Well it kind of sounds like maybe hes just pushing me harder. (showing off)LOL. So I guess its not the wheel size and Id probably better just give up on that excuse and start riding harder. I probably need to make a trip to LBS to have them check it all over. I love both bikes but its so much more fun to ride faster on the pavement. Mountain bike just didnt roll well. We have noticed about 3-4 mph average faster than on the mountain bikes and its alot easier with the road bikes. Bought the bikes on Friday night and Saturday rode 34 miles, Sunday 15 miles. Thanks for everyones info.