Knee Over Pedal Offset

Measure knee-over-pedal-spindle horizontal offset at a specified crank position.

Description

Knee-over-pedal offset subtracts spindle coordinate from knee coordinate on a shared horizontal axis.

Knee-over-pedal offset subtracts spindle coordinate from knee coordinate on a shared horizontal axis. Absolute tolerance treats front and rear deviations equally.^[1]

Measure knee-over-pedal-spindle horizontal offset at a specified crank position.

When to use Knee Over Pedal Offset

Use this tool to measure knee-over-pedal-spindle horizontal offset at a specified crank position.

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

How to use Knee Over Pedal Offset 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 kneeHorizontalCm, pedalSpindleHorizontalCm, maximumOffsetCm using the field table and calculation rules, then run the tool.
Read kneeAheadCm, withinTolerance. 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
kneeHorizontalCm	Knee horizontal cm	number	Required
pedalSpindleHorizontalCm	Pedal spindle horizontal cm	number	Required
maximumOffsetCm	Maximum offset cm	number	Required

Enter finite signed coordinates and nonnegative tolerance cm. Return signed offset and gate.

offset=knee−spindle; passes=|offset|≤maximum

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

Output field	Meaning	Value type
kneeAheadCm	Knee ahead cm	number
withinTolerance	Within tolerance	boolean

json

{
  "input": {
    "kneeHorizontalCm": 2,
    "pedalSpindleHorizontalCm": 0,
    "maximumOffsetCm": 3
  },
  "output": {
    "kneeAheadCm": 2,
    "withinTolerance": true
  }
}

Limitations and assumptions

Crank position, landmark choice and bike-fit suitability are not validated.

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 Stack and Reach Fit Screen: Compare frame stack and reach with a caller-defined fit window. For a complementary task, use Bike Saddle Inseam Fit: Estimate saddle height from inseam and a caller-selected fitting factor.

References

Knee Over Pedal Offset — tool.io

Similar or alternative tools

Stack and Reach Fit Screen
Compare frame stack and reach with a caller-defined fit window.
Bike Saddle Inseam Fit
Estimate saddle height from inseam and a caller-selected fitting factor.