Many people have a simple bike, that they love to ride, but it is the wrong size for them! If you are riding a lot, and many of us are, the fact that many of us are on the wrong size bike, is pretty common.
Find the Right Bike Sizing
Your bike needs to be really sized against your height and your inseam of your legs. Some people have a really tall and long inseam on their body, but a short torso, so it really depends on your measurements what size of frame you should look for.
Here is a great way to measure for your next bike, or to ensure you are riding the right size frame for you!
http://www.road-bike-shop.com/measurement-on-frames/