Halo: Fix-G Splined Fixed Hubs Nov 1, 2010


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.

  • 8pmhangover

    This piece of kits bit around for a little while and works great, the only problem is the HG spline interface that Shimano specifies can only go down to a 12t cog (same as standard threaded hubs), and also is not designed to take a load in both directions. Unless that interface is machined over-tolerance, most cogs will be able to rock for and aft ever so slightly, which will then cause the lockring to gradually loosen up.

    Take the Miche cog carrier system for instance, it works great on the track, but as soon as you dump it on the street and skid with it, that cog starts to wobble back and forth and work the lockring loose.

  • That is exactly my concern as well. We have been trying to develop a fixed spline hub for a while now and I guess with bigger companies coming out with there own niche in FGFS, hopefully we will see someone get it right soon! Def worth trying out though since Halo products are decent for the budget consumer.

  • gob

    This would last 15 minutes of FGFS underneath you, John. Needs bigger splines.

  • Chris

    I’ve been testing the prototye off this hub for the last 6 months now with no worries riding FGFS. The HG spline is fine, I’ve had no movement with mine.

  • why haven’t we seen this before? really great idea.
    However it does seem like the cog would losen or eat away at sharp corners of the spline. But an easily solution to that would be to make the spline curved, similar to the way the outer spline of a tree sprocket works.