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Reducing the weight of the bike + rider by 1 kg would increase speed by 0.01 m/s at 9 m/s on the flat (5 seconds in a 32 km/h (20 mph), 40-kilometre (25 mile) time trial). The same reduction on a 7% grade would be worth 0.04 m/s (90 kg bike + rider) to 0.07 m/s (65 kg bike + rider).
Frame size was traditionally measured along the seat tube from the center of the bottom bracket to the center of the top tube. 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 .
According to trade umbrella body CONEBI, electric bike sales in the EU were over 5 million in 2021, [29] up from 2 million e-bikes in 2016, [28] up from 700,000 in 2010 and 200,000 in 2007. [30] In 2019, the EU implemented a 79.3% protective tariff on imported Chinese e-bikes to protect EU producers. [ 31 ]
a 2007 Filmore, designed for the track, with a head angle that varies from 72.5° to 74° depending on frame size; a 2006 Tete de Course, designed for road racing, with a head angle that varies from 71.25° to 74°, depending on frame size.
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A Triumph with a step-through frame Woman with a step-through frame bicycle in the 1890s. A step-through frame (also known as open frame, drop frame, or low-step frame) is a type of bicycle frame, often used for utility bicycles, with a low or absent top tube or cross-bar.