An average speed can vary considerably, depending on the bike and other things like tires.
IF I put "tractor type" knobbies on my grocery getter, I have trouble getting up to 10 MPH. Skinny street slicks and I average about 14ish.
Spin at a comfortable pace. You can always push it when you get close to home if you desire.
Last edited by Bill Kapaun; 03-08-12 at 04:26 PM.