I'm 32 and looking to start riding again to get back into shap after 10 years off. I'm still torn between an "adult" sized bike or a 20" like I used to ride. As I've been looking around at bikes on the net though, I noticed a lot of bikes with tiny chainwheels.
All though my teens and early 20's I rode a GT Pro Performer and later a Haro Sport. Back then, IIRC most bikes had a 44t in the front and a 16t in the back or something close to that. The dirt/street/flatland bikes I see now though have these little tiny chainwheels. I suppose as long as you shrink the rear along with the front you still end up with a similar gear ratio, but I don't quite understand why riders/manufacturers chose to start doing this. Like I said, I've been out of the loop for a LONG time. Maybe someone can enlighten me.