Originally Posted by
Seggybop
Are you kidding? The splines are far more durable than aluminum threads; you'll never have to worry about them stripping. It still employs something like a lockring, but it's a steel spring circlip that makes it impossible for the cog to lift out of position.
I've never heard of a single case of a coaster brake of 3speed cog coming off while in use, ever. (though now, someone's going to jump in with some horror story...)
No I am not kidding. Thank you for asking. Do you have some evidence about what appears to be a six "spline" system held on by a round ring being more durable than a properly installed lockring and cog? Most coaster brake and internally geared hubs have never been put through the amount of torque applied during a strong skid on a fixed gear.
ALSO: the quality of cogs that I am looking for really doesn't exist in this internal gear world.