Difference between revisions of "Head Angle Change With Suspension Travel"
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*H12 = Fork Compression or extention from sagged | *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. | + | 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. | Otherwise, they are perfect. | ||
Revision as of 17:17, 15 December 2007
According to very accurate calculations that I have done, the head angle will change on a hard tail mountain bike approximately 0.0521° per mm of travel if it has a 1058mm initial wheelbase. The bottom bracket height will change approximately -0.3868mm with each mm of suspension travel.
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
Bottom Bracket Height Change
Mechanical Trail Change
