"E Meyer" <epmeyer50@msn.com> wrote in message
news:C0EB921E.3807%epmeyer50@msn.com...
> Based on my experience with NTB in Dallas area, its not the tires that are
> impossible to balance, its their balancing technique. Those guys can't
> balance any tire. Seems to be consistent throughout the chain.
> Apparently
> they don't calibrate the machines very often.
>
It may be they are using "bubble-balance" machines. Apparently they worked
pretty well with unbelted bias ply tires, or maybe the profiles were higher
then or the front suspension less sensitive. Anyway, lateral imbalance makes
bubble balance useless these days, but the machines are probably a tiny
fraction of the price of spin balance machines.

If you've ever had a ceiling fan with flimsy blade mounts you've seen the
effects of lateral imbalance. If a blade is not rotating in the same plane
as the others no amount of diddling with weights will correct it.

Mike