Trick Wheel Balancing

[Ergos <ergos@xxxxxxxxx>]

Duane recommends the Hunter GSP 9700 to Garrick.

While it's a beautiful machine, it does not really deliver a much
better balancing. There are two main reasons for that.
Low speed radial force variation (RFV) is not correlated with medium
and high speed RFV, which is the one that's annoying to a driver. The
reason is that low speed RFV is linked to static properties of the
tire, whereas high-speed RFV is obviously dynamic. OTH, low speed RFV
is very correlated with mass unbalance - because mass unbalance
typically is linked to the one spot on the tire circumference where
the tread joint was made, which also tends to be the place where
static force variation occurs (likerolling over a small step).
Second, the Hunter uses a small drum to measure RFV. the contact patch
of a tire on these drums is very different from that on plane ground,
and the resulting forces also differ...

Bottom line: this very fancy machine delivers a slightly better static
balancing... that's all. Tires with high dynamic RFV are very
difficult to correct, regardless of the machine used.




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