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If there are no noticeable rocks/debris as Steve states another possibility is it may be normal noise. Tires will deform slightly when rolling to form a flat contact patch with the road surface. When this happens the rubber treads stretch and compress and make "groaning" sounds. The quality and type of rubber, the tread pattern, and the age of the tire ...


Common causes from personal experience are general related to stones or pebbles jammed somewhere. Places to check are in the tyre treads themselves and also between the brake disc and the dust guard behind the disc (don't burn yourself though as the disc can become quite hot after recent operation).

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