Head Angle Change With Suspension Travel

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Wheelbase is the overriding factor for how the geometry changes. Different wheelbase bikes will change at different rates.

Contents

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Formulas

Here are the equations:

  • A12 = Initial Head Angle
  • B12 = Fork Offset
  • C12 = Sagged fork length
  • D12 = Initial Wheelbase
  • E12 = Initail BB Height
  • F12 = Chainstay Length
  • G12 = Wheel Diameter
  • H12 = Fork Compression or extention from sagged

These formulas are not designed to work with 2 different wheel sizes and do not account for tire deformation or chassis/fork flex.

Otherwise, they are perfect.

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Head Angle Change

Image:Head-angle-change-formula.gif

or in a more round about way:
Image:Head-angle-change.gif


Image:Head-Angle-Change-with-Trav.gif

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Bottom Bracket Height Change

Image:Bb-height-change-formula.gif

or in a more round about way:
Image:Bb-height-change.gif


Image:Bb-Change-with-Trav.gif

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Mechanical Trail Change

Image:Mechanical-trail-change.gif


Image:Mt-change-with-travel.gif

[edit]

Wheelbase Change

Image:Wheelbase-change-with-trave.gif

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