Motorcycle static sag worksheet calculator

Calculate bike-only static sag and rider sag with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use bike-only static sag and rider sag to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Fully extended suspension reference measurement (mm)
600
Bike-only settled measurement (mm)
580
Rider-loaded settled measurement (mm)
550
User-supplied reference suspension travel (mm)
150
Bike-only static sag (mm)
20
Rider sag (mm)
50
Static sag fraction of supplied travel (%)
13.333333
Rider sag fraction of supplied travel (%)
33.333333

Try another scenario

Fully extended suspension reference measurement (mm)
600
Bike-only settled measurement (mm)
580
Rider-loaded settled measurement (mm)
540
User-supplied reference suspension travel (mm)
150
Bike-only static sag (mm)
20
Rider sag (mm)
60
Static sag fraction of supplied travel (%)
13.333333
Rider sag fraction of supplied travel (%)
40
Calculation method

Calculation method

Bike-only static sag (mm)

extended-bikeOnly.

Rider sag (mm)

extended-riderLoaded.

Static sag fraction of supplied travel (%)

100*staticSag/travel.

Rider sag fraction of supplied travel (%)

100*riderSag/travel.

Symbols and units
a
Fully extended suspension reference measurement (mm)
b
Bike-only settled measurement (mm)
c
Rider-loaded settled measurement (mm)
d
User-supplied reference suspension travel (mm)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Measurement differences using one consistent reference axis; percentages are descriptive. No preferred sag range, preload setting or handling/safety recommendation. Supported limits: extended>=bikeOnly>=riderLoaded>=0; travel>0; measurements not necessarily equal actual wheel travel unless same axis.
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