FREE FITMENT & STANCE CALCULATORS
Stop guessing. Every tool here is built for the people who actually care — the ones who measure twice before pulling the trigger on wheels, coilovers, or a tyre order. Free, fast, no signup.
The big one. Enter your car, suspension setup, and target wheels — get a full fitment verdict: clearances, recommended spacers, camber requirements, and whether your setup is daily-safe or show-only.
JDM and Euro specs use ET. American brands use backspacing. Convert instantly in both directions — get the full breakdown including lip depth and hub centreline position.
Know your stretch rating before you order. Enter wheel width, tyre width, and aspect ratio to calculate stretch amount, sidewall angle, and safety classification — with a live cross-section diagram.
Not all spring rates are equal. Calculate the correct spring rate for your corner weight and motion ratio, with ride-frequency targets and damper guidance for street, track, and show builds.
Side-by-side visual comparison of two tyre sizes — scaled diagram showing diameter difference, sidewall height, and how much the speedo drifts. Pick your tyre upgrade with confidence.
WHY CALCULATORS?
Because the forums have 47 pages of contradictory advice and the wheel shop wants to sell you whatever they have in stock. The measurements don’t lie. Get the numbers right once, and every purchase decision after that is made with confidence instead of hope.
Every tool here is built by people who’ve been through the process — measured wrong, bought wrong, regretted it, and learned. The calculators are the shortcut we wish we’d had.
FREQUENTLY ASKED QUESTIONS
Are these tools accurate?
The calculations are mathematically correct. Real-world fitment adds variables no calculator can account for — suspension geometry, camber settings, strut shape, individual car tolerances. Use the numbers as your starting point, then verify clearances physically before buying.
Do I need to create an account?
No. All tools are free and require no signup. Everything runs in your browser — nothing is sent to a server.
What’s the Wheel Fitment Calculator?
It’s the main event — a comprehensive tool that takes your car, suspension configuration, ride height, and target wheel/tyre specs and gives you a full fitment verdict. Clearance estimates, spacer recommendations, camber requirements. It’s the tool this whole site is building toward.
Can I suggest a tool?
Yes. If there’s a calculation you do by hand or approximation that you’d want automated, reach out on the About page.