Adaptive cycle
Adaptive cycle archetype organized around rider-specific access and mobility.
BKU / EXPLORE
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Showing 112 entities.
Aluminum alloy
common bicycle structural material used in frames and components
Bicycle commuting
Bicycle commuting considered as a riding environment and set of rider problems, not merely a label.
Open entity →DisciplineBicycle touring
Bicycle touring considered as a riding environment and set of rider problems, not merely a label.
Open entity →Bicycle trials
Bicycle trials considered as a riding environment and set of rider problems, not merely a label.
Bikepacking
Bikepacking considered as a riding environment and set of rider problems, not merely a label.
BMX
BMX considered as a riding environment and set of rider problems, not merely a label.
BMX bike
BMX bike archetype organized around race or freestyle.
BMX origins in California
The UCI describes BMX as beginning in California in the late 1960s, inspired by motocross and developed through youth bicycle racing on self-built tracks.
Bottom bracket
Provides the rotational interface for the crank spindle or axle within/at the frame
Bottom bracket ↔ crank ↔ frame interface
Structured BKU record.
Bottom-bracket drop
Vertical relationship between the wheel axle line and bottom-bracket center, commonly expressed as how far the bottom bracket sits below the axle line.
Bottom-bracket height
Vertical distance from the ground reference to bottom-bracket center for a stated wheel/tire setup.
Brake caliper
Applies pads to a rotor or rim depending on brake architecture
Brake lever
Turns rider hand input into mechanical or hydraulic brake-system input
Brake system
Converts rider control input into decelerating force at a braking interface
Open entity →Cadence
Crank revolutions per minute.
Carbon-fiber composite
used where designers can tailor shape and laminate structure
Cargo bike
Cargo bike archetype organized around utility hauling.
Open entity →Cargo cycling
Cargo cycling considered as a riding environment and set of rider problems, not merely a label.
Cassette ↔ freehub interface
Structured BKU record.
Chain
Transfers tensile drive load between toothed elements in a chain drivetrain
Chain drive
Structured BKU record.
Open entity →Chainring
Front toothed element that drives the chain
Chainstay length
Distance from bottom-bracket center to rear-axle center under a stated measurement convention.
Commuter bike
Commuter bike archetype organized around everyday transport.
Crankset
Turns rider pedal input into rotation at the chainring or other drive element
Cross-country MTB
Cross-country MTB considered as a riding environment and set of rider problems, not merely a label.
Cyclocross
Cyclocross considered as a riding environment and set of rider problems, not merely a label.
Cyclocross bike
Cyclocross bike archetype organized around closed-course mixed terrain.
Derailleur
Guides chain position among selectable sprockets or chainrings when used in a derailleur system
Open entity →MechanismDerailleur shifting
Structured BKU record.
Open entity →Development
Distance traveled per crank revolution in the simplified no-slip gearing model used by BKU Gear Lab.
Dirt-jump bike
Dirt-jump bike archetype organized around jump lines and pump-style terrain.
Disc braking
Structured BKU record.
Open entity →Disc rotor
Rotating braking surface attached at the wheel hub in a disc-brake system
Disc rotor ↔ hub interface
Structured BKU record.
Downhill MTB
Downhill MTB considered as a riding environment and set of rider problems, not merely a label.
Dropper seatpost
Allows saddle height to be changed while riding when the system is actuated
E-bike
E-bike archetype organized around electrically assisted cycling.
Effective top-tube length
Horizontal reference between seat-tube and head-tube/steering references intended to normalize sloping top-tube layouts.
Enduro MTB
Enduro MTB considered as a riding environment and set of rider problems, not merely a label.
Fat bike
Fat bike archetype organized around soft or loose surfaces.
Fixed-gear drive
Structured BKU record.
Folding bike
Folding bike archetype organized around multimodal transport and storage.
Fork
Locates the front wheel relative to the steering axis and frame
Fork offset / rake
Distance describing the front-axle center position relative to the steering-axis line under a stated convention.
Frame
Carries the main structural relationships among rider interfaces, wheels and drivetrain mounting points
Open entity →Freehub body
Carries a compatible cassette interface while allowing coasting in common hub architectures
Freewheel / freehub coasting
Structured BKU record.
From hand input to wheel deceleration
Structured BKU record.
Front center
Distance from bottom-bracket center to front-axle center.
Gear inches
A traditional gearing measure computed in BKU Gear Lab as gear ratio multiplied by effective wheel diameter in inches.
Gear ratio
In the simple chain-drive calculation used by BKU Gear Lab, front chainring teeth divided by rear sprocket teeth.
Geometry foundations
Structured BKU record.
Gravel bike
Gravel bike archetype organized around mixed surfaces.
Open entity →DisciplineGravel cycling
Gravel cycling considered as a riding environment and set of rider problems, not merely a label.
Open entity →Handlebar
Provides hand positions and carries steering/braking/shifting controls
Head-tube angle
Angle used to describe the orientation of the head tube / steering axis relative to the ground plane under a stated convention.
Open entity →ComponentHeadset
Provides the bearing interface that lets the steering assembly rotate relative to the frame
Open entity →Hub
Carries wheel bearings and locates the wheel on its axle interface
Hub ↔ frame/fork axle interface
Structured BKU record.
Hybrid bike
Hybrid bike archetype organized around general-purpose paved and light mixed use.
Mechanical trail
Horizontal ground-plane distance between the steering-axis intersection with the ground and the tire contact-point reference in a simplified bicycle geometry model.
Open entity →Bike typeMountain bike
Mountain bike archetype organized around trails.
Open entity →Mountain biking
Mountain biking considered as a riding environment and set of rider problems, not merely a label.
Mountain-bike origins in 1970s California
The UCI describes mountain biking as widely acknowledged to have origins in 1970s California, with riders modifying and racing bicycles on Marin County mountain tracks.
Open entity →Ordinary / high-wheel bicycle
By the early 1870s wire-spoked high-wheel bicycles were established; the Smithsonian describes James Starley introducing the Ariel in 1871 and the form later becoming known as the Ordinary.
Pedal
Provides the foot interface through which rider force enters the crank
Pedal ↔ crank interface
Structured BKU record.
Pneumatic bicycle tire, 1888 evidence
The Science Museum Group catalogs a Dunlop pneumatic cycle tyre dated 1888; Smithsonian history places Dunlop’s pneumatic-tire patent soon after the rise of the Safety bicycle.
Pneumatic tire support
Structured BKU record.
Reach
Horizontal frame reference from the bottom-bracket center to a defined upper head-tube/steering-axis reference point under common geometry conventions.
Open entity →Rear shock
Spring/damper unit used within a rear-suspension linkage or frame system
Rear sprocket / cassette
Provides one or more rear toothed ratios for a chain drivetrain
Recumbent bicycle
Recumbent bicycle archetype organized around seated or reclined rider position.
Rim
Supports the tire and anchors spokes in a conventional tension-spoked wheel
Rim braking
Structured BKU record.
Road bike
Road bike archetype organized around paved riding.
Open entity →Road cycling
Road cycling considered as a riding environment and set of rider problems, not merely a label.
Rolling resistance
Energy loss associated with rolling deformation and contact processes; it depends on more than tire width or pressure alone.
Saddle
Supports the rider at one contact point
Safety bicycle transition
Smithsonian history describes Safety bicycles gaining popularity with two smaller wheels of similar size, chain drive and gearing, as designers sought safer alternatives to the Ordinary.
Open entity →Seat-tube angle
Angle describing the seat-tube axis relative to a ground/horizontal reference under a stated convention.
Seatpost
Positions the saddle relative to the frame
Shifter
Provides rider input to a gear-changing mechanism
Sourced historical turning points
Structured BKU record.
Spoke
Links hub and rim in a tension-spoked wheel
Stack
Vertical frame reference from the bottom-bracket center to a defined upper head-tube/steering-axis reference point under common geometry conventions.
Open entity →Standover height
Ground-to-frame height measured at a stated point on or near the top tube.
Steel
widely used bicycle structural material with many alloys and construction methods
Steerer ↔ headset ↔ frame interface
Structured BKU record.
Steering rotation
Structured BKU record.
Stem
Connects handlebar to steerer or steering structure
Stem ↔ handlebar interface
Structured BKU record.
Suspension fork
Combines steering/wheel location with controlled suspension travel
Suspension spring + damping
Structured BKU record.
Tandem bicycle
Tandem bicycle archetype organized around two or more riders in-line.
Tire
Provides the bicycle-ground contact envelope and contains or supports inflation depending on system
Open entity →Tire pressure
Internal inflation pressure in a pneumatic tire system; appropriate values depend on the complete tire/rim/load/use case.
Tire ↔ rim interface
Structured BKU record.
Titanium alloy
used in some frames and components where corrosion resistance and strength-to-mass goals are valued
Touring bike
Touring bike archetype organized around distance with luggage.
Open entity →Track bike
Track bike archetype organized around velodrome.
Track cycling
Track cycling considered as a riding environment and set of rider problems, not merely a label.
Trail mountain biking
Trail mountain biking considered as a riding environment and set of rider problems, not merely a label.
Open entity →Triathlon / time-trial bike
Triathlon / time-trial bike archetype organized around aerodynamic solo efforts.
Ways to move one bicycle
Structured BKU record.
Wheel
Supports the tire and rotates about the hub axle
Open entity →GeometryWheelbase
Distance between front and rear axle centers.
Open entity →Where the bicycle touches the world
Structured BKU record.
Wood / laminated wood
historically and experimentally used in some bicycle structures
EDITORIAL TRAILS
Prefer a guided route?
Three sequences cross families while keeping every step reusable elsewhere.
TRAIL
Mixed-surface confidence
I want one bicycle path that can move between pavement and unpaved surfaces without pretending every mixed surface is the same.
TRAILEveryday transport
I need a practical bicycle system for repeated trips, carrying needs and predictable maintenance.
TRAILTechnical trail control
I want to understand the machine relationships that matter when trail terrain becomes more technical.
ICU / CONNECTED DISCOVERY
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