Been doing this a couple of days now...

Every so often, perhaps once or twice in a journey, steering seems to wobble just a tiny bit...the best way to describe it is that it feels like momentarily the wheels have hit marbles/ice or something or that the wheels are detached from the car.
As I said its really wierd, don't know if its all in the mind tho'. Anyone help?

I've got a X reg classic turbo

 

Might be worth checking the ball joints on the bottom arms for play or the track rod ends.

 

Sorry to state the obvious, abs if happening when braking.

 

Check steering rack bushes, they are probably worn out..
How many miles ?

 

Does it happen once you hit a certain speed? Normally around 50/60mph? If so, I would get the tyres checked and tracking. I have found when I've this problem in the past it normally down to needing new tyres and tracking etc. Simple!

 

What tyres have you got?
I found this with the pirelli assymetrico's I had on mine.
It's the tramlining effect due to the suspension being tied together, this gets worse when the tyres wear down a bit.
I changed to Toyo's and this has now disappeared.
I think some brands are worse than others for this and also uprated anti-roll bars and stut braces can enhance this as well.

 

thanks guys, to answer all questions;

- its done 85,000 miles
- it does it at all speeds
- tyres are bridgestone potenza's which are about half way done