Hi J,
I actually worked up a spreadsheet a while ago to calculate all of this, below are the highlights. Before I get to that, my 'seat of the pants' accelerometer suggests you won't begrudge the switch to higher gearing as its still got a good bit of snap to it. Unless you're drag racing it (and why would you) anything you lose on the launch you're going to make up for by going faster in a lower gear. FWIW - I'm so used to it now that the stock Ascot feels almost ridiculously low-geared anymore.
The Ascot has a final drive ratio of 3.35 with a rear wheel diameter of 26.6"
The Shadow has a final drive ratio of 2.94 with a rear wheel diameter of 25.4"
Stock, the Ascot revs ~5,800 at 80mph, with the Shadow's 2.94 hub it brings revs down to ~5,100.
Switching this around, calculated speeds at 5,100 rpm are as follows:
Stock Ascot = 70.51 mph
Stock Shadow = 76.72 mph
Ascot wheel with Shadow hub = 80.34 mph
(and just to be silly - say you wanted the best setup for burnouts & wheelies
)
Shadow wheel with Ascot hub = 67.33 mph
Cheers,
Bill