• 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.

  • Wolf Tooth premium, cartridge bearing. Annoyingly no one seems to have the replacement crown race in stock in this country, only the full lower assembly.

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