Tank slap ?

[theoneandonly]

An unbalanced wheel will go in and out of phase, therefore vibration will come in, then go as you speed up until it reaches the next octave, as it were - unless of course it's so badly buckled it just goes into self destruct!

yeah ?
in my experience , once the out of balance comes into play , it is there until you reduce your speed . then it goes away ... until next time .

 

[Slipperyeel]

yeah ?
in my experience , once the out of balance comes into play , it is there until you reduce your speed . then it goes away ... until next time .

Yea, definitely.

The issue can often be though, the next 'octave' is way above the limit

Many moons ago after having a set of new tyres on my Pan European, the idiot made a really bum job of balancing the front wheel. Soon, on my ride into France, the dreaded vibration came in. Stopped to try and see what it was. Experimented while riding and quickly discovered I could 'break through' the vibration into smooth territory, only for it to begin a come back at around 125mph!
More recently twin cam had radial run out on my front wheel, which brought in vibration at exactly 127kmh. It would fade and disappear around 137kmh and I found i could bring it back at a tad over 160kmh.

So yea, I stand by my comment

As an aside, I ended up fixing my own wheel and re-trued it. I've done my rear wheel also. The bike is super smooth now. Have done 4 sets of wheels now for others

 

[botus]

wheel balance doesn't really factor till going faster than the wobble zone mentioned in the first post

static balance, up and down forces usually rears its head between 58 and 66 mph
dynamic balance, side to side wobble of the wheel comes in around 79 to 86 mph

big boy bike tyre manufactures don't believe dynamic balance is a thing for bikers - and as of a few years back even with super wide rears they didn't bother with dynamic balancing for racing - not that I agree - even your single sided rear on a GS is usually dynamically balanced because its wheel design means its easier to fit on the car balance machine

 

[Guru Gora]

Too many variables here.

Demand a new bike, nothing less