Comfortable & shaped to fit snugly in the h&, these flat bar grips reduce arm pump to give you better riding comfort & control on long, challenging trail descents. Tech Tip: Although your flat handlebars may be 31.8mm or 35mm at the central stem clamping area, most flat bars have a standard 22.2mm diameter at the ends of the bars. These grips, as with most grips on the market, are designed for bars with this standard 22.2mm measurement at the end of the bars.