CURT 18020 Extendable Bike Rack Replacement Arms for CURT 18021

The CURT 18020 Extendable Bike Rack Replacement Arms allow you to add 2 more bike spots to the CURT 18021 Hitch Mounted Bike Rack. With easy bolt-on installation, these removable arms increase your rack’s capacity from 2 to 4 bikes. When the extension is no longer needed, you can simply detach it and revert to the original 2-bike capacity. The adjustable rubber cradles securely hold bikes without scratching frames, while the durable black powder coat finish of the arms protects against weathering.