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Motorcycle sag: measurement and calculator
This tool calculates motorcycle suspension measurement differences, not mountain-bike settings. Compare results with the instructions for your motorcycle, shock and spring.
Download rideXCalculate static and rider sag
Use a decimal point or comma. Example numbers are placeholders, not recommended settings.
Use consistent measuring points
For the rear, mark a point above the rear axle and measure to the axle. Use the same points, millimetres and the manufacturer's procedure for all readings. Have another person help support the motorcycle and take measurements safely.
The three lengths
L0 is measured with the suspension unloaded and extended on a suitable stand. L1 is the length with the motorcycle on its wheels without the rider. L2 is measured with the rider in full riding gear and the position specified by the manufacturer. Work on level ground and repeat the readings.
The calculations
Static sag = L0 − L1. Rider sag = L0 − L2. With example lengths of 600, 570 and 500 mm, the differences are 30 and 100 mm. These are sample calculations, not target values for your motorcycle.
Interpretation and setup
The calculator does not choose a spring rate, preload adjustment or suitable target range. Use your model's documentation or a suspension specialist. Keep the measurements, load and settings as a reference for the next comparable test.
Questions and answers
Why are my readings rejected?
Check that L0 is at least L1, and L1 at least L2. Use millimetres and the same measuring points.
What is the correct sag for enduro?
Use the values specified for your motorcycle and suspension. Do not transfer a target from another model or a mountain bike.
Sources and model-specific instructions
Use the document for your exact model and year. General examples do not replace its specifications.
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