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  2. Bicycle drivetrain systems - Wikipedia

    en.wikipedia.org/wiki/Bicycle_drivetrain_systems

    In 1991, a two-wheel drive bicycle was marketed under the Legacy name. It used a flexible shaft and two bevel gears to transmit torque from the rear wheel, driven by a conventional bicycle chain with derailleurs, to the front wheel. [11] In 1994, Steve Christini and Mike Dunn introduced a two-wheel drive option. [12]

  3. Fixed-gear bicycle - Wikipedia

    en.wikipedia.org/wiki/Fixed-gear_bicycle

    A fixed-gear bicycle (or fixed-wheel bicycle in British usage, [citation needed] commonly known in some places as a fixie [1]) is a bicycle that has a drivetrain with no freewheel mechanism such that the pedals always will spin together with the rear wheel. The freewheel was developed early in the history of bicycle design but the fixed-gear ...

  4. Belt-driven bicycle - Wikipedia

    en.wikipedia.org/wiki/Belt-driven_bicycle

    Belt-driven bicycles and their repair or replacement parts are scarcer at shops than bicycles with conventional chain. Front and rear pulleys or sprockets must be well aligned to avoid excessive friction and wear. A chain is more flexible in this respect. [8] Compared to a chain, belts are typically run at a much higher tension.

  5. Sprocket - Wikipedia

    en.wikipedia.org/wiki/Sprocket

    16 tooth sprocket. Do = Sprocket diameter. Dp = Pitch diameter A sprocket and roller chain. A sprocket, [1] sprocket-wheel [2] or chainwheel is a profiled wheel with teeth that mesh with a chain, rack or other perforated or indented material. [3] [4] The name 'sprocket' applies generally to any wheel upon which radial projections engage a chain ...

  6. Cogset - Wikipedia

    en.wikipedia.org/wiki/Cogset

    On a bicycle, the cassette or cluster [1] is the set of multiple sprockets that attaches to the hub on the rear wheel. A cogset works with a rear derailleur to provide multiple gear ratios to the rider. Cassettes come in two varieties, freewheels or cassettes, of which cassettes are a newer development. Although cassettes and freewheels perform ...

  7. Quick release skewer - Wikipedia

    en.wikipedia.org/wiki/Quick_release_skewer

    The mechanism was invented in 1927 by Tullio Campagnolo, an Italian bicycle racer. He was frustrated when he attempted to change gears during a race. At the time there was but one cog on each side of the rear hub, so gear changes necessitated stopping, removing the rear wheel, flipping it over horizontally so that the opposite cog is engaged by the chain, and finally reinstalling the wheel.