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Hello Vi, I do doubt very much that the self centering graphs produced from my program are very useful. Seat rise is only part of the thruth. I tried the other end of the pivot angle scala: 70degrees and 80degrees, and they were not very good - it was distinctly difficult to turn the bike. It was difficult to overcome the seat rise, even though the seat rise for these angles is less than with a 60degrees pivot. There were as far as I can see two reasons for this worse turning behaviour: * What the program does not deal with is forces. When turning, the seat rise is counteracted by the front part (+legs+feet) weighing down. In 70 or 80degrees there was not enough mass falling over to get my body up. * On 80degrees the ergonomics of turning got worse. Trying to swing sideways with the legs is just not something the human body is made for. I can see that 70degrees is in use by other python riders, I can only assume that these work because they are short bikes and thus do not have to swing as much to do the same turn. You say 48 degrees is bad, would bei interesting to see what 55degrees does ;-) Dirk On 16.03.2011 05:08, Vi Vuong wrote:
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