We designed our Speed Clamps to solve speedo mounting challenges on motorcycles equipped with our Tyson, Tyson XL, H2 and RE-bar, or with Murdock risers. One 5/16-18 t.p.i. Allen cap screw on each hinge secures the Speed Clamp around the 1-inch or 1-1/4-inch O.D. bars or riser uprights to give you a place to mount stock and select aftermarket speedo assemblies.