Post Master General
Join Date: Apr 2012
Location: Bowling Green, VA
I Ride: '09 ZX6R
Lowering the rear of the chassis 2.5" will change the angle of the fork some, which will increase rake. Instead of the fork being 25 degrees from vertical (very, very steep) it would become less vertical. The fork angle would be something like 27+ degrees. This will make the steering ever so slightly slower and heavier.
Most of the street bikes I rode which were not based on racing platforms had steering with fork angles at this sort of value. I have put 10s of thousands of miles on bikes with 35 degrees of rake. Easily, 120,000 miles. I expect you would have trouble noticing a difference, tbh. At least until you were to start riding on a track. Slower, higher effort magnified by the narrow clip on handle bars.
Using links to alter the rear suspension geometry changes the leverage ratio applied to the shock and spring. That will change ride quality, which will affect handling. Again, if you only ride on the street that may be something you can adjust to. I expect the ride quality at the back to be more harsh, as you are taking away more than half the distance the wheel was designed to travel. Sort of similar to what happens when you have a passenger. The extra weight compresses the rear suspension more than the front.......
Make just the one change, and gather experience with it. The best thing about links is you can just as easily remove them. If you like the result you could modify the forks at a later point.
I caution you about pulling the forks up through the triple clamps. Do that as a last resort. Very easy to make a sweet handling thoroughbred into a vicious killer. The bike is already very close to the limit of how vertical the fork can be. Chassis attitude changes making the steering more vertical usually involve placing a shim on top of the shock to tip the back of the chassis higher, all of 10mm or so.
You're starting out by going much further in the other direction.
"Basic stuff fellas. Use your head for something other than to break your next fall."