A Wide Bike with a Circular Wheel

Not living near Stonehenge or Avebury I really couldn't think of what to blip today for Bob's wide challenge of ring or circle. 
I even double checked the bull to see if he had a ring through his nose but he doesn't.

The bike wheel is a circle but not wide but then Mr isbi pointed out that the BMW is about as wide a bike as you can get. 
That's to do with the horizontally opposed twin cylinders. 
If you don't know what they are you probably don't want to know.