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  2. ISO 5775 - Wikipedia

    en.wikipedia.org/wiki/ISO_5775

    ISO 5775 is an international standard for labeling the size of bicycle tires and rims. The system used was originally developed by the European Tyre and Rim Technical Organisation (ETRTO). It is designed to make tire sizing consistent and clear. It replaces overlapping informal systems that ambiguously distinguished between sizes.

  3. Gear inches - Wikipedia

    en.wikipedia.org/wiki/Gear_inches

    This is equivalent to doubling the size of the drive wheel; that is, it is like a directly driven bicycle with a 52-inch wheel. That gear is said to be "52 gear inches." A bicycle with a 26-inch wheel, a 48-tooth chainring, and a cassette with gears ranging from 11 to 34 teeth has a lowest gear of 26 × 48 / 34 = 37 gear inches and a highest ...

  4. Bicycle and motorcycle geometry - Wikipedia

    en.wikipedia.org/wiki/Bicycle_and_motorcycle...

    a 2006 Tete de Course, designed for road racing, with a head angle that varies from 71.25° to 74°, depending on frame size. Due to front fork suspension, modern mountain bikes —as opposed to road bikes —tend to have slacker head tube angles, generally around 70°, although they can be as low as 62° (depending on frame geometry setting).

  5. Road bicycle - Wikipedia

    en.wikipedia.org/wiki/Road_bicycle

    A flat bar road bike, also called a fitness bike, is a relatively new style of bicycle. It is simply a road bike fitted with a flat handlebar and MTB-style shifters and brake levers. [4] [5] This combination provides a light, fast bike with a more upright riding position that is more comfortable and gives a better view in traffic. Flat bar road ...

  6. 29er (bicycle) - Wikipedia

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

    In the early 1980s, the size of the wheels for the emerging mountain bikes was undecided. So when English off-road cycling pioneer Geoff Apps contacted Gary Fisher and Charlie Kelly with news that he had built a prototype off-road bicycle that used large-diameter 28 × 1¾ (ISO 47-622), 47mm wide Nokian Hakkapeliitta snow tires from Finland ...

  7. Comparison of hub gears - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_hub_gears

    e-bike Shimano Nexus 4 Speed 4 184% 1st gear City Shimano Nexus Inter-3: 3 187% 2nd gear 1220 g City SRAM Spectro E12 (Elan) 1995 1999 12 339% 3500-4000 g City SRAM i-Motion 9: 2005 2012 9 340% 2000g (w/o brake)-2400g (with coaster brake) City SRAM G8: 2012 2015 8 260% 2088-2180 g [16] [17] City SRAM G9 2014 2015 9 292% 2088 g [17] City, Sport

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