Bicycles, E-Bikes & Micromobility worked example

Field Failure Reserve at 1.3% expected field failure rate: a worked example in bicycles, e-bikes & micromobility

This worked example runs the field failure reserve numbers for a tougher week than the baseline: 1.3% expected field failure rate instead of the typical 1.8%. Estimate reserve for in-service bicycle, e-bike, scooter, or fleet failures using exposed units, average field event cost, expected failure rate, and fixed response costs.

The inputs for this scenario

  • Exposed field units: 8,200 units (held at the documented default)
  • Average field event cost: 95 $ / event (held at the documented default)
  • Expected field failure rate: 1.3 % (the input this scenario stresses; the baseline uses 1.8)
  • Fixed field response cost: 22,000 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Expected variable field failure cost = exposed field units × average field event cost × expected field failure rate.
  • Total field failure reserve works out to 32,127 $ at these inputs, and this is the headline figure for the scenario.
  • Average field event cost works out to 3.92 $ / event at these inputs.
  • Expected variable field failure cost works out to 10,127 $ at these inputs.
  • Fixed field response cost works out to 22,000 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where expected field failure rate sits at 1.8% and the headline result is 36,022 $, this scenario comes in 10.81% below the baseline at 32,127 $.
  • Use it at the start of a warranty period or after a launch ramp to set aside the right reserve for expected battery and drivetrain field events. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Total field failure reserve: 32,127 $ (headline result)
  • Average field event cost: 3.92 $ / event
  • Expected variable field failure cost: 10,127 $
  • Fixed field response cost: 22,000 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Field Failure Reserve calculator, set expected field failure rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.