Construction
There are two Swift Folder frames, one is low-volume Chromoly manufacturing by Human Powered Machines of Eugene, Oregon, which also makes work bikes and trailers. The other is manufactured from TIG welded aluminium alloy in Taiwan and marketed by Xootr, while the fork is "chromoly" steel. The frame is generally built to common "industry-standard" sizes and threads, and can accommodate a wide variety of gear systems, brakes and other components. The rear fork spacing can accommodate most standard road and mountain bike wheel-hubs.
The Swift Folder is normally fitted with "20 inch" wheels. The standard ISO 5775 wheel size is 406mm (traditionally known as 20x1 to 20x2.125), the same size used on most BMX bicycles. A wide variety of wheels and tires are available in this size.
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