Originally Posted by Dave Mayer

Ummm... bicycles are simple machines, and the behaviour of index shifting is easy to predict. I do all forms of unholy mixing & matching of indexing systems, and I find that physical testing not required to determine if a combination of shifter, cogset and derailleur will work correctly together. But you do need to have very accurate numbers for each of the drivetrain components.

For the shifters you need how much cable the shifter pulls per cog (A). Then you need the mechanical advantage of the rear derailleur (B). That is, how much distance the derailleur travels laterally across the cogs for each unit of cable pull sent to it by the shifter. Then you need to know the spacing of the cogs (C). If A x B = C (to within about 0.2mm per cog), then you're in business. I have never had this calculation fail to produce great shifting.

Fortunately, the necessary numbers are archived on the CTC website. Suntour Accushift derailleur mechanical advantage is about 1.83:1 (same as pre 9-speed Dura-Ace); that is the only remaining number that you need.