When New Shocks?

[Fly4hire]

From the numerous posts here exclaiming the virtiues of Ohlins and Works, etc shocks, there is little doubt that handling will improve over OEM. That said the price of the good stuff exceeds my yearly budget for bike maintenance and goodies, so the questions is there any definitive tests that objectively measure the wear and uselfulness of stock shocks as to when they *need* to be replaced vs. it's just a nice to have?

[GordonB]

I'd figure 35,000 - 40,000 miles. some go longer, some shorter.

[keithb]

sent you a PM.