Throttle grip black for large clamping range JMP The throttle grip aid is pushed directly over the throttle grip. It ensures an effective force distribution on the heel of the hand over long distances and prevents cramping and joint pain. The resting palm then works like a cruise control. When not in use, the throttle grip aid can be moved to a neutral position. The article is applicable to imperial handlebars and heating or chopper handles (clamping range Ø 35 - 40mm).