Examples
Examples
Try the starting example
- Hypothetical cylindrical fork internal bore (mm)
- 40
- Uniform rod diameter occupying bore (mm)
- 20
- Supplied initial air-gap length (mm)
- 150
- Supplied target air-gap length (mm)
- 130
- Identical fork legs
- 2
- Modeled annular cross-sectional area (mm squared)
- 942.477796
- Target minus initial air-gap length (mm)
- -20
- Modeled fluid-volume change per leg, positive addition (mL)
- 18.849556
- Modeled total fluid-volume change, positive addition (mL)
- 37.699112
Try another scenario
- Hypothetical cylindrical fork internal bore (mm)
- 40
- Uniform rod diameter occupying bore (mm)
- 20
- Supplied initial air-gap length (mm)
- 150
- Supplied target air-gap length (mm)
- 160
- Identical fork legs
- 2
- Modeled annular cross-sectional area (mm squared)
- 942.477796
- Target minus initial air-gap length (mm)
- 10
- Modeled fluid-volume change per leg, positive addition (mL)
- -9.424778
- Modeled total fluid-volume change, positive addition (mL)
- -18.849556
Calculation method
Calculation method
Modeled annular cross-sectional area (mm squared)
pi/4×(bore²−rod²), requiring bore>rod.
Target minus initial air-gap length (mm)
Target−initial supplied air gap.
Modeled fluid-volume change per leg, positive addition (mL)
Annular area×(initial−target)/1000, converting cubic mm to mL.
Modeled total fluid-volume change, positive addition (mL)
Per-leg ideal volume change×leg count.
Symbols and units
- a
- Hypothetical cylindrical fork internal bore (mm)
- b
- Uniform rod diameter occupying bore (mm)
- c
- Supplied initial air-gap length (mm)
- d
- Supplied target air-gap length (mm)
- e
- Identical fork legs
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Hypothetical uniform-annulus geometry only. Actual fork internals, spring displacement, oil level procedure and acceptable air gap are not inferred; the target gap is supplied externally and this is not a service instruction.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
OpenStax: ratios, unit rates and supplied measurement arithmetic ↗
Background reading; this does not imply endorsement or independent review of SumFizz.