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Grip shifter - a wheel with click stops surrounding the handlebar is turned until the desired gear is reached, though typically one gear at a time; Trigger shifter - a lever is pulled or pushed to change gears one at a time; Thumb shifter; Road bike shifter - integrated with brake levers, sometimes known as a "brifter". [2]
Brake shifter or colloquially, brifter (see also Shimano Total Integration, Campagnolo ErgoPower and SRAM Double Tap): combined shifter and brake lever control Braze-on : a fitting protruding from a frame to provide attachment, typically for cable housings or tire pumps and similar accessories
Both quill and threadless stems come in a variety of bicycle handlebar clamp diameters. The ISO standard for the clamping area of a handlebar is 25.4 mm (1 inch), which is used on mountain bikes and many Japanese-made road handlebars. However, the Italian unofficial standard is 26.0 mm, which is the most common clamp size for road bars.
Standard road drop handlebars (including track, cyclocross and touring bars) use a 23.8 mm (15 ⁄ 16 in) grip/lever diameter, which is matched only to road bike type shifters or brake levers. This diameter is usually not important for grips since these bars most often are wrapped in tape.
SRAM Double Tap shifter and brake lever. SRAM Double Tap is an integrated gearshift and brake lever system designed by SRAM Corporation for racing bicycles. [1] It allows shifting gears without having to remove a hand from the bars, unlike previous down tube shifting systems.
Modern front and rear derailleurs typically consist of a moveable chain-guide that is operated remotely by a Bowden cable attached to a shifter mounted on the down tube, handlebar stem, or handlebar. A shifter may be a single lever, or a pair of levers, or a twist grip ; some shifters may be incorporated with brake levers into a single unit.