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What would make my CL rear rotor move back and forth a few mm a when locked
A fundamental design compromise accepted by Shimano as the price for making something new and proprietary which would still be serviceable by ill-trained monkeys. You can't have no backlash and a sliding fit assembly. As you say, the frequent load reversal which would loosen the lock ring and destroy the splines pretty quickly is not really a feature of bicycle dick breaks. CL rotor/hub interface kinda works for long enough that most people change their bikes before finding out why it's basically inferior to 6-bolt, so Shimano profits keep rolling in.
gbj_tester
Pasty_Spumante
Constable_Savage
What would make my CL rear rotor move back and forth a few mm a when locked (imagine in a similar way you might check a headset). I can't imagine it'd affect performance in real terms as I wouldn't rock back and forth but it seems a bit odd. It's plenty right enough btw