Help needed, steering wheel vibration at 100+ kph

[Mk1DUB]

When they put the tyres on the new wheels they said it included balancing... so I imagine that would be the weights, yes? They didn't have the car, just the wheels, that wouldn't stop them from balancing the wheels though right?

The rims appear to be in good condition and there was no wobble for the last week (or before for that matter) since having the suspension/wheels set up at the shop.

[sports racer]

It's rare but wheel weights do fall off. Expect to pay for them to check the wheel balance.

Have you tried swapping the back wheels with the fronts to see if the vibration goes away?

You can also try this. Jack up one of the front wheels so that it's off the ground (with the other front wheel still on the ground). Make sure you are jacking up the body - don't put the jack under the wishbone and lift it from there. With the wheel now off the ground grab it on both sides like a giant steering wheel and try and twist it left/right then move your hands to top and bottom of the wheel and twist up/down. What you are trying to find is any play in the steering or bearings. The wheel should turn the steering slightly left/right as it distorts the tyre on the other wheel but there shouldn't be clunking sounds or freeplay. Up/down there shouldn't be any movement at all.

Remember you're trying to twist the wheel, not lift it up/down or left/right.

That should keep you busy for a while but it will tell you the condition of your steering rack, wheel bearings, tie rod ends, wishbone bushes and lower ball joint.

Cheers

Paul