I wondered about rusting. My frame was pretty shabby anyway, but when I stripped it down again a year after drilling it, the back brake bridge was pretty grim. With a chromed frame, I'd guess that they'd chrome it after drilling the original brake holes, so it would be protected. Drilling it again might make it rust a bit, but then I guess it depends how nice you are to your bike. Im ashamed to say mine get thrashed around in all weathers, left outside and rarely cleaned.
I wondered about rusting. My frame was pretty shabby anyway, but when I stripped it down again a year after drilling it, the back brake bridge was pretty grim. With a chromed frame, I'd guess that they'd chrome it after drilling the original brake holes, so it would be protected. Drilling it again might make it rust a bit, but then I guess it depends how nice you are to your bike. Im ashamed to say mine get thrashed around in all weathers, left outside and rarely cleaned.