BOB Nutz, 3/8 X 26 (Including Nexus 7)
Since not all bicycles have quick-release rear hubs, we designed the BOB Nutz so you may attach any YAK or IBEX trailer to solid-axle wheels. Even with internal-geared hubs (IGH), attaching a BOB trailer takes just a few minutes.  3/8 x 26 (including Nexus 7)