all four are pretty big factors for me. if i had to rank them:
1. Fun - i love riding a bike!
2. Fitness - i'm not generally inclined towards other kinds of physical activity (other than kayaking which i have no time for these days), so bike community at least gets me off my lazy ass and doing something remotely physical twice a day, everyday. i'm not a "fitness" guy, but i figure that daily bike commuting is still better than my default of doing nothing at all.
3. Money - my bike commuting/transportation cycling helps allow us to remain a one-car family, which is a pretty big savings. we could afford a 2nd car, but i don't want one. i generally dislike cars and view them mainly as necessary evils.
4. Convenience - bike commuting is very convenient. i have good transit options to get to work as well, but the bike allows me to just hop on and go, go, go, which dovetails nicely with my inherent impatience of being tied to someone else's, at times highly unpredictable, schedule (i'm glaring at you, CTA).
Last edited by Steely Dan; 01-17-17 at 04:07 PM.