As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DEPARTING ON FLT. ON TAKE OFF ROLL NOSEWHEEL SHIMMY AND VIBRATION WAS FELT. THE TAKE OFF WAS ABORTED. MAINTENANCE INSPECTION REVEALED FROZEN GRAVEL AND ICE ON THE INNER RIM OF BOTH NOSEWHEELS. THE NOSE U/C AND SHIMMY DAMPER WAS INSPECTED, NO DEFECTS WERE FOUND. BOTH NOSEWHEELS WERE CHANGED AND THE A/C RELEASED TO SERVICE. NO SUBSEQUENT VIBRATION WAS REPORTED.