rBOB who? wrote:
Are you sure it's coming from the spokes?...

There is enough deflection when corning in many trikes to make the
discs rub slightly (if said trike is disc brake equipped, of course).
This is more of a "ringing" sound [1] than a pinging sound, however.

[1] My Earth Cycles Dragonflyer [TM] trike exhibits this behavior.
--
Tom Sherman - Fox River Valley