I've always ridden bikes with head angles at or near 73°. My latest was 72.8° with a 43mm fork offset giving c 58 trail. That was sweet.
Now I'm thinking of going to a smaller frame with a head angle of 71.5° with 45 offset giving a trail of 64mm.
I'm wondering what to expect with respect to steering. I guess it will be noticeably different maybe a bit slower at dodging around holes in the road but idk.
Can anyone offer any enlightening observations?

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Steering will be slower
What about trying a fork with 50mm offset?

I have two bikes, one of each type. I honestly don't know which I prefer. For sweeping descents with predictable lines, I sort of like the auto-steering effect of long trail. But when I need to change lines, it requires more countersteer, which I don't like. For climbing, either is fine, just different. In one case I can snap the bike around more, in the other it's more of a stable platform against which I push.

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Might be a possibility of some wheel flop?

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"It never gets easier, you just go faster..." - Greg Lemond

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LOOK uses a 72 degree HTA with 43mm of offset to produce the same 64mm of trail on 51cm frames. It handles fine. There will be no wheel flop.

Slower, but flop is pretty small so not very noticeable.

Notice, many things affect handling a lot, such as rim profile, cable routing and tightness, stem length, weight distribution, etc., so they all play into the total result.

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72°, 43 mm is my favorite. I have a Look KG76, and some prior bikes with that combibation. It just seems "right". I also have other bikes with different combinations that all seem a little quirky somehow.