If the tyre swap fails to change anything, that was to be next area to check out. (was just avoiding having to pull of inspection/under-body plates).
Very frustrating and "odd", and noise has been getting louder since I first noticed it.
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Swapped front drivers wheel for a spare and the noise disappeared (stopped totally).
The wheel I took off has a near new tyre, the replacement was my 3rd worst spare with the legal minimum tread (because that wheel was handy), but the tapping noise in sync with the wheel stopped.
Inspecting the offending wheel, doesn't show any distortion, no bulges/separations evident. The tyre looks all good, 85% tread.
So will take wheel to the tyre dealers, get them to strip it down and see what they reckon.
The noise might be from some sort of separation in progress that i cannot see as yet, as the sound has been slowly getting louder.
I once had a brand new tyre that looked round, was balanced, but car jumped like a pogo stick as your speed increased.
Thanks for help in suggestions.
And yes I know Graeme suggested swap tyres about first thing (thank you), but near new tyre and looked OK ???
Perhaps get them to check the dynamic balance of the tyre and wheel. Otherwise a new tyre under warranty I hope?
I'd be surprised if a piece of wire or nail isn't found, perhaps pushed far enough through to tap on the rim.
OK, so took offending wheel to tyre place. They stripped it off, several heads looked inside the tyre and all about, unable to find any reason.
Nil separations, bulges or such inside or out.
Re-fitted tyre, balanced and back on vehicle.
NOISE GONE. aaaaarrrrgggghhhh go figure??
Scrutinise the rim for cracks.
I remember having a tyre many years ago that creaked on its rim. I assume it had been fitted with insufficient lube and refitting it with adequate amounts of slippery stuff quietened it.