Nitto Dynamic Stems are cold forged and will fit 26.0mm handlebars and 25.4mm handlebars with a shim - Cold forged - 26.0mm stems will fit 26.0 handlebars and 25.4mm handlebars with shim - Quill Insertion Diameter: 25.4mm for 1 1/8" stems and 22.2 for 1" stems - 45mm range from minimum insertion to max insertion; 78mm from minimum insertion to the top of the quill