Rock Mounts "StreetRod" is a thru-axle adapter for fork-mounted bike racks. It includes axles (adapters) to accommodate mountain bike forks with 12x100, 15x100, and the new "Boost" 15x110 thru-axles.

Will work with a bike rack tray that accepts 9mm quick release fork mounts - no need to get rid of your existing bike racks. Compatible with Thule, Yakima, RockyMounts, Inno, etc.

I bought this for my racks, but then sold the car (with the racks) before ever using using this adapter.

Here's how it works: