hey led - Im being a helpful smartass but no way insulting. Its my job.
fwiw, I was noting / complimenting your screen name but I don't usually do the hold-your-hand-and-stroke-the-back-of-it method. Where would even get the notion that I was dissing led zep, pink floyd or 18years old ? All those things have been very useful to me. If it will set us back arights, here goes "you are certainly a fine young man with notable interests and many great accomplishments. But Hell no you cant date my daughter."
And I enjoyed writing my little screed ; the pay for posting here is too low to bother polish it, but if you read a paragraph at a time, and don't mind jumpy subject matter, maybe theres something there. maybe not.
I asked YOU if 1/2 oz is a lot; I never balanced a car tire. I see 9494 chimed in on that. thanks for the input.
The only subtle thing I think was to bring up the tire truing machine, seems like there is more need for that kind of service , especially with big fat tires subjected to much abuse. It fixed $800 of bad tire on one of my other rides.
As far as vibration sources, out-of-round should be as bad as out-of-balance, even if the balance job hides that. Out of round would be one source of out-of-balance, Think about it.
You can weight the tire to disguise the balance issue, but that does not fix the round issue.
Now whether a roundness issue can overcome suspension dampening to the point you can feel it, how bad and at what speed, thats a whole nuther can of worms.
I noted that I've never put a dial indicator on a drive shaft after work like u joint replacement but it sounded like a great idea. Thinking out loud. I suggested a way to mimic drive line balance issues would be to CAUSE out of balance (band clamp some weights on the shaft and go for a drive) just to see what it feels like. I bet I would feel it in my seat or feet but not the steering wheel.
SO is it tires or driveline ? one clue is the frequency; the shaft turns about 3~4 times faster than the road wheels, so if you have a feel for the frequency of the vibration , that could be useful info. Any body paying homage to Pink & Zep should have a good feel for frequencies. BUt to make things worse, a couple tires out of balance could produce a beat higher than a single tires rotational frequency, but that would come and go as the culprit tires move in and out of synch with e/other.
and lastly - Pet Sounds is a landmark Beachboys album, and not a poof piece by any means . Good Vibrations was a track produced during those sessions but not included on that album, totally ruining a lame joke 50 years later. ah the www we weave ...