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Small-wheel bicycles are adult bicycles that have wheels of 510 mm (20 in) nominal diameter or less, which is smaller than the 700c (522 mm), 660, 700, 740 mm (26, 27.5, 29 in) sizes common on most full-sized adult bikes. While many folding bicycles are small-wheel bicycles, not
The Raleigh "Twenty" was originally fitted with 20" × 1-3/8" wheels and tyres (ISO 35-451), but most export versions were sold with 20" × 1.75" wheels and tyres (ISO 47-406) – the same as BMX bicycles. Many were sold as either single speed with coaster brake or fitted with a Sturmey-Archer AW three-speed hub. The New-Zealand-manufactured ...
Two-wheeled walker: Similar to a standard walker, a two-wheeled walker has two front wheels for easier maneuverability. It's best if you can partially support your weight and have good balance.
This page lists notable bicycle brands and manufacturing companies past and present. For bicycle parts, see List of bicycle part manufacturing companies.. Many bicycle brands do not manufacture their own product, but rather import and re-brand bikes manufactured by others (e.g., Nishiki), sometimes designing the bike, specifying the equipment, and providing quality control.
The first walker to resemble modern walkers was patented in 1970 by Alfred A. Smith of Van Nuys, California. [5] In 2023, designs for the first open source walker were released after testing that could be digitally-replicated with a low-cost 3D printer , customized and reduced mass by 20%.
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