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2. Bicycle wheel - Wikipedia

   en.wikipedia.org/wiki/Bicycle_wheel

   Rear wheel of 1960s Bootie Folding Cycle with Sturmey-Archer drum brake. Disc brakes – a disc brake comprises a circular plate or disc attached to the hub which is squeezed between brake pads mounted within a caliper that is fixed to one side of the wheel forks. The brake disc can be attached in a variety of ways using bolts or a central ...

3. Freestyle fixed gear - Wikipedia

   en.wikipedia.org/wiki/Freestyle_fixed_gear

   The fixed connection between rider and wheel enables stunts that are difficult or impossible with a freewheel. [11] The most basic trick called a trackstand is generally done only by riders on fixed-gear bikes. [12] Bicycle messenger culture in the late 20th century and early 21st century is a major influence to freestyle on fixed-gear bikes ...

4. Bicycle gearing - Wikipedia

   en.wikipedia.org/wiki/Bicycle_gearing

   A 700c "standard" wheel has a 622 mm rim diameter. The final wheel diameter depends on the specific tire but will be approximately 622 mm plus twice the tire width. Front/rear measurement only considers the sizes of a chainring and a rear sprocket. Gear inches and metres of development also take the size of the rear wheel into account.

5. Gear inches - Wikipedia

   en.wikipedia.org/wiki/Gear_inches

   For example, a common junior gearing until 2023 was 52 teeth on the largest ring at the crank, and 14 as the heaviest gear available in the rear wheel. [5] Coupled with a 700c wheel (622 mm diameter) and a 23 mm tire size (which approximately adds 2×23 mm to the wheel diameter), this gives an approximate diameter of 0.645 metres (depending on ...

6. 29er (bicycle) - Wikipedia

   en.wikipedia.org/wiki/29er_(bicycle)

   Using the smaller rear wheel allows shorter and quicker handling frames, more options for rear suspension designs and lighter bicycle weight. [23] Another variation is to have a 26″ front wheel with a 29″ rear wheel (commonly called a "69er" though Trek introduced a "69er" in 2007 with a 29″ front wheel and a 26″ rear wheel). [24]

7. List of bicycle types - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_types

   Retro-Direct bicycles have two sprockets on the rear wheel. By back-pedalling, the secondary, usually lower, gear is engaged. Chainless bicycles, either shaft-driven bicycles or belt-driven bicycles use a driveshaft or a belt-drive, respectively, rather than a chain to power the rear wheel.