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2. Gear inches - Wikipedia

   en.wikipedia.org/wiki/Gear_inches

   Simplified diagram of gear inches: As the rear sprocket is halfed in size, the distance traveled by the rear wheel doubles, at half the torque. Gear inches is an imperial measure corresponding to the diameter in inches of the drive wheel of a penny-farthing bicycle with equivalent ( direct-drive ) gearing.

3. Bicycle gearing - Wikipedia

   en.wikipedia.org/wiki/Bicycle_gearing

   the number of possible gear ratios is 24 (=3×8, this is the number usually quoted in advertisements); the number of usable gear ratios is 22; the number of distinct gear ratios is typically 16 to 18. The combination of 3 chainrings and an 8-sprocket cogset does not result in 24 usable gear ratios.

4. 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 ...

5. Bicycle drivetrain systems - Wikipedia

   en.wikipedia.org/wiki/Bicycle_drivetrain_systems

   A chain drive and rear derailleur gear change, the most popular system in use today A shaft-drive with crankset and rear gear hub Bicycle drivetrain systems are used to transmit power on bicycles , tricycles , quadracycles , unicycles , or other human-powered vehicles from the riders to the drive wheels.

6. Hub gear - Wikipedia

   en.wikipedia.org/wiki/Hub_gear

   A freewheeling hub with a sprocket suitable for narrow chain can be combined with a double or triple crankset and front derailleur, in order to provide a wider range and closer gear ratio spacing. A chain tensioner or a rear derailleur is needed to take up chain slack, and care is needed not to over-torque the hub by using too small a chainring ...

7. Derailleur - Wikipedia

   en.wikipedia.org/wiki/Derailleur

   Shimano 600 front derailleur (1980). A derailleur (French pronunciation:) is a variable-ratio bicycle gearing system consisting of a chain, multiple sprockets of different sizes, and a mechanism to move the chain from one sprocket to another.