I am currently riding a Katrina'ed Schwinn Super LeTour with 4130 tubing. Ive been riding it for months now, but I just got the idea to shine a flashlight down the downtube. I was greeted with a so well known orange color and rough texture. I havent had any problems yet and I have been riding it pretty hard [but hey it was free!]. Should I be afraid? Should I start looking for another frame?