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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.
Want to shift your kids from screens to wheels? Our expert recommends the best kids’ bikes from brands like Cannondale, Cleary, Woom, Specialized, and more.
Although wheel sizes are marketed with measurements in inches, the Michelin TRX introduced in 1975 was marketed in millimeters. For example, 17 × 8.5 × +35 designates a diameter of 17 inches, width of 8.5 inches, and +35 mm positive offset (432 × 216 × +35 in fully metric numbers).
Typical "medium" sizes are 54 or 56 cm (approximately 21.2 or 22 inches) for a European men's racing bicycle or 46 cm (about 18.5 inches) for a men's mountain bike. The wider range of frame geometries that now exist has also led to other methods of measuring frame size. [39] Touring frames tend to be longer, while racing frames are more compact.
Decals are slightly smaller due to the new tubing sizes and were reduced proportionately to suit during the design process. The "Arrow Wedge" design decal carries the number 954917. Although this number bears no relationship on or to the design of the new MK-IV frame, it is carried as a continuation of the prior number carried on the last of ...
Children's bicycles are commonly sized primarily based on wheel diameter rather than seat tube length (along the rider's inseam) dimension. Thus, a wide range of small bike wheels are still found, ranging from 239 mm (9.4 in) diameter to 400 mm (16 in). Smaller wheel sizes are also found on folding bicycles to minimise
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