Originally Posted by thump!
The calculator deals with the primary drive ratio change that was made with the '94 model.
The calculator bases everything off of a reading of indicated speed and indicated rpm from the creator of the calculator (ie. 5300 rpm in 6th at 60mph on a specific brand of tire). Everything else is a % of that single reading, so there is a great deal of variability that could be had.
Use it as an approximation only, though most readings should be reasonably close (ie +/- 500rpm).
There also appears to be one insignificant error - while the calculator deals with the primary ratio change, at least in comparison to my 95 SE the first gear ratio in the 94+ column is wrong. According to my manual it didn't change from the earlier bikes.