Originally Posted by
merlinextraligh
^ I'd definitely argue for getting the fork replaced as part of the damages. However, there's no need to replace the frame out of fear of latent damage. The frame is steel, and its not going to fail catastrophically from damage you can't observe.
The LBS can look the frame over, if its not twisted out of alignment, and there's no dents, buckling in the tubes, or cracking in the paint, the frame is likely as good as ever. If the frame took a hit that wasn't sufficient to cause any of the above, and it rebounded to its original shape, it didn't cause it long term damage, which is a good thing about steel. You can bend it over and over, and as long as you don't bend it too far it doesn't hurt it.
As someone who has had several steel bikes fail at the seat tube/bottom bracket junction, including a tandem, as well as a few fail at the top of the seat stays, I'm not sure I buy that. In my failures, there was no visible damage, not even paint cracks, and it's not like simply pedalling down the road (no wrecks) should bend the bike too far, and yet there they were, all broken. Obviously I applied forces that were beyond the capability of the metal to withstand over time.
I would be concerned that an impact like the OP's would hasten such failures. I suppose one of our materials folks will set me straight here, but I wouldn't be quick to dismiss the possibility of the frame failing prematurely because of the wreck.