1
Choose angle or height
Use one axis for the whole trial. For angle, declare the hood surface and positive direction relative to horizontal. For height, declare the hood point and fixed datum.
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Free local cockpit tool
Measure one axis on both hoods twice, choose a small direction yourself, and receive exact left/right targets plus the values needed to reverse the trial. Finish with two or three rides and the same repeated measurement.
The assistant does not choose a direction from symptoms, prescribe an ideal hood angle or provide a universal torque. Every number stays in this page. The exact lever and handlebar instructions always control clamp parts, supported position, torque and tightening sequence.
Local bike hand-off
The calculator works without a profile. Choosing a bike also stores the exact left/right baseline, target, declared reference and later repeated re-check in local IndexedDB.
Step 1 · repeatable L/R baseline
Choose angle or height, never both in one trial. Use the same marked point on each hood, the same datum and the same leveling method. Lift and replace the tool between readings.
Baseline status
Two readings per side are required. A pair more than the stated threshold apart opens one fresh third reading. An unstable triplet fails closed.
Repeatability before movement
Hood shapes differ, so an angle or height number is only comparable when its marked surface, datum and leveling method stay fixed. The workflow exposes measurement spread and preserves the original L/R values.
Use one axis for the whole trial. For angle, declare the hood surface and positive direction relative to horizontal. For height, declare the hood point and fixed datum.
Record the exact L/R surface or point, datum and bike/tool leveling method. Keep them unchanged through the final re-check.
Lift and replace the tool between two readings on each side. A pair more than 1 degree apart for angle or 3 mm apart for height requires one fresh third reading; an unstable triplet fails closed.
Choose left, right or both, then choose the direction and one 0.5-2.0 degree or 1-5 mm step. These are product caps, not fit ranges. Use the exact component instructions and pass every mechanical gate before riding.
Repeat the same L/R measurement, verify clamp security, hose and housing paths, brake and shift function and the declared symmetry, then record keep, revert or stop.
What is exact
The arithmetic adds or subtracts the chosen step from the resolved L/R baseline. It also preserves right-minus-left and the exact original values needed to reverse the single change.
What is not inferred
Control shape, handlebar geometry, routing and rider needs vary. The product cap only bounds one reversible workflow; it is not a fit range, diagnosis or component specification.
Official manufacturer sources
These official pages demonstrate why lever installation, hose or housing checks and clamp verification are model-specific. They are examples, not permission to copy a torque value to another lever or bar.
Shimano dealer manual
Shimano publishes model-group installation details and connection checks. Match your exact product before touching the clamp.
Open Shimano's manualSRAM product-family manual
SRAM's Apex documentation shows family-specific clamp installation and a no-movement verification. Use only the instructions matching your parts.
Open SRAM's Apex manualSRAM service hub
The official model hub keeps manuals and service material tied to a specific family. Confirm the actual model or serial before using them.
Open SRAM's model hubSave the baseline, move only the declared hood axis, and use the same L/R references for the final re-check. Stop if a control moves, routing becomes tight or braking or shifting is not fully functional. Severe or worsening pain, persistent numbness, sudden weakness or circulation warning signs also stop fitting and need appropriate qualified help.