Transfer a bike fit between bikes: read the complete measurement record

Write which bicycle and which recorded occasion each set of values describes. Source means the record you are considering as a reference, not the better bicycle or a clinically validated position. Target means the separately described bicycle being compared, not a collection of automatically approved settings. Preserve its original observations even if you later make a deliberate plan. Without that baseline, a return to an earlier state becomes another assumption rather than a documented comparison.

Keep the measuring occasion separate from a component catalogue. A printed frame chart, a stem marking, a saved observation and a proposed value can all use millimetres, but they describe different evidence. Record whether an entry was actually observed, copied from a named specification or left unresolved. Do not replace a target observation with the source simply because the source record is more complete. A complete-looking sheet assembled from both bicycles is not an independent baseline for either.

Packet A shows every field used by the existing complete-setup comparison, not only the numbers convenient to copy. The source and target have coherent written references and explicitly fictional confirmations. Seven rows describe contact quantities; eight retain component or frame context. All fifteen numerical source and target declarations stay visible beside their units and the returned difference. The two zero differences are actual zeros in this fictional arithmetic, not replacements for missing information.

Read the role label before the value. A comparable declaration means the software has enough stated information to subtract these entries under its rules. Numerically equal means that subtraction is zero. Neither says that an instrument was accurate, the bicycle was level, the source is suitable or the target is physically attainable. The whole packet remains an educational example even where the app returns a technically available difference. A caption or badge must not promote that arithmetic into an installation decision.

Crank length, head angle, spacer height, bar width, stem length, stem angle, frame stack and frame reach are the eight context rows in this packet. They help explain why two bicycles with related contact numbers are still different assemblies. For example, A records different frame stack and reach without making either one a transferable target. A frame dimension is not a movable control, and a component difference does not establish that another part would be compatible.

The context rows retain arithmetic where the existing comparison permits it, including the equal stem-angle declarations. They are not silently discarded because they are not selectable contact steps. Nor do the seven contact rows become physical instructions simply because the application can offer them in a separate deliberate plan. Keep description, model, proposal, installed observation and later re-check as distinct records. A numerical context difference may be a useful question for a qualified mechanic or fitter, not an automatic shopping list.

Packet C uses exactly the values and written definitions from A but supplies none of the required reference confirmations. One shared spatial confirmation and three detail confirmations cover the seven contact fields. The existing rules withhold those seven contact differences. Raw values remain readable, including the equal saddle-tilt numbers; equal values do not provide the absent confirmation. The eight context comparisons remain available because the contact attestations are not their input. A ready outer packet therefore does not mean every row can be used for a contact comparison.

A confirmation is a statement made in the workflow, not an instrument reading or independent audit. It cannot make inaccurate observations accurate. Conversely, the absence of a confirmation does not prove that the bicycles differ physically; it limits what this software is prepared to present. Keep that distinction when reading an older record, an imported file or a colleague’s report. Do not infer a missing statement from a familiar component photograph, a matching profile name or another successful task elsewhere in the application.

The fictional crank lengths are 170 and 172.5 mm. That difference is component context, not a reason to compensate the saddle automatically. A separate crank-geometry model can state conditional relationships, but this reading packet does not run that model or establish its physical assumptions. It also does not show shoe, pedal or cleat dimensions, loaded contact behaviour or an independent rider assessment. No single correction can be inferred to close all those missing observations.

Likewise, a different bar width or stem length is not permission to swap parts. Exact model compatibility, marked limits, routing, condition and installation requirements belong to the relevant manufacturer instructions and competent physical review. Use the specialised field guides to understand the terms, not as substitutes for those exact documents. A question such as which point does this reach value describe is useful before a transfer; a generic instruction to reproduce every number is not a verified answer.

A plan is a description of intended work. A recorded installation statement is another declaration, and a later measurement is an observation under its own method. Neither should be inferred from a comparison badge. The existing staged transfer workflow keeps its mechanical review and repeated re-check requirements; this article changes none of them. Read any named product matching window as a software criterion, not a guarantee about instrument accuracy, physical safety, comfort or suitability.

Repeated readings can expose variation but do not remove a shared mistake in the point or method. Preserve the individual readings and their reference rather than rounding away disagreement to make a target appear met. A keep, revert or stop record belongs to its actual occasion and scope. It is not a universal approval of the source position or a claim about a rider’s health. Resolve missing evidence or obtain appropriate human review instead of treating no available comparison as no problem.