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Single-speed mountain bike. A single-speed bicycle is a type of bicycle with a single gear ratio and a freewheel mechanism. These bicycles are without derailleur gears, hub gearing or other methods for varying the gear ratio of the bicycle. Adult single-speed bicycles typically have a gear ratio of between 55 and 75 gear inches, depending on ...
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 ...
The rear wheel is subjected to greater stress because more weight is carried on the rear wheel. The rear wheel spokes on the right are more likely to fail. The rear wheels are asymmetrical to make room for multisprocket gear clusters. This asymmetry means that the spokes on the right are twice as tight as those on the left.
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]
Also, if rear brakes are used (essential where a freewheel is used) brake pads may need to be adjusted. The ISO threading for freewheels (Single or Multiple Speed) is the same as for track/fixed cogs. A standard single-speed BMX style freewheel can be used on the track threads of the hub. Because of the stepped down lock ring threads, not as ...
An old-fashioned penny-farthing or ordinary has one high wheel directly driven by the pedals and one small wheel. A dwarf bicycle has a chain-driven front wheel, exemplified by the Kangaroo. On an upright bicycle, also called a safety bicycle, the rider sits astride the saddle. On a recumbent bicycle the rider reclines or lies supine.
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