Have been riding a borrowed bike (a trek carbon, with dura ace's) and I am amazed at how many calories you can burn on an hour's ride!! have had four rides so far a 7 mile/35 min., a 12.2 mile/75 min, and two others about 15.6 miles and 65 min. the last ride I burned a little over 1100 calories. I'm excited about that!
I'm 5' 11" and 206 Lbs. I hope to purchase my own bike very soon(my sit bones hardly hurt now and I don't want to go through that again!) and get into a routine to lose some weight.