All cranks have Q factor. Q factor is the result of
the pedal not being in the plane of the centre line of
the wheel.
Unicycle.uk.com sell 89mm and 102 mm cranks in budget steel
and also made from cut down Doteks. They also do standard
aluminium alloy cranks in 110 mm.
For these very short lengths, weight is less of a factor.
Also, although aluminium alloy is less dense than steel, you
need a lot more of it to get the same strength.
Aluminium alloy cranks tend to look nicer, but I'm not
convinced there is any benefit in terms of performance.
--
Mikefule - Roland Hope School of Unicycling
Sometimes I ride like a demon, sometimes like a lemon. It's an L of a
difference.
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