Little update:
I tried two different lockrings, with internal and external splines.
I took a 0.7 mm HG washer, split it to get it over the spline and installed it behind the rotor to remove any chance of the lockring bottoming out.
Then I tried more grease on the threads and also grease on the washer of the lockring to prevent friction and hopefully actually reach those 50 Nm I want to tighten it with.
I'm still feeling and seeing the radial movement.
I'm out of ideas to be honest. Can't really explain what's happening and why.
I guess I'll just have to live with it.
Little update:
I tried two different lockrings, with internal and external splines.
I took a 0.7 mm HG washer, split it to get it over the spline and installed it behind the rotor to remove any chance of the lockring bottoming out.
Then I tried more grease on the threads and also grease on the washer of the lockring to prevent friction and hopefully actually reach those 50 Nm I want to tighten it with.
I'm still feeling and seeing the radial movement.
I'm out of ideas to be honest. Can't really explain what's happening and why.
I guess I'll just have to live with it.