Examples
Examples
Try the starting example
- Hub locknut spacing (mm)
- 140
- Left locknut to left flange, inward (mm)
- 50
- Right locknut to right flange, inward (mm)
- 30
- Rim plane offset right of hub midpoint (mm)
- 0
- Rim-to-left-flange axial distance (mm)
- 20
- Right-flange-to-rim axial distance (mm)
- 40
- Flange-plane separation (mm)
- 60
- Rim offset right of flange midpoint (mm)
- -10
Try another scenario
- Hub locknut spacing (mm)
- 140
- Left locknut to left flange, inward (mm)
- 50
- Right locknut to right flange, inward (mm)
- 30
- Rim plane offset right of hub midpoint (mm)
- 10
- Rim-to-left-flange axial distance (mm)
- 30
- Right-flange-to-rim axial distance (mm)
- 30
- Flange-plane separation (mm)
- 60
- Rim offset right of flange midpoint (mm)
- 0
Calculation method
Calculation method
Rim-to-left-flange axial distance (mm)
Rim offset−(left inset−hub spacing/2).
Right-flange-to-rim axial distance (mm)
(hub spacing/2−right inset)−rim offset.
Flange-plane separation (mm)
Hub spacing−left inset−right inset.
Rim offset right of flange midpoint (mm)
Rim offset−(left flange coordinate+right flange coordinate)/2.
Symbols and units
- a
- Hub locknut spacing (mm)
- b
- Left locknut to left flange, inward (mm)
- c
- Right locknut to right flange, inward (mm)
- d
- Rim plane offset right of hub midpoint (mm)
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
- Axial measurements relative to the midpoint between locknuts. This describes geometry only; it does not calculate spoke tension, wheel strength or a truing adjustment.
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
Sheldon Brown: measurements for spoke-length calculation ↗
Background reading; this does not imply endorsement or independent review of SumFizz.