A handlebar coupling and adjustment unit comprises a housing, a pivot pin, a manual grip and a retaining pin. The housing receives an end portion of a handlebar. The pivot pin joins the housing to the handlebar and pivotally supports the handle relative to the handle bracket. The retaining pin is connected to the manual grip and is linearly translatable in a first direction from an extended positioned projecting beyond the housing to a withdrawn position within the housing. The manual grip is rotatable while the retaining pin is in the withdrawn position between a locked position in which the housing holds the manual grip with the retaining pin in the withdrawn position and an unlocked positioned in which the manual grip is linearly translatable in a second direction to return the retaining pin to the extended position.