Fix-g, WI Eno (non eccentric) or Victoire hubs all offer spline + lockring. These were also made a while back but lockring may interfere with cog as it was designed originally for addition of disc, not cogs: http://urbanvelo.org/montano-velo-fixed-hub-disc-adapter/
Yes there is. The axle gets pushed both ways riding fixed.
Wouldn't it get pushed both ways if you ran SS/hub gear with a disc brake? Applying forward force when pedalling, "backwards" when braking?
Fix-g, WI Eno (non eccentric) or Victoire hubs all offer spline + lockring. These were also made a while back but lockring may interfere with cog as it was designed originally for addition of disc, not cogs: http://urbanvelo.org/montano-velo-fixed-hub-disc-adapter/
Wouldn't it get pushed both ways if you ran SS/hub gear with a disc brake? Applying forward force when pedalling, "backwards" when braking?