the main frame tube, on the Mk4 is 60cm long, centers of seat and steering mast tubes..
My Mk 2 I used a SAP , pointed backwards to get my self comfortable, I did not need it with the new frame..
rear wheel, folded under, just touches the back of the front mudguard with the front wheel straight..
the Mk 2 I had to have the wheel turned to the side, for a rear fold.
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