> 
> I have a pretty badly damaged (steel) rim -- a nice, deep 
> dent, about 10 cm
> -- and would like to get an idea of the speed involved in the event.


Not sure about steel (whatever type of wheel you have) but I can tell
you that if you ride a small (250cc) motorcycle with magnesium wheel
into a gutter at about 30-40km/h, you'll get half a front wheel and lots
of little bits.

Tony

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