Coil spring rate calculator for eMTBs

Most coil calculators ask you to guess your bike's leverage ratio and ignore the bike entirely. This one already knows your bike.

Get your spring rate

Pick your bike and we already know its travel, shock stroke, weight and geometry.

Balanced = all-round trail riding

No signup needed. Free to use.

Why this one is different

  • Real leverage ratio, computed for you. Rear travel from the verified spec divided by your shock's actual stroke. No guessing.
  • The bike's own mass counts. An eMTB puts 15kg or more of itself on the rear wheel. Every generic calculator ignores this, which is the biggest single error on an e-bike.
  • Your frame size matters. Weight distribution comes from your size's real wheelbase and chainstay, so an XL and a Small get different rates, correctly.
  • Practical output. The spring to buy in 25lb increments, an alternative, sag in millimetres, and the preload rule (more than two turns means the next rate up).

Open the setup calculator →

Pick your bike and trim; if your trim ships a coil shock the spring recommendation appears automatically. Running a coil conversion on an air-specced bike? Pick your bike, then choose your coil shock from the component picker: the bike's leverage ratio and mass still apply.

No bike handy? Quick calculator

Manual mode for any bike, analog included. Stroke is the second number in a shock size like 230x65.

Coil-equipped eMTBs we cover

62 bikes have at least one build that ships a coil shock from the factory; the trims are named so you know which. Each link opens that bike's setup page with spring rates by rider weight.

Learn more

EMTB Forums Bike Finder · gold-DB rich spec + community-verified · 2026
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