The Center of Gravity on our sportbikes are set high for the better manueverability. If you lower your bike this compromises the ability for the bike to turn around quicker. Plus you might bottom out your shit.
Basically the angle of the headstock in relation to street determines how fast the bike turns. If the forks/triples/headstock are around 25 degrees (from vertical) you get your typical sporty handling. When you lower the rear it increases the angle, which slows the steering. That simple. One degree makes a lot of difference.
So if you lower rear and front the same, theoretically the bike handles the same. Then you run into problems with bottoming out and the front end slamming fender into fairing on braking. Bettah to leave the ride height stock if you can.
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