Examples
Examples
Try the starting example
- Measured rivet-to-rivet pitch intervals
- 24
- Nominal pitch (mm)
- 12.7
- Measured span (mm)
- 306.324
- Entered comparison wear threshold (%)
- 0.75
- Nominal span (mm)
- 304.8
- Measured elongation (mm)
- 1.524
- Measured elongation (%)
- 0.5
- Margin below entered threshold (percentage points)
- 0.25
- Comparison with entered threshold
- Below entered threshold
Try another scenario
- Measured rivet-to-rivet pitch intervals
- 24
- Nominal pitch (mm)
- 12.7
- Measured span (mm)
- 307.848
- Entered comparison wear threshold (%)
- 0.75
- Nominal span (mm)
- 304.8
- Measured elongation (mm)
- 3.048
- Measured elongation (%)
- 1
- Margin below entered threshold (percentage points)
- -0.25
- Comparison with entered threshold
- At or above entered threshold
Calculation method
Calculation method
Nominal span (mm)
Pitch count×nominal pitch.
Measured elongation (mm)
Measured span−nominal span; a negative value remains visible.
Measured elongation (%)
100×(measured span/nominal span−1).
Margin below entered threshold (percentage points)
Entered threshold−measured elongation percentage.
Comparison with entered threshold
Compare measured elongation with the supplied threshold, allowing only scale-relative floating-point roundoff.
Symbols and units
- a
- Measured rivet-to-rivet pitch intervals
- b
- Nominal pitch (mm)
- c
- Measured span (mm)
- d
- Entered comparison wear threshold (%)
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 pin-centre measurement comparison, not a roller-play gauge conversion. The threshold is an entered example, not a universal replacement recommendation; use the chain manufacturer’s requirement.
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
Park Tool: chain measurement and threshold variation ↗
Background reading; this does not imply endorsement or independent review of SumFizz.