Chainring tattoos are sort of a sign of a newbie - they usually happen when both feet are down and you either lean into the ring or lean the ring into your leg. First line of defense is DON'T DO THAT!!! When you put a foot down, only put your left foot down. If the right one stays on the pedal, there will be less chance of touching the chain. next, get pant leg straps. You wrap them around your (right) pant leg and close it with velcro. Most bike shops sell them. That will prevent the pant leg from brushing the chain while you're riding. Finally, wipe the chain down before every ride, just to get the excess black stuff off. White Lightning Clean Ride works well to prevent stains, but doesn't last in the rain and doesn't protect against rust.

Now you know why bike shorts and tights are black!