Difference between revisions of "Head Angle Change With Suspension Travel"

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(Head Angle Change)
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Wheelbase is the overriding factor for how the geometry changes. Different wheelbase bikes will change at different rates. Other factors contibute, obviously, but their effect is very, very minor.
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Wheelbase is the overriding factor for how the geometry changes. Different wheelbase bikes will change at different rates.
 
==Formulas==
 
==Formulas==
 
Here are the equations:
 
Here are the equations:

Revision as of 18:28, 17 December 2007

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

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.

Head Angle Change

Head-angle-change-formula.gif

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


Head-Angle-Change-with-Trav.gif

Bottom Bracket Height Change

Bb-height-change.gif


Bb-Change-with-Trav.gif

Mechanical Trail Change

Mechanical-trail-change.gif


Mt-change-with-travel.gif