Tanker brings up a very valid point re tyres.
Are your tyres the originals or did you change them when you replaced the wheels? If they are the same age as the car, ditch them.
The only real way to identify the fault as being in the wheel / tyre combination is to borrow a set of front wheels from another vehicle. If the vibration remains, you need to dig further.
Front wheel out of balance usually affects the steering wheel, rear wheel out of balance usually is felt through the seat / chassis.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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