Like the Box One™ Chromoly handlebars, Flat Chromoly bars are super stiff and custom made from the highest quality 4130 chrome-molybdenum. They feature a proprietary 13-butted taper from 22.2 Ø at the grip area to 31.8 Ø across the clamp area. The incredible stiffness of the 31.8 oversize bar improves bike handling while putting more power into your pedal stroke. Flat Chromoly bars, however, have a very flat 3-degree back sweep. Weight Limit: 115kg (253 lbs) with limitations as per Category 2 of EN 16054:2012 Standard