If you have 255s put on the spare the opposite races will take the load in the bearing and you'll know right away.

If you can get the tick to be repeated reliable use a vibration app and get a tick per second and do some math to determine how many clicks per revolution.

If it's 5/6 (number of balls in CV it's the CV), if it's 2/3 it's likely in the bearing. (though usually bearing will be 1x).

Both wife and my X have a bad bearing coincidentally both front left.
Have the new bearings but haven't had the time to install so I put 235s on our front lefts and all the bearing howl is completely absent.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)