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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.

  3. Tire code - Wikipedia

    en.wikipedia.org/wiki/Tire_code

    R – this is a radial tire; 16 – this tire fits 16 in (410 mm) rims; 85 – the load index, a maximum of 515 kg (1,135 lb) per tire in this case; H – the speed index, this means the maximum permitted speed, here 210 km/h (130 mph) The tires on a Hummer H1 might be labeled: 37X12.5R17LT. 37 – the tire is 37 in (940 mm) in diameter

  4. Gear inches - Wikipedia

    en.wikipedia.org/wiki/Gear_inches

    For bicycles with 700c wheels, some cyclists quote gear inches based on a nominal wheel diameter of 27 inches, corresponding to the old British tire size of 27 x 1 + 1 ⁄ 4" (ETRTO 630). Strictly speaking, the rolling diameter of a 700c wheel may be significantly higher or lower than 27", depending on the tire size, e.g. nearly 27.5" for a ...

  5. Bicycle tire - Wikipedia

    en.wikipedia.org/wiki/Bicycle_tire

    A bicycle tire is a tire that fits on the wheel of a bicycle or similar vehicle. These tires may also be used on tricycles, wheelchairs , and handcycles , frequently for racing . Bicycle tires provide an important source of suspension , generate the lateral forces necessary for balancing and turning , and generate the longitudinal forces ...

  6. Bicycle gearing - Wikipedia

    en.wikipedia.org/wiki/Bicycle_gearing

    There are three chainrings with half-step differences between the larger two and multi-range differences between the smaller two, e.g. chainrings 24-42-46 and cogset 12-14-16-18-21-24-28-32-36. [12] This general arrangement is suitable for touring with most gear changes being made using the rear derailleur and occasional fine tuning using the ...

  7. Wheel sizing - Wikipedia

    en.wikipedia.org/wiki/Wheel_sizing

    Example of tire sizing on an all-terrain vehicle. Modern road tires have several measurements associated with their size as specified by tire codes like 225/70R14. The first number in the code (e.g., "225") represents the nominal tire width in millimeters. This is followed by the aspect ratio (e.g.,"70"), which is the height of the sidewall ...

  8. Bicycle wheel - Wikipedia

    en.wikipedia.org/wiki/Bicycle_wheel

    24-inch clincher tires (with inner tubes) are the most common wheel size for junior mountain bikes. The typical 24-inch rim has a diameter of 507 millimetres (20.0 in) and an outside tire diameter of about 24 inches (610 mm).

  9. 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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