I have acquired an 80's Trek 620 with a Reynolds 531 main triangle. I've had it sandblasted, after which point I noticed the down tube is slightly out of alignment.
I have noticed the following:
- The TT is true and appears to be damage-free
- The fork is not bent and shows no evidence of a front-end collision
- The DT is curved down a little just below the bottom head lug
- The side-to-side/lateral alignment of the DT is decent- it's as if there was a light impact upwards to the underside of the tube, near the DT shifter mount area.
Can anyone out there tell me if I can straighten this thing? How could that be accomplished? Wood blocks and tapping, or aligning the frame via the head tube?
Any ideas or suggestions would be appreciated, thanks!
Couple of pics are on my Flickr album: