The System Ex Adjustable Stem. Awonderfully impressive with its powers to adjust from a zero degree rise through to a 60 degrees rise. The stem gets you riding in the right position for you and with cold forged and heat treated aluminium power, you can enjoy it for a very long time. System Ex Adjustable Stem Features Secure and easily adjustable Cold forged and heat treated 6061 aluminium alloy Compatible with handlebar size: 25.4mm and 31.8mm Adjusts through to 60 degrees Ahead: 1 1/8 inch Weight: 272g