Evening!

Drove my wife’s F55 Cooper Petrol today and noticed when approaching and staying circa 30mph the whole car seems to shake save for the steering wheel! There is no noise with it, very strange!

The feeling disappears through acceleration but reappears circa 60mph but a lot faster.

Traditionally I would have thought wheels/tyres but yet I’m getting no vibration or shaking from the steering wheel?!

Any ideas?

Many thanks!