hi, we're bike mechanics at a shop without any real trained machanics working. (yikes!)
that aside, we got a trek cyclo-cross bike in this morning with a 40x52 chainring up front and a 11x28 7sp in the back. he had some broken "rsx?" (its rubbed off) shifters. so the question is can we put 7spd sora shifters on there or does a range like that require some sort of cross shifter?