I finally finished my prototype folder. A fairly simple design, really to test the folding mechanism and the geometry. The first version requires the front wheel to be removed to fold it, mainly because it was easier to do it that way. The BB in the rear triangle means there’s no chain issues when folding. 20 inch wheels means it rolls a bit better than my Brommy. I need to put an extra spacer in the frame joint to raise the read a little and have changed the seatpost to one with less layback and suitable amount of seat adjustment. The cable routing seems to work ok with the folding action so far. The next version should enable the front wheel to say in when folding. On the first trip to London found this cool lit bridge with 406 which is coincidentally the tyre size on the bike.