My custom Strong has 73 HTA and 51mm offset for 48mm trail with 650Bx38 tires. This combo makes it handle like a road bike. And it is also fine with 700Cx25 at twice the pressure (80 psi). This is what older all rounder bikes often had as front end geo. I copied my ‘72 Bob Jackson, which has been run with skinny tubulars unladen to fully loaded for touring with 32mm tires and handles fine.
If I were riding all gravel and no pavement I'd likely choose to slacken the HTA and increase trail. New England dirt roads aren't like a lot of the chunky gravel I see photos of here from our Western forum members.
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