Niche Tools Program

Specific calculators, planners, and explainers for jobs that usually get buried in forums.

HTML-first, no account wall Shareable URLs and direct outputs

Motorbikes

Motorcycle suspension sag planner

Measure front and rear suspension sag properly, compare the result against bike-type target ranges, and get a practical starting read on preload direction and spring-rate clues.

Planner

Results update instantly. Use the button only if you want a shareable URL for the setup below.

Setup profile

Front measurements

Measure from full extension, then with the bike resting under its own weight, then with the rider in position.

Rear measurements

Use the same points each time. A helper holding the bike upright makes the rider measurement far more reliable.

Why this page exists

Sag setup advice is usually scattered across forum threads, race-shop PDFs, and static charts. That is fine if you already know the workflow. It is much less helpful when you are trying to decide whether your numbers mainly point to preload adjustment or to the wrong spring.

  • Built for searches like motorcycle sag calculator, how much rider sag, and rear static sag too much.
  • Shows front and rear together instead of forcing you to jump between separate rules of thumb.
  • Uses target ranges as setup starting points, not as hard universal truths for every bike and rider.

Measurement notes

  • Static sag here means full extension minus bike-only measurement.
  • Rider sag means full extension minus rider-on-bike measurement.
  • If rider sag is deep but static sag is tiny, you are often using a lot of preload to prop up a spring that is still too soft.
  • If rider sag is shallow while static sag stays large, the spring may be too stiff for the load even if preload can hit the target number.

Try a few adjacent pages while you are here.