Pedal and shoe stack height: compare the same assembly and endpoints
A pedal's stack is not the whole distance to the foot. Keep cleat, adapter, sole and insole references visible before comparing systems or re-checking a bicycle setup.
Published 8 October 2026 · OpenBikeFit
Pedal interface field guide · schematic
Same endpoints. Then subtract.
Fictional declared stack: A 12 mm · B 15 mm · B − A = +3 mm
Sole, insole and foot reference are not silently included.
Schematic, not to scale or an automatic saddle adjustment.
On this page
- 01Name both endpoints and every included layer
- 02Mounting configuration is part of the number
- 03Follow a fictional like-for-like difference
- 04Do not silently convert stack into a saddle instruction
- 05Crank length is a different geometric variable
- 06Keep adapters, shims and clearances as physical checks
- 07Keep a before and after record that can be read
Identify before adjusting
Record the assembly on paper
Use the existing free workflow and its own gates. Reading a guide or opening a tool does not approve hardware or create a trial.
Open toolStack height describes a separation between two named surfaces or points. At the shoe–pedal interface, a published value may concern the pedal and cleat, or a particular mounting arrangement. It does not automatically describe the distance from the pedal axle to the foot inside the shoe. Without the endpoints and included layers, two apparently precise millimetre values can refer to different assemblies.
This guide helps you record what is included, compare like definitions and preserve a baseline after a shoe or pedal change. It does not rank products by speed, prescribe a saddle correction or approve removing parts to obtain a lower number. A smaller catalogue stack is a dimensional claim under a stated configuration, not a rider outcome.
Name both endpoints and every included layer
Begin at the lower endpoint specified by the manufacturer, often related to the pedal spindle axis, and identify the upper surface used in that specification. Then list what lies between: pedal mechanism, cleat, any required mounting plate or adapter, and any additional layers that the definition explicitly includes. The words total stack are meaningful only with that inclusion list.
The foot adds another measurement problem. A shoe sole, insole and a named foot reference may extend beyond the advertised pedal/cleat dimension. Their shapes and loading conditions matter to a physical reading. Do not add a guessed sole thickness from a different model or assume that a catalogue value measures the same point inside every shoe.
Mounting configuration is part of the number
A cleat assembly fitted directly to a compatible shoe pattern and one fitted through an approved adapter can have different stack definitions. Keep the shoe pattern and adapter identity beside the value. Wahoo's SPEEDPLAY COMP specifications illustrate why mounting configuration is named with the stack figure instead of publishing one context-free number for every shoe.
Model and revision also matter. If sections of a current product page disagree about a dimension, do not pick whichever value creates the preferred comparison. Ask for the applicable current technical instruction or leave the exact difference unresolved. The calculation below deliberately uses fictional like-for-like figures rather than converting conflicting catalogue details into a supposed physical improvement.
Follow a fictional like-for-like difference
Suppose assembly A is declared as 12 mm and assembly B as 15 mm from the same lower axis to the same upper mounting surface, in the same condition. B minus A is +3 mm. This is an exact statement about those defined separations. It does not say that the foot rose by exactly 3 mm, because the shoe and any other unaccounted layers could also differ.
If A instead includes the shoe sole while B stops at the cleat, the subtraction is not a like-for-like comparison at all. Keep both original values and their definitions rather than relabelling one to manufacture agreement. A tenth-of-a-millimetre display cannot repair a missing endpoint, a different configuration or an unverified physical thickness.
Do not silently convert stack into a saddle instruction
Changing a pedal/shoe assembly changes one part of the contact chain, but an actual saddle-to-foot relationship also depends on the crank path, saddle reference, shoe and the measured riding condition. A nominal stack difference alone does not establish the same contact point or preserve the same movement. This guide therefore produces no automatic raise-or-lower target.
Record the existing saddle and component baseline separately before any authorized work. After a replacement, re-measure the named installed references and keep that observation distinct from the earlier catalogue estimate. Do not present a model-based candidate as an installed result or assume that returning one number guarantees the previous physical condition.
Crank length is a different geometric variable
Crank length concerns the distance from the crank axle to the pedal axle and the pedal's circular path. Pedal/shoe stack concerns a separation at the contact assembly. Both can change in the same replacement workflow, but they are not interchangeable inputs. A crank shortening does not document a shoe's upper surface, and a new cleat plate does not redefine the crank arm length.
The existing crank calculator compares identified crank lengths and its stated coupled saddle/top-of-stroke model. It is not a general shoe-stack solver, and the cleat assistant is not one either. If both the crank and contact assembly changed, keep two separate records rather than combining them into one unexplained correction and calling the original position restored.
Keep adapters, shims and clearances as physical checks
An approved adapter may be required to connect a shoe and cleat system. A manufacturer-specific plate or support can also be necessary to seat the cleat correctly. Those parts are not optional decoration in a stack illustration. Do not remove them, shorten bolts or improvise layers solely to chase a lower published number.
The exact assembly instructions own fastening, support, engagement, clearance and release checks. This article gives no universal torque, shim thickness or safe spacer count. A hardware combination can have a calculable height while remaining physically incompatible. If the required parts or predictable release cannot be established, stop the proposed trial and get the missing component-specific assessment.
Keep a before and after record that can be read
A useful comparison lists exact pedal, cleat, shoe and mounting parts on each date; named lower and upper endpoints; declared versus measured values; and any unresolved layer. Include the original reference photos and readings. A record saying lower stack by 3 mm without those details cannot tell a mechanic which part changed or whether the same point was compared.
Use the free blank worksheet for a paper inventory without entering a client or rider record into the application. The broader measurement guides help preserve repeated saddle and cockpit datums when those actual points are re-checked. A phone movement estimate is a separate observation with its own quality and condition limits; it cannot certify the stack assembly, installation or an individual benefit.
Practical questions
Frequently asked questions
Does pedal stack height include my shoe and insole?
Not necessarily. Check the stated endpoints and included mounting parts. A pedal/cleat figure is not automatically a pedal-axis-to-foot measurement including the sole and insole.
Should I move the saddle by the advertised stack difference?
This guide does not prescribe that. Catalogue subtraction may compare different endpoints or omit changed shoe layers. Preserve the physical baseline and re-measure the actual named references separately.
Can I remove a required adapter to lower stack?
No stack illustration authorizes removing required parts. Use the exact compatible assembly and current manufacturer instructions; support, bolt engagement and release remain physical checks.
Can the crank calculator calculate shoe-stack compensation?
No. Its existing model compares crank length and the stated coupled geometry. Keep pedal/shoe stack and crank length as separate variables rather than substituting one into the other's input.