We have different bicycle frame sizes available. When we are allocating bikes, we will be looking for the correct bike frame size that will suit your height, in order to provide you a comfortable ride. A person 155 cm tall will not be able to ride the same bike frame size as a person 190 cm tall and vice versa, thus the importance of having your exact height. If you don’t know all of your party’s heights, when you first contact us, you can do it at a later time, bearing in mind that you should inquire everyone’s height asap.