It´s good that Dirk brought back the gyro effect into discussion.
The flevoracer was reported to have "strange high speed behaviour" once it had 28" wheels. Therefore the company changed the wheelsize to 26" thus solving the problem.
Not knowing exactly what happened, one could presume that the stronger gyro force lead to a scary feeling at higher speeds.
When I find the time I will wrap the spokes of my front wheel with lead tape (the ones, used in curtains) and make some experiments.
http://www.gyroscopes.org/math.asp
is a good site that calculates various aspects of gyro force.
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