My wife and I were heading home from a great 3 days riding in Southern WI when (on a two lane road) I hear the roar of two HDs. I looked in my mirror as they flew by me prob 15 mph faster than we were going. Thing was they used my lane to pass. I happened to be riding twards the outside of the lane. Is that common? It got me thinking about what "perhaps unwritten" rules there are while group riding. I realize I should have been paying more attention to my mirrors..............still.