I have a friend in a smaller town who wants to set up his bike with a plastic/ballistic Nylon bash guard. The town is small so it would not be hard for the police to pin bash ring marks on him. He is currently in the market for a new set of cranks and the bash ring will be a major factor in his decision making process. I know he wants 165mm cranks and plans on running a 20-22 chainring. Any help will be appreciated.