Bar end
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In cycling, bar ends are extensions at the ends of the handlebars. Usually fitted onto mountain bikes with straight handlebars, they extend away from the handlebars and allow the rider to vary the type of grip and posture that they use during a ride. They are especially effective when climbing out of the saddle, because they increase leverage. Bar ends can also improve comfort for the rider due to the neutral position of the hands (palms inward) which places marginally less stress upon the musculature.
Bar ends were very popular until the late 1990s, when upswept "riser bars" came into fashion; the combination of riser bars and bar ends is rarely used. Some handlebars have bar ends welded onto them but most are clamped to the end of the bar. They are available in many shapes and sizes, such as stubby models that are around 100mm in length to ones that curve around so as to provide even more hand positions.