Use them on both bikes. 2 oz. in the front 3 oz. in the back. Never had a problem and smooth as glass! Does not have to be exactly weighed out by the way, you aren't baking a cake. Website for them explains it all. Just don't use less than recommened. Simple, fast, efficient and freaking accurate.

 

If the bearing is worn to the point where there is excessive looseness in it. The unbalance phase angle or theoretical heavy spot will always be moving around, or "unstable". The balance machine will not be able acquire a heavy spot phase angle to vector out in its calculation. 20 years ago I use to do this. The balance machines are probably better nowadays and might be able to distinguish between energy from looseness and unbalance, but both are accruing at one times turning speed, so I kind of dought it? Maybe they will even tell you if your phase angle is unstable? Either way the sum or total energy from unbalance and looseness combined is what the machine "feels" if that exceeds some alarm or predetermined level, most likely the machine will express that somehow.

 

Traditionally the valve stem was considered the heavy spot on the rim but that is not always the case...if there is no heavy spot on the rim...then it actually doesn't matter where you put the tire spot in relation to the valve stem....

 

Yeah and if its that bad the guy balancing the wheel would notice it when he throws it on the tire machine to take off the old wheel. If he is really experienced he will notice it coming off the bike. Ain't rocket science.