This is THE original Wobblebike. We coined the name in 2000.
I appeared on stage with this bike at the opening event of last years Tour de France - which was televised worldwide.
Step 1: Getting started
Once you have stripped the frame of parts, Cut the down tube nea to the bottom bracket, and the 'top tube' nea to the headset.
Step 2: Building the link tube
Step 3: Rear part of frame
This will be welded into the back of your donor bike. Cut a hole in the top tube of your ladies bike about 6-7" forward of the seat tube. I use a hole-saw to cut the hole. The hole can be at 90 degrees to the top tube, this will usually be at a slightly shallower angle than the set tube.
You can cut off any excess tube just beyond this hole.
You then need a handlebar stem and a bit of frame with a seatpost clamp to make the connector for the seatpost. Assemble the bits roughly and check the heights of the bottom bracket and dropouts are similar to the original bike to enable you cut these bits to the right size.
Weld this post connector up, and the steerer tube with the parts in situ as in the last photo in this step.
Step 4: Finishing the frame
Step 5: Build it & ride
Note that, unlike some Wobblebike designs, this bike can be stripped right down to be painted properly.
You may want to change the angles around and make improvements. we've made 10 of these and the headtube angles change the steering.
We use these to perform at cycling events and in places such as central London.
They fold conveniently and are suprisingly practical. We have used them to haul huge trailers and have riden them as far as 80 miles in a day.