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2. Freehub - Wikipedia

   en.wikipedia.org/wiki/Freehub

   The chain gear sprockets wear faster than the ratcheting mechanism. Replacing individual sprockets on a freehub cassette is easy compared to that on some freewheels. The ball bearings for the wheel's axle are in the hub, but a multi-speed freewheel requires a considerable distance between the drive-side bearings and the drive-side frame dropout ...

3. 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 ...

4. Flip-flop hub - Wikipedia

   en.wikipedia.org/wiki/Flip-flop_hub

   Their main purpose is to allow changing between two (and only two) different gear ratios on one rear wheel without the added complications of a multi-gear derailleur or internal hub gear, or between fixed and freewheel options. By removing the rear wheel and turning it around, the rider can switch between the two options.

5. List of bicycle parts - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_parts

   Cartridge bearing: a type of bearing that is not user-serviceable, but must be replaced as a unit; Cassette: a group of stacked sprockets on the rear wheel of a bicycle with a rear derailleur; Coaster brake or backpedal brake; Chain: a system of interlinking pins, plates and rollers that transmits power from the front sprocket(s) to the rear ...

6. Locking hubs - Wikipedia

   en.wikipedia.org/wiki/Locking_hubs

   This is done to reduce the mechanical resistance of the front-portion of the drivetrain when four-wheel drive is not in use. [1] The hub, along with the wheel, is designed to engage (lock) onto the axle, to be powered by the drivetrain in four-wheel drive; or the hub can disengage (unlock) from the axle when four-wheel drive is not needed, thus ...

7. Hub gear - Wikipedia

   en.wikipedia.org/wiki/Hub_gear

   The rear wheel cannot be completely separated from a bicycle with hub gears without also disconnecting the gear cable (and any coaster-brake clamp), which complicates the process of replacing an inner tube (of course, one can still patch an innertube without removing a wheel). The hub gear is an integral part of the wheel and it is not possible ...