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@DFP
Tyre flys are activated by shock, so its on most of the time I am riding. Even in the day.
I bought a boxful of batteries in anticipation of the batteries running out, but ive had it on all winter and its still going strong!
With your method it might be interesting to have a few different colours positioned at different lengths of the spoke.
That way you would get several circles of varying diameters?
Fun for a group ride/race?