Do you know if the bike is the right size for you? I am new to the sport as well but it doesn't take long to learn how important fit is. Fitting means a lot more than standing over the bike. I got my first bike off CL as well. I knew I needed a 58cm bike, but I had to have a few adjustments done (stem, saddle height, saddle position) before it was perfect for me. The shop charged me $40 but is was worth it.