Did you hit a pothole or kerb to dent the rim?
I'd say so, although it wasn't a spontaneous kind of failure, as it was on my way out for a ride that I noticed it. Strange one. My rim does have a dent in it. Anyhow, it's in @cycleclinic's able hands now (or 2 working days).
@exteroceptive started
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Did you hit a pothole or kerb to dent the rim?