Suspension Sag Calculator
Calculate free and rider sag for spring rate selection.
Inputs
mm
mm
mm
mm
Results
Rider Sag
36 mm
Rider Sag
30%
Static Sag10 mm
Static Sag8.3%
Ideal Sag Range30-40 mm
Difference from Ideal0 mm
Remaining Travel84 mm
Remaining Travel70%
RecommendationSpring rate is good
How to Use This Calculator
- Enter Total Suspension Travel, Fully Extended Length, and Unladen Length.
- Set Rider Length.
- Review Rider Sag (mm) and Rider Sag (%).
- Use Static Sag (mm) and Static Sag (%) to inform your decision.
How the result changes with Fully Extended Length
| Fully Extended Length | Rider Sag | Rider Sag |
|---|---|---|
| 260 | -204 mm | -170% |
| 410 | -54 mm | -45% |
| 590 | 126 mm | 105% |
| 740 | 276 mm | 230% |
What each input means
- Total Suspension Travel
- Maximum suspension travel from fully extended to fully compressed.
- Fully Extended Length
- Measurement from axle to reference point with wheel off the ground.
- Unladen Length
- Same measurement with bike on ground, no rider.
- Rider Length
- Same measurement with rider seated in normal riding position.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersTotal Suspension Travel = 120, Fully Extended Length = 500, Unladen Length = 490, Rider Length = 464 = 4 input(s) provided
- Calculate Rider SagRider Sag36 = 36
- Calculate Rider SagRider Sag30 = 30
- Calculate Static SagStatic Sag10 = 10
- Calculate Static SagStatic Sag8.3 = 8.3
Engine last updated . Checked against 1 independently-derived test — how we verify calculators.
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