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Double-groove Handlebars
From WikiPedalia
Many newer drop handlebars have an indented groove or grooves in the curved section above the brake levers.
- Single-groove handlebars have such a groove along the front edge only, to accommodate the brake cable running from a modern "æro" brake lever.
- Double-groove handlebars have, in addition, a groove on the rear edge of the bar, to accommodate the shift cables from Campagnolo (or Sachs) Ergo shifters. If a double-groove handlebar is used without Ergo shifters, it is a good idea to tape a short length of housing into the groove, or to use a special rubber filler piece made for the purpose.
