Now this looks interesting. The same idea that’s used in road cassettes applied to a fixed-hub. Confused? Here’s Halo‘s explanation:

“An ever present headache with “normal fixed hubs” is the assembly of a drive cog that is attached by a thread being pulled in both directions by the pedal torque. Of course, the traditional solution to avoiding the cog unwinding itself from the hub in the reverse direction is a left hand threaded lockring, butted up tight against the cog.
But, as many riders have found out, this historic system can be relatively volatile.

Halo thought… there has to be a better way:
A splined hub body (with cogs that slide on) and an independent lockring… that never has to handle rotational forces from the drive.”

More information:

• Easy and secure fixing & servicing.
• Adjustable chainline.
• Twin cog option (can run 2 cogs together.)
• Accepts from 12T + cogs (for compact gearing).
• No need for chainwhip tools.

Interesting. Now just make some in a 14mm and with a solid axle!

*Note: Must ONLY ever be used with “7mm base Wide Foot” cogs… such as Gusset “Double Six” cogs to avoid the cog biting into the alloy splines on the hub. Regular width HG cogs should NEVER be used.