Shoe Heel Drop

Compute heel-to-forefoot shoe drop and screen a supplied zero-drop tolerance.

Description

Shoe heel drop is heel stack minus forefoot stack.

Shoe heel drop is heel stack minus forefoot stack. A symmetric tolerance defines whether the signed difference counts as zero drop.^[1]

Compute heel-to-forefoot shoe drop and screen a supplied zero-drop tolerance.

When to use Shoe Heel Drop

Use this tool to compute heel-to-forefoot shoe drop and screen a supplied zero-drop tolerance.

Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.

How to use Shoe Heel Drop and understand its results

Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.
Enter heelStackMm, forefootStackMm, zeroDropToleranceMm using the field table and calculation rules, then run the tool.
Read heelDropMm, zeroDrop. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
heelStackMm	Heel stack mm	number	Required
forefootStackMm	Forefoot stack mm	number	Required
zeroDropToleranceMm	Zero drop tolerance mm	number	Required

Enter nonnegative stack heights and tolerance mm. Return signed drop and inclusive flag; negative drops are allowed.

drop=heel−forefoot; zeroDrop=|drop|≤tolerance

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
heelDropMm	Heel drop mm	number
zeroDrop	Zero drop	boolean

json

{
  "input": {
    "heelStackMm": 30,
    "forefootStackMm": 20,
    "zeroDropToleranceMm": 2
  },
  "output": {
    "heelDropMm": 10,
    "zeroDrop": false
  }
}

Limitations and assumptions

No shoe geometry, cushioning response or transition suitability is evaluated.

Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.

Alternative or Complementary methods

Use Foam Energy Return: Calculate foam energy return from the supplied measurements. For a complementary task, use Minimalist Mileage Progression: Screen proposed mileage increase against a caller-selected transition cap.

References

Shoe Heel Drop — tool.io

Similar or alternative tools

Foam Energy Return
Calculate foam energy return from the supplied measurements.
Minimalist Mileage Progression
Screen proposed mileage increase against a caller-selected transition cap.