Originally Posted by
Andrew R Stewart
Not sure about trusting the charts for any one bike. I know of many small but real differences from claimed specs to the actual ones. Also if a tube has a ripple in it after an impact then the length on that part of the tube has changed. Unless you're saying that the tube stretched so the ripple could exist and the angle not change. Not likely, espically with the ripple on the underside of a tube is in the compression zone. I don't know of a typical head end impact that has a force acting on the frame which after compressing the fork rearwards then pulls it back out past the original point (remember springback). So my take is that if there's a ripple there's an angle change.
Now how much and how important (to the bike's handling0 is an angle change is a different story.
I'm not sure how many frames you've straightened but I have a few 2-300 under my belt. Very simply the answer is yes, a ripple can still exist once a frame is straightened to its original angles.
The frameset I referenced to was within +/- 1/2 degree of the catalog spec without it being straightened. I'm sure that was within the original early 90's tolerance range.