How big a rail will they fit? User profile Updated July 17, 2020 20:21 Follow The TimberLine will fit; Round tube up to 2 13 /16" (71.44mm) outside to outside diameter Square tube 2 1/4" (57.15mm) outside to outside Minimum diameter these will fit is 5/16" (7.94mm) Related articles Timberline Tower Instructions Fits, how to see what will work with your car U.S. Customer Support CrossBar Weight Limits Ridgeline Tower Instruction
