For Use With Road Bikes, Mountain Bikes, And Bmx, Bynccea 31.8Mm 70 Degree Perfect Design: Bynccea Bike Stem constructed of precision 3D Forged alloy, to create the strongest, lightest, most secure bicycle adjustable stem available. Adjustable angle: -70~ +70Adjustable Stem can help you raise or lower the height of the handlebar to improve your position or comfort as you ride,so as to obtain a more comfortable riding experience. Compatibility: Only Fit for Handlebar diameter 31.8mm (1-1/4''), front fork stem diameter 28.6mm (1-1/8") and is available in a range of lengths 90mm, 110mm and 145mm. Easy Installation: Just connect up the bike stem riser to original front fork stem. Universal: Suitable for a wide variety of Bikes, MTB mountain bike, road bike, fixed gear bicycle, BMX, etc.