Velo Orange Crazy Bar 25.4mm Clamp Diameter 22.2mm Main Bar Ends 23.8mm Horns The bull horns are 23.8mm and fit bar end shifters or reverse brake levers The main grip area is 22.2mm and fits mountain bike grips, flat bar brake levers and shifters 25.4mm clamp area Bull horns are 23.8mm so road levers/bar end shifters fit Main bar is 22.2mm so MTB grips, levers and shifters fit