Originally Posted by The_Aleman
A shift kit doesn't increase your theoretical top speed, it can actually lower it because of added drivetrain losses.
That said, you should be able to hit 35, maybe even 40 with a shift kit depending on your bike's gearing.
Listen to this man. Shift kits do not make your bike faster.
And, what does the fact that your bike has disc brakes have to do with using a shift kit?