Join Date: May 2004
Location: Toronto, Canada
As a first guess for mine, I crunched the numbers regarding approximate C of G position and the expected acceleration in 1st gear, and added a couple inches extra to make sure. But ... haven't ridden it like this. I refuse to ride a bike that handles like a school bus, so I'm not going down the excessive lowering route, and I'm certainly not lowering more at the rear than at the front, and I don't want mine any longer than necessary to keep the front wheel down most of the time.
Your proposed gearing gives 22% more acceleration than stock. So my thinking is that if the back wheel is 22% further back from the center of gravity, it will have the same "wheelie-prone-ness" as stock. That works out to somewhere around 5 inches longer, plus whatever extra to keep the front down. Offsetting that, making the C of G lower helps by a couple inches.
I know that with mine, just putting a longer chain to get the axle almost all the way back in the adjuster slots made a large difference. Did that a few years ago.
But now, I'm putting mine at +5 to see what happens. Less lowering than yours.
Helibars, MRA screen, Ohlins damper, reversed shift pattern, sorted suspension, braided lines, Michelin Pilot Power, all else stock 'coz it's fast enough!