for a chain drivetrain

Graph record · detail page deferred

COMPONENT

Bottom bracket

Provides the rotational interface for the crank spindle or axle within/at the frame

Graph record · detail page deferred

COMPONENT

Chainring

Front toothed element that drives the chain

Graph record · detail page deferred

COMPONENT

Derailleur

Guides chain position among selectable sprockets or chainrings when used in a derailleur system

Open entity →

COMPONENT

Freehub body

Carries a compatible cassette interface while allowing coasting in common hub architectures

Graph record · detail page deferred

RIDER INTERFACE

Rider Interface

COMPONENT

Handlebar

Provides hand positions and carries steering/braking/shifting controls

Graph record · detail page deferred

COMPONENT

Saddle

Supports the rider at one contact point

Graph record · detail page deferred

COMPONENT

Seatpost

Positions the saddle relative to the frame

Graph record · detail page deferred

COMPONENT

Pedal

Provides the foot interface through which rider force enters the crank

Graph record · detail page deferred

COMPONENT

Dropper seatpost

Allows saddle height to be changed while riding when the system is actuated

Graph record · detail page deferred

ROLLING

Rolling

COMPONENT

Wheel

Supports the tire and rotates about the hub axle

Open entity →COMPONENT

Tire

Provides the bicycle-ground contact envelope and contains or supports inflation depending on system

Open entity →

COMPONENT

Hub

Carries wheel bearings and locates the wheel on its axle interface

Graph record · detail page deferred

COMPONENT

Rim

Supports the tire and anchors spokes in a conventional tension-spoked wheel

Graph record · detail page deferred

COMPONENT

Spoke

Links hub and rim in a tension-spoked wheel

Graph record · detail page deferred

STEERING

Steering

COMPONENT

Stem

Connects handlebar to steerer or steering structure

Graph record · detail page deferred

STEERING INTERFACE

Steering Interface

COMPONENT

Headset

Provides the bearing interface that lets the steering assembly rotate relative to the frame

Open entity →

STRUCTURE

Structure

COMPONENT

Frame

Carries the main structural relationships among rider interfaces, wheels and drivetrain mounting points

Open entity →

COMPONENT

Fork

Locates the front wheel relative to the steering axis and frame

Graph record · detail page deferred

SUSPENSION

Suspension

COMPONENT

Suspension fork

Combines steering/wheel location with controlled suspension travel

Graph record · detail page deferred

COMPONENT

Rear shock

Spring/damper unit used within a rear-suspension linkage or frame system

Graph record · detail page deferred

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