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2. Bicycle wheel - Wikipedia

   en.wikipedia.org/wiki/Bicycle_wheel

   These range from 16-inch diameter (e.g. Brompton) through 20 inches (e.g. Bike Friday) up to even 26 inches. Wheel rims also come in a variety of widths to provide optimum performance for different uses. High performance road racing rims are narrow, 18 mm or so. Wider touring or durable off-road tires require rims of 24 mm wide or more. [42]

3. 29er (bicycle) - Wikipedia

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

   29er (bicycle) 29ers or two-niners are mountain bikes and hybrid bikes that are built to use 700c or 622 mm ISO (inside rim diameter) wheels, commonly called 29″ wheels. [1] Most mountain bikes once used ISO 559 mm wheels, commonly called 26″ wheels. The ISO 622 mm wheel is typically also used for road-racing, trekking, cyclo-cross, touring ...

4. List of bicycle types - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_types

   A lugged steel bicycle has a frame made of steel. A plastic bicycle was an attempt in the early 1980s to introduce a bicycle made entirely out of plastic materials instead of metal. A wooden bicycle has a frame made out of wood. One example is the Chukudu used in the east of the Democratic Republic of Congo.

5. Wheel sizing - Wikipedia

   en.wikipedia.org/wiki/Wheel_sizing

   The wheel size is the size designation of a wheel given by its diameter, width, and offset. The diameter of the wheel is the diameter of the cylindrical surface on which the tire bead rides. The width is the inside distance between the bead seat faces. The offset is the distance from the wheel's true centerline (half the width) to the wheel's ...

6. ISO 5775 - Wikipedia

   en.wikipedia.org/wiki/ISO_5775

   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.

7. Magnesium wheels - Wikipedia

   en.wikipedia.org/wiki/Magnesium_wheels

   Magnesium is the lightest metallic structural material available. [1] It is 1.5 times less dense than aluminium, so magnesium wheels can be designed to be significantly lighter than aluminium alloy wheels, while exhibiting comparable strength. Many competitive racing wheels are made of magnesium alloy. [2]