Thanks, that is definitely one of the best sites I have seen on the
subject.

I located another, that is actually Swedish,
http://www.math.chalmers.se/~olahe/Bike/
There is a third one that simulates suspension movement in graphics
which is quite clever but I can´t locate it at the moment. Perhaps
later.

The last link was interesting to my wife (she's from California) as
she did her graduate studies near Upsala!

We surely got some surprisingly good singletrack around.

Per

http://user.tninet.se/~ipg289h/English.html