I've read on this forum about some aluminum frames having a 'pinched' area on the driveside of the seat-tube to accomodate some derailleurs. Is this illustrated in the attached pic? This is a used frame that I would like to build up...assuming it's not broken.
Yeah, I assumed as much--but I've also managed to get a small, perfectly symmetrical dent on my car, paint intact. Then again, the car dent was perfectly round and shallow (not oblong with a central depression), and on a fiberglass panel...just double checking.
It's normal, for front derailleur clearance. Here is the same question at velonews.com, with a response from Trek. The article is "[font=Verdana][font=Verdana]A dimple, a dent or...."[/font][/font]