Examples
Examples
Try the starting example
- Current tyre measured width (mm)
- 40
- Candidate tyre measured width (mm)
- 50
- Current left gap (mm)
- 8
- Current right gap (mm)
- 6
- Current radial gap (mm)
- 10
- Current tyre radius (mm)
- 350
- Candidate tyre radius (mm)
- 355
- Required minimum gap from component specification (mm)
- 4
- Projected left gap (mm)
- 3
- Projected right gap (mm)
- 1
- Projected radial gap (mm)
- 5
- Smallest projected gap (mm)
- 1
- Margin above entered gap requirement (mm)
- -3
Try another scenario
- Current tyre measured width (mm)
- 40
- Candidate tyre measured width (mm)
- 44
- Current left gap (mm)
- 8
- Current right gap (mm)
- 6
- Current radial gap (mm)
- 10
- Current tyre radius (mm)
- 350
- Candidate tyre radius (mm)
- 352
- Required minimum gap from component specification (mm)
- 4
- Projected left gap (mm)
- 6
- Projected right gap (mm)
- 4
- Projected radial gap (mm)
- 8
- Smallest projected gap (mm)
- 4
- Margin above entered gap requirement (mm)
- 0
Calculation method
Calculation method
Projected left gap (mm)
Current left gap−half the width increase, assuming the same centre plane.
Projected right gap (mm)
Current right gap−half the width increase.
Projected radial gap (mm)
Current radial gap−radius increase.
Smallest projected gap (mm)
Minimum of the three projected gaps; negative values indicate geometric overlap.
Margin above entered gap requirement (mm)
Smallest projected gap−entered required gap.
Symbols and units
- a
- Current tyre measured width (mm)
- b
- Candidate tyre measured width (mm)
- c
- Current left gap (mm)
- d
- Current right gap (mm)
- e
- Current radial gap (mm)
- f
- Current tyre radius (mm)
- g
- Candidate tyre radius (mm)
- h
- Required minimum gap from component specification (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
- A static envelope comparison assuming unchanged wheel centring and symmetric width growth. Real tyre size, flex, debris clearance and component compatibility require measurement and the supplied manufacturer limit.
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: Euclidean geometry and trigonometric identities ↗
Background reading; this does not imply endorsement or independent review of SumFizz.