I'm currently looking to buy my first mountain bike (first in many years) I have my eye on a older norco 4by looks like a great bike just not to sure about it only having 8 speeds ( may be 9 I forget off hand) I plan on doing mainly light trails/dirt road cruising and maybe the odd heavy trail/ jumping when I can. With that being said does anyone have experience with a gearing setup like this should I be looking for something with more gears? If so would it be possible just to switch out the bottom bracket ( front sprocket) with one that has more sprockets? Not sure how that works Any advise / tips or knowledge on this would be greatly appreciated thanks!