Head angle.

Head angle.

balhoofdhoekThe head angle, also called caster or rake, is with bicycles the angle in which a head tube is tilted in the longitudinal direction with respect to a vertical line.
With bicycles, the term “rake” is common, with four-wheel vehicles the term “caster” is common.
But both terms have the same meaning and function.
Positive rake is when the top of a (possibly imaginary) lineis backward inclined, if it leans forward, there is a negative rake.

Along with the fork offset and trail they determine the most important part of the steering behavior.

 

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