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Hi all, have noticed that the car gets a vibration through the steering & chassis at around 50 km/h, it isn't there at lower speeds and has disappeared at 60 km/h. No problems to speak of at 100 km/h on the highway either, so I'm thinking its not a wheel balance problem?? Any thoughts? Maybe some slack in steering bushes or similar that gets a harmonic going only at a certain speed? Could be lots of things.
Car is stock, tyres have done only 4,000km, 108 thou on the clock.
Cheers,
Mike

It could well be the wheels themselves. My factory NB8A ones got buckled somehow (no idea how), and it would vibrate only at about 100km/h. Go faster, and it disappeared, go slower, and it disappeared.

I'd suggest getting the wheels themselves checked to see if they're slightly deformed.

I have something similar. On my street rims/tyres, there is a vibration that comes in at 50km/h, but is gone by 60 km/h. Nothing at 100. Swap over to the trackday stickies and the problem is gone.

See if you can borrow another set for a test drive and hopefully it goes away.

I have the same problem with mine, I actually paid to get a wheel allignment/balance done last weekend and came back with the a report telling me all FOUR of my wheels are buckled.
Mine starts shuddering/vibrating around 50km/h, goes away at 60, though I do tend to notice it coming back around 100 up. That seems to have been cleared up by the balance however, so I could have had two issues. Now on the lookout for a new set of wheels!

Geez all 4! Guess its time to go shopping then! Mine's not too bad, just noticeable with 50 km/h being the metro limit you sit on that speed a fair bit. Maybe I'll haver to get some 949's or Enkei's, but then I'll need to go lower, so then..................!!! $$$$

Indeed it is! Kinda fun actually, though I'll probably be only spending a little, not a lot of money around this time of year!