Great idea and I am sure it would be fun to take it to another level.
For me plunking the spokes is part of my "Pre-Flight Check List". Its not so much the specific sound of each individual spoke but rather the change in sound that gets my attention. I kinda have it in my head how each bikes wheel set sounds. I air the tires then give the wheel a spin holding a chop stick to the middle of the spokes and listening first on one side then the other. Each one of my bikes has a different wheel set, tires, spoke types and age. Trying to nail down a specific frequency's for each wheel and wheel set would be a little to much for me. It would be like having different instruments. A Guitar and a Banjo may be tuned to the same frequency but have very much different tensions on the strings.
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)