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THE FEUTEX TOOLKIT

Bicycle Chain Wear Measurement

Calculate elongation from a measured span and a chosen nominal reference length.

Cycling workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaElongation = 100*(measured-nominal)/nominal; Lower = 100*(measured-uncertainty-nominal)/nominal; Upper = 100*(measured+uncertainty-nominal)/nominal

Worked example

Inputs

Nominal
304.8 mm
Measured
306 mm
Uncertainty
0.2 mm

Expected results

Elongation
0.3937007874 %
Lower
0.3280839895 %
Upper
0.4593175853 %

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter the measured quantities and your own planning assumptions.
  2. Review all calculated outputs and the stated limitations.

Try this example

{
  "nominal": 304.8,
  "measured": 306,
  "uncertainty": 0.2
}

Accuracy and scope

Measurement arithmetic only. Consult the chain and drivetrain manufacturer for replacement thresholds and measuring method.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.