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2. Crankset - Wikipedia

   en.wikipedia.org/wiki/Crankset

   Compact chainrings have been the dominant standard for mountain bike cranks since the mid nineties. In the context of road cycling , compact drivetrain typically refers to double cranksets with a smaller (usually 110 mm (4.3 in)) bolt circle diameter than the standard 130 mm (5.1 in) or Campagnolo's 135 mm (5.3 in).

3. SunTour - Wikipedia

   en.wikipedia.org/wiki/SunTour

   In partnership with Sugino, it introduced the 110/74mm BCD five-bolt triple crankset for mountain bikes, which soon became an industry standard. Next was the introduction of the Micro Drive 94/56mm BCD five-bolt compact mountain bike crankset, which saved weight, increased ground clearance, and permitted lower gearing for hill-climbing. New ...

4. List of bicycle parts - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_parts

   Chainring: (one of the) front gear(s), attached to a crank; Chainset: see Crankset; Chainstay: a pair of tubes on a bicycle frame that runs from the bottom bracket to the rear fork ends; Chain tensioner: a device to maintain proper chain tension; Chaintug: a device to aid in setting the proper chain tension

5. Q factor (bicycles) - Wikipedia

   en.wikipedia.org/wiki/Q_factor_(bicycles)

   Q factor is a function of both the bottom bracket width (axle length) and the cranks. Bottom brackets axles vary in length from 102mm to 127mm. Mountain bike cranks are typically about 20mm wider than road cranks. [6] A larger Q factor (wider tread) will mean less cornering clearance (while pedaling) for the same bottom bracket height and crank ...

6. Bottom bracket - Wikipedia

   en.wikipedia.org/wiki/Bottom_bracket

   The difference between the two can be seen by the depth of mounting grooves on the bottom bracket spindle. v1 spline grooves are 5 mm long, while v2 grooves are 9 mm long. Shimano 105, Ultegra 6500 and Dura Ace 7700 cranksets mate to v1 spindles, while later mountain bike designs use the deeper-grooved v2.

7. Hirth joint - Wikipedia

   en.wikipedia.org/wiki/Hirth_joint

   Specialized's "S-Works" top-level racing mountain bike cranksets use a Hirth joint with a center hex-head threaded rod to secure the crank halves together. [3] The crank design and technology was licensed from Lightning Cycle Dynamics, which utilized and patented a two-piece bicycle crank using the Hirth coupling in 1995. [citation needed]