My wife has a 80's model Miyata Tri Cross that she loves to death. She's had it since it was new. She bought herself a Merceir road bike to use in triathlons but didn't feel quite right on since it has been a long time since she was on a bike. She wants to restore the Miyata and use that to train on and get compfy with and then switch back to the Merceir. Here's the problem. On the bottom of the chain stay where the rear derailer attaches to the frame the tab (for lack of a better word) is bent in approximately 1/4 inch casuing the derailer to rub against the spokes. I was just going to place it into a vice and straigten it back out however she said that it would not be safe to ride. I was going to do this very slowly so as not to cause any more stress on the metal if there even is any. Any thoughts? Can I do this with out causing any damage?