On a stock bike yes...I can hit 30 in first gear easy...if you have aftermaket pipes/jet kit/sprockets..your shifting will change...it's just like a car you will learn to shift by feel and sound of your bike..
Really?? It's probably because the aftermarket exhaust. I never rode the bike with stock exhaust so I went by ear and by owners manual even though the manual has you shifting every 10 km/h.
(12, 19, 25, 31-mph)