The Surly Corner Bar is for off-road riders who want to give drop bars a try without swapping out the drivetrain and brake levers on their current mountain setup. Does that make it an economical option for fresh excitement on the trail? Yes, it does. - Chromoly steel with custom-butted tubing - 22.2mm grip diameter - 25.4mm clamp diameter - One set of 25.4/31.8 x 60mm Problem Solvers shims included