The geometry table for each frame gives a guide to sizing, but people are all shapes and sizes, so this is really only a starting point. It is too difficult for us to make an accurate recommendation as to what the best size bike for someone would be without actually seeing them on the bike. A person’s height is usually a fairly good place to start when determining correct size, however each person’s physical dimensions (arm length, torso length, etc.) are slightly different than the next, so at times it can still be misleading. To determine the final bike/frame size we recommend you to get in touch with a Van Nicholas dealer before committing.