• Capable of being dismounted; -- said of a form of rim, for an automobile wheel, which can be removed with its tire from the wheel.
De·mount'a·ble [ See De- ; Mount .] Capable of being dismounted; -- said of a form of rim, for an automobile wheel, which can be removed with its tire from the wheel. 
demountable 1. To remove from a mounting, setting, or place of support; such as, a gun. 2. To take apart; to disassemble. 3. Capable of being dismounted, dismantled, or removed and readily reassembled or repositioned.