Where do you find a good Mountain Bike Size Chart? You may be surprised at how useful one of these can be. You may think you have to travel out to the bike shop to get this information but you can find it online very easily. The bike size chart can help you pick out a bike that will fit you or your children best and depending on your needs this can help you pick the best bike for your particular type of biking be it heavy duty racing, rough terrain biking, or cross country. Whatever your needs this chart can assist you in finding the right bike for the job.