QR3 Center Support
Offers verticle support to the middle of your rack system.
Needed for multiple heavy bikes, for example: more than one 50lb bike such as e-bikes installed on a 60" or wider system.
Center Support reduces bar flex and weight on the ends of the crossbar.
Systems under 65" wide with up to 4 bikes under 30lbs each usually do not require a center support.
Center Supports are height adjustable from 15" to 19.5" to fit various trucks. The measurement is taken from under the crossbar to the floor of the truck bed.