Bicycle and motorcycle geometry
One man's "quick" another man's "twitchy."
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kcox
I ride a track-geometry fixed-gear bike on the street.

Because of a cracked frame (still serviceable, for the moment), I have commissioned a frame builder to make a new frame for me.

In our initial discussions, I have told this frame builder that I like my present frame, and I would like to stay close to it in design, and thus handling.

As a career helicopter pilot, I have a preference for agility, and I will accept a high workload as the price for agility.

That said, I consider my present frame both agile and well-behaved, and I would like to discuss my perceptions of handling based on geometry, and compare my experience with that of others.

My present frame has a head tube angle of 75 degrees, a rake of 28mm, a wheelbase of 969mm, and a bottom bracket height of 275mm.

Extreme, eh?

And yet a very moderate, well-balanced trail of 61.5mm.

I would also like to discuss the significance of wheelbase as it relates to trail.

Anybody out there?
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