If i may ask a question that i have wondering about is whats the point of lowering your bike, and wouldn't that give it a ruffer ride?
Two reasons. One is purely cosmetic. I (and others) just don't like to see the big gap between the top of the tire and the fender. I prefer seeing it tucked up. Another is to reduce the reduce seat height. This makes you feel like you're sitting "in" the bike and allows easier leg reach to the ground.
Some might argue it lowers the center of gravity, but in the case of the custom, i feel that's sort of a moot point.
As far as it being a rougher ride, not in my experience. The shock is still as adjustable for a firmer/softer ride as it was before.
The concern with lowering a bike in the rear is whether or not you have enough clearance inside the fender. You don't want to be banging into the fender as you go over bumps.
Keep the Shiny Side Up!
'09 900 Custom SE on the Darkside
"Not all those who wander are lost." J.R.R. Tolkien
I actually just put the 230 on last night and I lowered the rear 2". The 230 tire ends up being about an inch taller overall or 1/2" in ride height. Lowering it will not only look better but lower your center of gravity.
I lowered front & rear of my Classic. Went with Scootworks. For the front I bought the Progressive kit that comes with a Teflon insert which you trim to your liking. I lowered the rear all 3 inches but the 200 tire in the rear takes back about a 1/2 inch. Lowered the front somewhere between 1-and-1/4 to 1-and-1/2.