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Technical entry
Direct Mount Chainring
A direct-mount chainring attaches to a dedicated interface on the crank without using a separate bolt-on spider and conventional […]
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Hyperglide
Hyperglide is Shimano’s cassette-tooth and shift-ramp technology for controlled indexed shifting. Its shaped teeth and strategically positioned ramps guide […]
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Hyperglide+
Hyperglide+ is Shimano’s drivetrain technology for faster, smoother shifting while the rider continues pedaling. It combines specifically shaped cassette […]
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Head Tube Angle
Axle-to-crown is a fork-length measurement taken between the center of the front axle and the crown-race seat at the […]
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Axle-to-Crown
Axle-to-crown is a fork-length measurement taken between the center of the front axle and the crown-race seat at the […]
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Hub Motor
A hub motor is an electric drive unit built into the front or rear wheel hub of an e-bike. […]
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Mid-Drive Motor
A mid-drive motor is an e-bike drive unit positioned near the bottom bracket that sends rider and motor power […]
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Effective Top Tube
Effective top tube (ETT) is the horizontal distance between a specified point on the head tube and the seat-tube […]
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MTB Geometry
MTB geometry is the collection of frame, fork, and wheel dimensions that determines how a mountain bike fits, steers, […]
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Instant Center
The instant center is the point about which a suspension member is momentarily rotating at a specific position in […]
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Front-Center
Front-center describes the distance from the center of a bicycle’s bottom bracket to the front-wheel axle. It is a […]
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The Rise of Full Suspension — 1990s Breakthroughs
The 1990s transformed full-suspension mountain bikes from experimental machines into viable production bicycles. Improvements in rear shocks, aluminum frame […]
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.