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2. Crankset - Wikipedia

   en.wikipedia.org/wiki/Crankset

   Cranks designed to mount three chainrings will almost always use two different bolt circle diameters; the larger to mount the two bigger, outer rings and the smaller to mount the smaller, inner ring. Most modern two-chainring cranks use either a 110 or 130 mm (4.3 or 5.1 in) bolt circle diameter. Bolt circle diameters of common cranks:

3. Bicycle chain - Wikipedia

   en.wikipedia.org/wiki/Bicycle_chain

   The chain in use on modern bicycles has a 1 ⁄ 2 inch (12.7 mm) pitch, which is the distance from one pin center to another, ANSI standard #40, where the 4 in "#40" indicates the pitch of the chain in eighths of an inch; and ISO standard 606 (metric) #8, where the 8 indicates the pitch in sixteenths of an inch.

4. Osymetric - Wikipedia

   en.wikipedia.org/wiki/Osymetric

   A crankset with a variable angle Rotor / Cervélo crank and Osymetric chain ring. Osymetric is a French make of ovoid bicycle chainring which has a non-circular shape whose angle is tailored to the pedal stroke of the individual cyclist.

5. Biopace - Wikipedia

   en.wikipedia.org/wiki/Biopace

   Biopace is a tradename for a type of ovoid bicycle chain ring manufactured by Shimano from 1983 to 1993 [1] [2] The design was intended to help overcome the "dead zone" where the crank arms are vertical and riders have little mechanical advantage. [3] Biopace chainrings have a reduced chainring diameter coinciding with the cranks being horizontal.

6. Main bearing - Wikipedia

   en.wikipedia.org/wiki/Main_bearing

   The lower half of the main bearings are typically held in place by 'bearing caps' which are secured to the engine block using bolts. The basic arrangement is for each bearing cap to have two bolts, but some engines may have four or six bolts per bearing cap (often referred to as "four-bolt mains" or "six-bolt mains" engines).

7. Single-speed bicycle - Wikipedia

   en.wikipedia.org/wiki/Single-speed_bicycle

   A great "on road" gear ratio, for the 26″ wheel, is 42:17, approximately a 2.5:1 ratio and 64.2 gear inches for versatile tour riding. Many British enthusiasts used to tour on 27–inch–wheeled lightweights on a single fixed–gear of 69 inches before multi–speed gearing became universally popular, though this certainly made for tough ...