I have often wondered (and i'm sure it's a simple answer)why wheels are sometimes painted black and white like this? The only reason I could think of is so you can see if the vehicle is moving from a distance.
Added by Michael G on 06 January 2012.
It is for identification as emergency vehicles when parked at an incident, and used to be very common in Sweden and Finland. French and Russian fire trucks used to have whitewall tires for the same reason, and to this day many South American fire companies have full chrome or stainless steel wheel covers for the same purpose...
Added by Michael G on 06 January 2012.