I need a new wheel for my bike. I do not know how to tell what the rim size is. My tire size is 700x23c. It is my back wheel. I tried to have it trued which started breaking the rim. Rim finally broke all the way and is unusable now. I have asked local bicycle shops all they want to do is quote price of rim. I know I can find a cheaper wheel online if I knew what to look for. Any help is appreciated.