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Technical entry
Indexed Shifting
Indexed shifting uses defined shifter positions to move a derailleur or internal gear mechanism between specific gears. In a […]
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Oval Chainring
An oval chainring is a non-round chainring that changes the drivetrain’s effective gear ratio as the cranks rotate. Its […]
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Cadence Sensor
A cadence sensor detects crank rotation in an e-bike pedal-assist system. It tells the controller when the rider is […]
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Pedal Assist (PAS)
Pedal assist, commonly abbreviated PAS, is an e-bike control system that activates the motor in response to the rider […]
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Torque Sensor
A torque sensor measures twisting force within an e-bike’s pedal or drivetrain system. The controller combines this signal with […]
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Prepreg Carbon
Prepreg carbon is carbon-fiber reinforcement supplied with a controlled amount of resin already incorporated into it. It is the […]
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Layup Schedule
A layup schedule is the manufacturing plan that defines the material, shape, orientation, position, and stacking order of every […]
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Bladder Molding
Bladder molding is a composite manufacturing process used to produce hollow carbon-fiber structures. Prepreg carbon is placed in a […]
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Resin Transfer Molding (RTM)
Resin Transfer Molding (RTM) is a composite manufacturing process in which liquid resin is injected into a closed mold […]
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Universal Derailleur Hanger (UDH)
The Universal Derailleur Hanger (UDH) is a standardized frame and hanger interface introduced by SRAM in 2019. It gives […]
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I-Spec
I-Spec is Shimano’s family of integrated handlebar mounts for attaching a compatible shifter or electronic switch to a brake […]
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Boost Spacing
Boost is a mountain-bike hub-spacing standard that uses 110 mm front and 148 mm rear hub widths with thru-axles. […]
Read entryTopics intentionally overlap. A drivetrain component can also be a technology; an e-bike system can include components, software, and manufacturing concepts. Cross-listing keeps related reference material discoverable from more than one path.
Technical entries are one part of bicycle knowledge for the life of the bike. Discover bicycles in the Archive, use the Encyclopedia to understand them, then carry useful context into Bike Reports or My Garage.