Spank Single-Speed DJ Freehub Fine-Tune The Gearing If you're running a single-speed setup on your dirt jumper, you can fine-tune it with a new freehub cog. The Spank Single-Speed DJ Freehub is compatible with the SS-DJ rear hub. This is a steel 1-piece cog that has 3 bearings to keep things smooth. Features Compatible with SS-DJ rear hubs Weight: 120 - 132g Available in 11T, 12T, and 13T | Spank | Ss-Dj Freehub 11T Silv & Blk