Thule AcuTight Knob Black Accessory 528001Thule AcuTight Knob knob black A torque limiter accessory for rear mounted bike carriers with frame holders replacing the standard knob. The Thule AcuTight knob has a built in torque limiter that clicks when optimal hold is reached indicating correct mounting The controlled torque going into the bike frame prevents an under and over tightening of the holder Ergonomic soft grips The Thule AcuTight knob fits all Thule rear mounted bike carriers with