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Declare the exact current hardware and datums
Record the bike, fork, steerer, stem, handlebar, headset reference, compression device and exact manuals. Freeze one bar-reach datum, one bar-drop datum and one bike-leveling method.
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Free local cockpit workflow
Declare the exact installed hardware and one reversible change. See the signed modeled bar-clamp X/Y delta, pass every installation gate, then close the trial after two or three rides using repeated physical bar-reach and bar-drop measurements.
The geometry is not a measurement, fit target or permission to alter a steerer assembly. This page provides no universal torque. Every flip, stem swap, move above the 5 mm product cap and uncertain hardware arrangement is a mechanic handoff.
Bike-linked cockpit trial
Choose a bike to require an exact match with its measured baseline and save plan → installation → repeated re-check atomically. Choose standalone mode to calculate without persistent history.
Step 1 · declared hardware and baseline
Name the installed parts and measurement datums. The coordinate model starts at the steerer reference and ends at the bar-clamp centre; it does not measure your hand position.
Modeled result
Declare the exact current parts, physical references and one candidate arrangement. Installation remains locked after the math.
Model, install, measure
The baseline reach/drop and installed candidate reach/drop stay separate. A final keep is checked against the candidate; a final revert is checked against the restored baseline. Neither can be replaced by the coordinate model.
Record the bike, fork, steerer, stem, handlebar, headset reference, compression device and exact manuals. Freeze one bar-reach datum, one bar-drop datum and one bike-leveling method.
Move existing spacers in one direction, or enter an exact candidate stem flip or swap. A spacer move above the 5 mm product cap, any uncertainty, every flip and every swap routes to a qualified mechanic.
The result reports candidate minus current at the bar-clamp centre: positive X is forward and positive Y is up. Real bar rotation, stack details, routing and hand contact are not fully modeled.
Freeze the actually measured candidate reach and drop, then verify the exact manuals, compatibility, compression device, steerer clamp coverage, torque sequence, routing, free steering and brake and shift function.
Repeat actual bar reach and drop twice. A pair more than 5 mm apart requires a fresh third reading. Keep must match the frozen candidate; revert must match the frozen baseline, each within ±5 mm.
Coordinate model
Spacer height travels up and back along the head angle. Stem length travels along the measured stem centreline angle. Candidate minus current gives signed X and Y at the bar-clamp centre; saddle-to-bar drop change is the negative of modeled clamp Y when the saddle reference is unchanged.
Model boundary
The model does not fully include top-cover and stem stack, compression gaps, bar rotation, hood placement, flex or real cable and hose routing. Final actual reach/drop can differ; that difference is shown, not hidden or turned into an accuracy score.
Official manufacturer sources
These manufacturer pages illustrate why a generic spacer, compression-plug or torque rule is unsafe. They apply only when the named bicycle and components match; otherwise locate the exact current manual or use a qualified mechanic.
Trek owner guidance
Trek separates direct-connect and quill stems and directs the owner to the correct stem-specific tightening and carbon-steerer precautions.
Open Trek's stem guidanceTrek product-specific manual
The official manual ties spacer position, expander installation, clamp engagement, cable routing and steering checks to one specific cockpit system.
Open the Aeolus RSL manualCanyon bicycle manual
Canyon's road manual shows that spacer retention, cable and hose paths, headset checks and service-only assemblies can depend on the exact bicycle design.
Open Canyon's road manualStop conditions override the model
Stop for a moving clamp, headset play, restricted steering, tight routing, damaged parts or incomplete brake or shift function. Severe or worsening pain, persistent numbness, sudden weakness, circulation warning signs, instability or loss of control also stop fitting and need appropriate qualified help.
Use the broader calculator for component comparisons, save the exact bicycle setup, or return to the tool index. Keep one mechanical trial open at a time.