A very popular "off road" mountain bike gearing, for the 26" wheel size, is 39:18, approximately a 2:1 gear ratio and 56.35 gear inches, for versatile trail riding. A great "on road" gear ratio, for the 26" wheel, is 42:17, approximately a 2.5:1 ratio and 64.2 gear inches for versatile tour riding. Many British enthusiasts used to tour on 27–inch–wheeled ligtweights on a single fixed–gear of 69 inches before multi–speed gearing became universally popular, though this certainly made for tough work.