DCLane
Found in the Yorkshire hills ...
The C5 wasn't ahead of it's time. Sinclair (rather arrogantly in my view) never bothered to research what was then occuring in the bicycle/human power world before designing his monstrous sh!tter.
Ah - but he does have the highest IQ in Britain: http://www.docsford.com/document/140365
Last year some of the Fridays were joined on tour for a day by three of these. People admired them, and I might be sticking my neck out a bit here, but on the segregated cyclepaths I found them a bit of a pain to ride with in a group. Fast, a bit inflexible about positioning, and rather nerve-wracking to be around I thought.
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They're fun-looking and fast on flat/downhill but I'd not want to be in a group with one.