I've been riding mainly by myself for about 3 weeks. I have a Trek 1000, 05 model and I rode with a club for the first time this past Sat and did 40 miles and on every hill I fell behind. I had to have the guy behind me push me with a hand on my back when ever I fell behind mainly on hills or behind on Drafting. I was able to keep up on Flat surfaces. I didn't have all the gear which I just purchased, Shoes and Cleats, and cycling shorts and shirt. I wanted to know the diffrence between an 8 speed, 9 speed and 10 speed? What was the main reason I fell behind on hills? Was it cause of the shoes and cleats and having an 8 speed bike?