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New tyres, contrary to belief, will infact give more compliance on the side walls than an old and worn tyre will. The extra tread will give a floating effect when rocking the steering slightly from left to right at higher speeds, most noticable beyond say 50mph. It can actually feel quite worrying at first but give it say a few thousand miles and it will be far less obvious.
The knocking you are talking about, I would be 95% sure (if its coming from the rear and below say 30mph on cobbled and slight bumps) would be your rear fork control arms. This will not show any signs of play and will require replacement arms to fully remove the noise. Very audible inside the cabin due to the arms attaching at the firewall behind the seats.
Gaz
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