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The Birdy uses 18 inch (355mm ETRTO) wheels. This allows for a compact folded size but makes finding replacement wheels, tubes and tires more difficult. Gears and brake components are standard. But the availability of some spare parts for the Birdy is rare, even in places in which sell folding bicycles, due to their unique design.
A clincher bicycle tire mounted on a wheel A cross section of a clincher tire with a puncture-preventing layer (in blue) between the casing and the tread An inner tube rolled up for storage or to be carried as a spare. A bicycle tire is a tire that fits on the wheel of a bicycle or similar vehicle.
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.
The result is the equivalent diameter of a penny-farthing wheel. A 60-inch gear, the largest practicable size for a high-wheeler, is nowadays a middle gear of a utility bicycle, while top gears on many exceed 100 inches. There was at least one 64-inch (1.6 m) Columbia made in the mid-1880s, [48] but 60 was the largest in regular production.
Bicycle racers seeking the greatest saddle-to-handlebar drop for better aerodynamics will often forego spacers and cut the steerer tube down to exactly match the headset bearing cup stack height plus the stem height. Cutting the steerer tube to its minimum length prevents switching to a taller stem or to a headset cups with a higher stack height.
The top tube, [18] or cross-bar, [19] connects the top of the head tube to the top of the seat tube. In a traditional-geometry diamond frame, the top tube is horizontal (parallel to the ground). In a compact-geometry frame, the top tube is normally sloped downward toward the seat tube for additional standover clearance.