A Shimano Flight Deck handlebar clamp for wireless head works as a tall clamp-on peg for round (not oval) tubing. One should use 2 if one needs a pair of pump pegs. The distance from the tubing surface to the pump axis will be about 1-1/8 in. (28.6 mm), in contrast to the 3/4 in. (19.1 mm) distance one would get with brazed-on pump pegs. One should install the screw and nut at the tip of a clamp with the screw point protruding to make a peg that fits the hose-attachment hole of a traditional pump (such as a Zefal Lapize pump or a Sunlite Bicycle Frame Pump) or fits the handle dimple of a Topeak Road Master Blaster pump. One should install the screw and nut with the screw head protruding to make a peg that fits the Schrader-valve-attachment fitting that is at the handle end of a traditional pump (when a Schrader-valve hose is stored in the pump handle) or fits the head dimple of a Topeak Road Master Blaster pump. One should use a protruding screw point or a protruding screw head, whichever works best, to fit the handle dimple or head dimple of a Zeval Rev 88 pump.
This is the handlebar clamp for the wireless head, not the fork clamp for the wireless sensor.
The 26.0 mm version of the clamp works for tubing with o.d. of 0.94 - 1.04 in (24 - 26.4 mm). Smaller tubing must be shimmed.
I guess the 31.8 mm (1-1/4 in.) version of the clamp works for tubing with o.d. of (29.8 - 32.2 mm), and smaller tubing (such as 1-1/8 in. (28.6 mm) tubing) must be shimmed.