Hi, Bernard, Dirk, and Paul in my green python the center pivot is in line with the wheel axles and it works pretty good, yet I want to compare it to Jürgen´s python, once we will meet on a lonely road changing our bikes. To drive a python backwards I can not imagine. There exists a page in the net, where lean steered drive has been tried, but without much success. With three wheels this is possible. I agree with Dirk´s explanation, the trailer force of the legs keeps the python in line. Hi Paul, I want you to encourage to build a 20 '' python. Take it as a prototype, as I did with my first python. A long leverarm with the feet is advantage I believe. So today I did the next 20 km training on my green python, and I love it and I am very happy. I don´t use the scaterollers any more. I managed to start without them. The start is the most difficult, and it is easier when the road goes a little bit downhill. Uphill starting does not yet work. The arms I use for balance (and feeling the grass passing the hands) :-). I found out that when the snake is going suddenly to the left I have to lean even more to the left side, this stabilizes the beast. This feels like falling down now completely, but the opposite happens. The same I have to do in curves. Very new movements and I begin to love them. Greetings Jürgen from Giebelstadt ============================================================ This is the Python Mailinglist at freelists.org Listmaster: Juergen Mages jmages@xxxxxx ============================================================