Difference between revisions of "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. | |
| − | |||
| − | Different wheelbase bikes will change at different rates. | ||
==Formulas== | ==Formulas== | ||
Here are the equations: | Here are the equations: | ||
| − | A12 = Initial Head Angle | + | *A12 = Initial Head Angle |
| − | B12 = Fork Offset | + | *B12 = Fork Offset |
| − | C12 = Sagged fork length | + | *C12 = Sagged fork length |
| − | D12 = Initial Wheelbase | + | *D12 = Initial Wheelbase |
| − | E12 = Initail BB Height | + | *E12 = Initail BB Height |
| − | F12 = Chainstay Length | + | *F12 = Chainstay Length |
| − | G12 = Wheel Diameter | + | *G12 = Wheel Diameter |
| − | 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 or chassis/fork flex. | ||
| + | |||
| + | Otherwise, they are perfect. | ||
==Head Angle Change== | ==Head Angle Change== | ||
| + | [[Image:Head-angle-change-formula.gif]] | ||
| + | |||
| + | or in a more round about way:<br> | ||
[[Image:Head-angle-change.gif]] | [[Image:Head-angle-change.gif]] | ||
| + | |||
| + | |||
| + | [[Image:Head-Angle-Change-with-Trav.gif]] | ||
| + | |||
==Bottom Bracket Height Change== | ==Bottom Bracket Height Change== | ||
| + | |||
| + | [[Image:Bb-height-change-formula.gif]]<br> | ||
| + | |||
| + | or in a more round about way:<br> | ||
[[Image:Bb-height-change.gif]] | [[Image:Bb-height-change.gif]] | ||
| + | |||
| + | |||
| + | [[Image:Bb-Change-with-Trav.gif]] | ||
| + | |||
==Mechanical Trail Change== | ==Mechanical Trail Change== | ||
[[Image:Mechanical-trail-change.gif]] | [[Image:Mechanical-trail-change.gif]] | ||
| + | |||
| + | [[Image:Mt-change-with-travel.gif]] | ||
| + | ==Wheelbase Change== | ||
| + | [[Image:Wheelbase-change-with-trave.gif]] | ||
[[category:Bicycle]] | [[category:Bicycle]] | ||
[[category:Frame Building]] | [[category:Frame Building]] | ||
| + | |||
| + | [[Category:Suspension (Bicycle)]] | ||
Latest revision as of 15:51, 19 May 2008
Wheelbase is the overriding factor for how the geometry changes. Different wheelbase bikes will change at different rates.
Contents
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
or in a more round about way:
Bottom Bracket Height Change
or in a more round about way:
Mechanical Trail Change
Wheelbase Change
