31.8 or 35mm Diameter, Riders Choice 
Features
• 25mm (1in) rise, 31.8mm or 35mm diameter 
• Thicker at the clamping area, tapered down in low-stress sections 
•Cut marks provide a range of width options
• Alignment marks for ease of install and and accurate adjustment
•Textured Grit Grip finish in clamp areas eliminates over-tightening of components