Thanks for all your inputs. As for my average cadence ("all day"), its about 70-75rpm. There are 2 things why i was thinking of upgrading my average cadence. I was thinking if spinning more can ease the tension from my left knee. (there's a small pain on my knee if i don't wear any knee support). The other one is, I've read that climbing hills can be a little easier if you're comfortable with a high cadence on flats. (Since I'm always riding on flats... and will want to try climbs now that i have a decent endurance.)