Faint hot metal smell at speed?

[GLK]

I recently noticed a very faint hot metal smell at speed, say over 90mph - on private roads, naturally ...

Is it ball bearings? - I had OSF replaced a few month ago.

I also think it is when the S mode is selected, although I haven't driven in C mode for a while, other than in town / slow traffic ...

 

[Osgee]

What car is it.?

 

[GLK]

Thanks, it's A200 Avantgarde Sports Coupé, C169, 2006 - petrol 2034cc, auto (CVT).