BKU004 / INTERFACE LIBRARY

Compatibility begins with facts the interface requires.

These records now separate three layers: the questions an interface raises, the product facts that must be identified, and the authoritative-document gate that controls any procedure or compatibility conclusion.

INTERFACE 01

Steerer ↔ headset ↔ frame interface

Questions

steerer dimensions
head-tube/headset architecture
bearing seats
retention/preload method

Identify

manufacturer/model or family
interface architecture
dimensions/retention family where relevant
current technical document identifier

PROCEDURE GATE

Confirm the exact product system against current manufacturer technical documentation before any installation, adjustment, replacement or compatibility decision.

This is an interface checklist, not a compatibility declaration. Exact manufacturer documentation controls specific fit.

INTERFACE 02

Stem ↔ handlebar interface

Questions

clamp diameter/shape
clamp width
fastener and torque requirements

Identify

manufacturer/model or family
interface architecture
dimensions/retention family where relevant
current technical document identifier

PROCEDURE GATE

Confirm the exact product system against current manufacturer technical documentation before any installation, adjustment, replacement or compatibility decision.

This is an interface checklist, not a compatibility declaration. Exact manufacturer documentation controls specific fit.

INTERFACE 03

Bottom bracket ↔ crank ↔ frame interface

Questions

frame shell architecture
bearing arrangement
spindle/axle dimensions
retention method

Identify

manufacturer/model or family
interface architecture
dimensions/retention family where relevant
current technical document identifier

PROCEDURE GATE

Confirm the exact product system against current manufacturer technical documentation before any installation, adjustment, replacement or compatibility decision.

This is an interface checklist, not a compatibility declaration. Exact manufacturer documentation controls specific fit.

INTERFACE 04

Pedal ↔ crank interface

Questions

thread or attachment architecture
left/right orientation where applicable
engagement depth

Identify

manufacturer/model or family
interface architecture
dimensions/retention family where relevant
current technical document identifier

PROCEDURE GATE

Confirm the exact product system against current manufacturer technical documentation before any installation, adjustment, replacement or compatibility decision.

This is an interface checklist, not a compatibility declaration. Exact manufacturer documentation controls specific fit.

INTERFACE 05

Hub ↔ frame/fork axle interface

Questions

axle architecture
spacing
diameter
retention method

Identify

manufacturer/model or family
interface architecture
dimensions/retention family where relevant
current technical document identifier

PROCEDURE GATE

Confirm the exact product system against current manufacturer technical documentation before any installation, adjustment, replacement or compatibility decision.

This is an interface checklist, not a compatibility declaration. Exact manufacturer documentation controls specific fit.

INTERFACE 06

Tire ↔ rim interface

Questions

rim/tire architecture
bead-seat dimensions
approved size range
inflation system

Identify

manufacturer/model or family
interface architecture
dimensions/retention family where relevant
current technical document identifier

PROCEDURE GATE

Confirm the exact product system against current manufacturer technical documentation before any installation, adjustment, replacement or compatibility decision.

This is an interface checklist, not a compatibility declaration. Exact manufacturer documentation controls specific fit.

INTERFACE 07

Disc rotor ↔ hub interface

Questions

mount architecture
rotor dimensions
fastener/lockring system

Identify

manufacturer/model or family
interface architecture
dimensions/retention family where relevant
current technical document identifier

PROCEDURE GATE

Confirm the exact product system against current manufacturer technical documentation before any installation, adjustment, replacement or compatibility decision.

This is an interface checklist, not a compatibility declaration. Exact manufacturer documentation controls specific fit.

INTERFACE 08

Cassette ↔ freehub interface

Questions

spline/interface family
sprocket range packaging
retention method

Identify

manufacturer/model or family
interface architecture
dimensions/retention family where relevant
current technical document identifier

PROCEDURE GATE

Confirm the exact product system against current manufacturer technical documentation before any installation, adjustment, replacement or compatibility decision.

This is an interface checklist, not a compatibility declaration. Exact manufacturer documentation controls specific fit.

INTERFACE 09

Rear derailleur ↔ hanger ↔ frame interface

Questions

derailleur mounting architecture
hanger/frame architecture
manufacturer model/generation
specified alignment/mounting reference where applicable

Identify

rear derailleur manufacturer/model
frame/hanger architecture
generation/version
current technical document identifier

PROCEDURE GATE

Use the current manufacturer documentation for the exact derailleur and frame/hanger system before installation, adjustment or replacement.

This interface record does not declare fit, alignment, adjustment or torque. Product-specific documentation controls.

INTERFACE 10

Brake pad ↔ caliper ↔ rotor interface

Questions

caliper/pad family
rotor family and dimensions
approved material combinations
product-specific wear/service limits

Identify

brake manufacturer/model
caliper family
pad family
rotor model/dimensions
current service document identifier

PROCEDURE GATE

Use the exact brake manufacturer service/user documentation for pad, rotor, service-limit and procedure requirements.

BKU does not provide pad/rotor compatibility, wear limits, bleed procedure or torque from this generic interface record.

INTERFACE 11

Chain ↔ sprocket ↔ chainring interface

Questions

drivetrain family/generation
chain and sprocket architecture
chainring/tooth-profile requirements
approved connection/retention method

Identify

drivetrain manufacturer/family
speed/system generation
chain model/family
cassette/freewheel and chainring identifiers
current compatibility/service document identifier

PROCEDURE GATE

Use the current manufacturer compatibility and service documents for the exact drivetrain family before selecting, joining or adjusting parts.

This generic graph edge is not a declaration that any chain, sprocket and chainring combination is compatible.

WORKSHOP BRIDGE

Start from an observation, then arrive here.

The Workshop Explorer uses these interface records to identify missing facts before a product-specific procedure is considered.

Open Workshop / Interface Explorer

BKU007 / NORMALIZED STANDARDS

Generic interface question → named standard → exact product evidence.

The standards layer now normalizes eight source-backed references across axle, brake-mount, rotor, driver, derailleur-mount and tyre/rim systems. A standard identity does not certify an exact product pair.

Inspect standards evidence

ICU / CONNECTED DISCOVERY

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