The Mach2 Single Rack 2" or 1.25" ($649) holds only one bike, hence the name.
You can add up to three Add-ons ($449 a piece) to the Mach2 Single Rack 2" for a total of four bikes
OR...
You can add up to two Add-ons ($449 a piece) to the Mach2 Single Rack – 1.25″ Hitch for a total of three bikes
Check out the four-bike system in action!