Mtb Mountain Bicycle Road City Bike Upanbike Bike Adjustable Stem 31.8Mm 85 ?Size?: Only fit for handlebar diameter:31.8mm (1-1/4'');front fork stem diameter:28.6mm (1-1/8"").Center distance of the two holes:90mm,110mm and 145mm,three lengths for you to choose(PLEASE CONFIRM THE SIZE YOU NEED BEFORE YOUR PURCHASE,THANKS). ?Material?: The stem is manufactured with 6061 T6 aluminum alloy,provide high strength and durable. ?Adjustable Angle?:-85 to + 85 adjust angle.According to your habits,the adjustable stem can help you raise or lower the height of the handlebars,it can improve your position to get a comfortable riding experience. ?Easy to install?: Just connect up the original front fork stem,four bolt bar clamp holds bar securely in position. ?Suitable for Most Bike?: Suited to a wide variety of bicycles,such as MTB bike,road bike and city bike,and also to the different types of riders.