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Check the one piece cranks on bikes for small children for shorter arm length. The aero drag on an non faired recumbent may be the same as that of a racing tuck upright. I just received my 13T/16T gears cut to mount on a S-A 3spd hub in a 26" wheel; with a 40/50T chain ring the bike is capable of 35 mph at 90 ppm.
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