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What are the chances that a loose race would be causing the judder?
High. It's basically the same as having excessive bearing clearance.
What sort of headset? If it's a cartridge bearing, you might get away with a split crown race as long as the clearance is small enough to be taken up by the inner bearing compressing the conical seat radially without bottoming out axially.
gbj_tester
@atk
I've recently decided to dabble with a full carbon fork. First time out and I noticed there's a bit of judder when using the front brake. It was a used headset so I popped new bearing in and double checked brakes, rotors, brakepads, hub and spokes but that didn't help. Took everything apart again and I've noticed that the crown race is quite a loose fit and will rock slightly or can rotate without too much effort on the steerer.
What are the chances that a loose race would be causing the judder? Is a new crown race in order or is a bit of movement normal on carbon forks?