Hey, I'm stronger than I thought! I managed to lift my bike onto the top of my plastic garbage can! : ) I looked at the numbers...there are 3 rows of numbers! I wish I had brought them to the office this morning, so I could tell you what they are and then you can tell me which one is the Serial #! Anyway, I am excited that I am getting stronger through riding! This is so fun! Thanks everyone for your good advice. You have no idea how much you have helped me.