No actually it won't.
Getting them to all sound the same just implies that they are all at the same tension.
While this will get you in the ball park it tells you nothing about how true the rim is about the lateral or longituninal axis of rotation.
Your welcome to use the your method. I just wouldn't recommend it at 100 mph and I sure wouldn't be recommending it to the public at large.
YOu'll never see the pluck a spoke method in any manual as a way of checking rims.
Hahaha. Let's try this once more.
I wouldn't recommend "checking rims" by plucking a spoke either. Please note that I neither said nor implied that anyone should attempt that. You are correct that it will not work. To true a wheel, as I said, you really need a truing stand of some sort.
Plucking spokes is, however, an accurate measure of spoke tension, except perhaps for the tone deaf. Getting them to the same tone doesn't just imply they are the same, it confirms that they are.
I learned wheelbuilding first as a bicycle mechanic, and there are numerous manuals that recommend plucking spokes as an accurate method for ensuring uniform tension. Among them:
Lennard Zinn: "Zinn and the Art of Road Bike Maintenance" -- I don't have this before me, so I can't quote it, but it recommends plucking spokes in the chapter on wheelbuilding.
Jobst Brandt: "The Bicycle Wheel" -- "Tone is an accurate way to check uniformity."
"Mr. Bike" Sheldon Brown also mentions the method on his Web site.
And there's this from John Allen:
http://www.bikexprt.com/bicycle/tension.htmYes, these are bicycle texts, but you did say the method was not recommended in "any manual." And the theory is the same, although a motorcycle wheel generally will carry much higher tension on its spokes. I always ask the rim manufacturer what is recommended when I do use my tension meter.
Anyway, if your wheels failed at 100mph, it was because you misunderstood the procedure, not because the procedure itself is faulty. I recommend you give it another shot!
And just so this isn't misunderstood: Tensioning spokes is NOT THE SAME THING as truing a wheel. When building a wheel you don't just tighten the spokes and hit the road. Wheels must be trued!