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Re: humming noise at 30mph .... bearing ?
Very unlikely to be the diff on the rear end of a Clio.
But of course sound can travel in weird and wonderful ways.
Probably best to start with jacking it up and spinning wheels, trying to find play (push and pull top to bottom of wheel) or if any "knock" or click as wheels rotate.
check brakes at same time incase of binding and make sure nothing rubbing on tyres.
Currently in Dancingdad's garage:
Qashqai 1.6 spark driven, Kia Sedona 2.9 TDI, Scenic II 15DCi 2004 (SORN) not quite RIP.