Finally Derek Cranage 78 years old British designer has found the way to make a light folding bike which weights just 6 kilos (13,2 pounds, Libras)
His latest creation with 16-inch wheels, incorporates a frame that was designed and built entirely from scratch, with the whole bike folding down into a package measuring 590 x 600 x 260 mm (23.2 x 23.6 x 10.2 in). The three-stage folding process reportedly takes just a few seconds, requiring the flicking of three quick-release levers – no wing nuts or other fasteners are involved.
The mainframe and the coil-spring-suspended rear triangle are made of a mix of carbon fiber, titanium, and 7020 aircraft aluminum tubing, the latter being precisely milled so that it's thicker and stronger at the joints (with a wall thickness of 2.5 mm) and thinner and lighter in the middle of each tube (1.5-mm wall thickness).
The saddle, seat post, forks, and handlebars are all made of carbon fiber. Titanium is used in the bottom bracket, chain, spokes, pedals, suspension spring, and "every nut, bolt, and washer."
The before lightest folding bikes include the 6.7-kg (14.8-lb) Hummingbird and the 8.5-kg (18.75-lb) Ultra X.
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