All Jones H-Bars use a 31.8mm stem clamp diameter, 22.2mm clamp size for controls (standard mountain bike style). The entire front loop has a 22.2mm diameter.
The Cut H-Bar has the same hand, stem and brake lever position as the Loop H-Bar but with the front cross bar cut out. The cross bar sweeps forward to allow the levers to go behind the cross bar instead of in front. This gives longer uninterrupted hand positions and will allow trigger and grip/twist shifters to fit on the rearward extensions (unlike the original H-Bar and the Cut H-Bar). The continuous front loop of the bar enhances stiffness and is good for additional aero hand positions and mounting lights, GPS devices etc. This bar provides comfort and power with an impressive weight. With the levers in the optimum position the rider is superbly placed for fast riding while still enjoying all the hand positions available. The rearward extensions allow extra leverage and a wider hand position - be it for comfort or power. All H-bars are for a 31.8 stem and the cross tube is now tapered and butted with a 31.8 mm clamp area. The grip tubes on the aluminum version are also butted for strength, and weight savings.
For setup tips, check out the H-Bar Manual!