Anyone know what the AWG of brake cable is?? I've got a 1990 Rockhopper that came to me with a piece of PFTE tubing running between the frame stops of the rear brake for the purposes of protecting the frame from cable slap it works far better than the little "donuts" usually sold for the same purpose; however, it's apparently a practice that no one does anymore (even though such tubing is still available.), but I need to know what the AWG of the brake cable is so I know what inner diameter and thickness of the PFTE spaghetti tubing to look for.