If you are passing roadies with knobby tires, you may want to get off the park bike path and find some real ones on the road. I've never seen a mountain biker keep up on a club ride on the road. They always get dropped within the first half mile. Mountain bikes are great, don't get me wrong, but they aren't the right weapon for the road to compare yourself to other riders. By the way, I'm not a roadie. I'm on a racing recumbent, but in this case I feel the need to defend the poor roadie.