Maybe look at the brake, see whether anything contacts tyre when it’s applied like cable end or whatever. Edit, Ignore. Thought rim not disk.
Not a bad call though - what about mudguard bolts or something? Wrong direction but perhaps if something is sticking out and the wheel has gone in and out of the bike a few times. My money is still on the rack though until we get more info.
@hippy started
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Maybe look at the brake, see whether anything contacts tyre when it’s applied like cable end or whatever. Edit, Ignore. Thought rim not disk.