Originally Posted by 63rickert

No one has mentioned that 71 degrees is also a bit odd for a road bike. It happens a lot on small frames (which then handle badly) and it has come back for gravel grinders and 29ers. On 29ers the idea is you don't bother with dodging small obstacles, you just plow straight ahead and let the big tire handle it. The yellow bike does look a lot like a current era gravel bike. It does have a lot of fork rake, as it should with that head angle, and would likely be better than a lot of the new bikes if used for gravel.

Had a conversation recently with a framebuilder who must remain nameless. Have known the guy for almost 50 years now. He built lots of race frames, and some fairly well known riders used his frames. When he didn't know much about his client they got 60mm of trail. If he did know them, and knew they couldn't ride, they got 62-65mm of stability so they wouldn't fall down. If he knew them and they could ride they got neutral handling with 57mm of trail. If they were very good riders other factors were considered and the bike would have 50-57mm trail depending on how it all sorted out. Those who wanted less than 50mm were referred to other builders who knew that end better.