Join Date: May 2009
Location: Wakefield UK
Bikes: Scott road bike, MTB, and Space Genie Folder + several others in bits
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Not all humour has to be slapstick, surely???
In the film, I have deliberately 'faffed about' so that the fold/unfold looks difficult. In reality it is no big deal - I could just as easily make the Brompton fold look difficult if I had one, although in that comment I acknowledge the Brompton is vastly superior to the one in the video.
Its a Mission Space Genie, a cheap knock-off copy of a Brompton of course its rubbish in comparison!
The hole is the diameter of a no. 14 spoke. In fact, the 'pin' is a cut down spoke, bent round at the untapped end and fastened to the bike by a small piece of chain. It has all the benefits you mention, plus I'm able to grease the bar to ease its passage up and down the fold process without suffering from 'sinkage' whilst riding.
I can't comment on whether such a hole would compromise the strength of a 'normal' seatpost. The one on the bike in the video is a solid stainless steel bar and weighs in at 1.5kg (about 3.5lb) on its own so clearly a small hole like that will make absolutely no difference. (The complete bike weighs 14.5kg - 31 lbs - in the state you see in the video)
But before you start... I get fit to be able to ride it fast and don't worry about a couple of kg overweight.