With the Thule AcuTight button you mount your valuable road bike or mountain bike safely to the bike carrier. The ThuleAcuTight button is mounted to the frame holder of your carrier. The dial is provided with an integrated power limiter that 'clicks' when the optimal power is achieved. This way you control the tightness of the clamp on the frame. Perfect when you want to mount a road bike or mountain bike to the bike carrier.