Hello all, Im 16 and just purchased the sigma 1200 wireless. Its very nice. I was very unhappy when i got off my bike and looked at my data. I road mostly flat grounds and rode 12 miles. It took me 1 hour and my average speed was 12.98mph. My max speed going down hill was 25mph. My problem is that i can get to 14mph but cant keep it. What can i do to keep a higher speed?