# CheckFitment

> Free wheel and tire fitment tools: bolt pattern, offset, backspacing, and per-vehicle specs. Check before you buy. Every vehicle specification is marked verified (two or more manufacturer sources) or unverified, with its sources listed; a vehicle that is not in the dataset is reported as not found, never guessed. Runs in the browser, no account.

The dataset covers 62 vehicles from 17 makes (Audi, BMW, Chevrolet, Dodge, Ford, GMC, Honda, Hyundai, Jeep, Kia, Mazda, Nissan, Ram, Subaru, Tesla, Toyota, Volkswagen). The same calculators are available to AI assistants through a public MCP server: https://checkfitment.com/ai-assistants/

## Tools

- [Bolt pattern finder](https://checkfitment.com/bolt-pattern-finder/): By year, make, model — or by pattern
- [Bolt pattern converter](https://checkfitment.com/bolt-pattern-converter/): mm ↔ inch, e.g. 5x114.3 = 5x4.5
- [Wheel offset calculator](https://checkfitment.com/wheel-offset-calculator/): Compare old vs new: poke, inner clearance, backspacing
- [Will these wheels fit?](https://checkfitment.com/will-these-wheels-fit/): Wheel + tire vs your clearance: fits, tight, or rub
- [Tire to rim width](https://checkfitment.com/tire-rim-width-calculator/): Which tire widths fit a rim — stretch, bulge, effective width
- [Wheel spacer calculator](https://checkfitment.com/wheel-spacer-calculator/): Effective offset, size needed, and stud-engagement safety check
- [Center bore check](https://checkfitment.com/center-bore-check/): Hub-centric, lug-centric, or won't fit — and which ring
- [Lug nut torque](https://checkfitment.com/lug-nut-torque/): Spec by vehicle in lb-ft and N·m, with tightening pattern
- [Bolt pattern measurement](https://checkfitment.com/bolt-pattern-measurement/): Tape measure to PCD — solves the 5-lug problem
- [Offset comparison](https://checkfitment.com/offset-comparison/): Compare 3 candidate wheels side by side
- [Backspacing ↔ offset](https://checkfitment.com/backspacing-calculator/): Convert between the two for any width
- [Plus sizing](https://checkfitment.com/plus-sizing-calculator/): Bigger wheels, same diameter — ranked tire sizes
- [Speedometer correction](https://checkfitment.com/speedometer-correction/): Actual speed vs shown after a tire size change, plus odometer error
- [Gear ratio after tire change](https://checkfitment.com/gear-ratio-after-tire-change/): What axle ratio your new tire size effectively behaves like, and RPM change
- [Regear calculator](https://checkfitment.com/regear-calculator/): Axle ratio needed to restore stock feel after a tire size change
- [Axle ratio calculator](https://checkfitment.com/axle-ratio-calculator/): Find your differential ratio from an RPM reading or driveshaft turns — no tag needed
- [Crawl ratio calculator](https://checkfitment.com/crawl-ratio-calculator/): Transfer case low range × 1st gear × axle ratio, for off-road control

## Vehicle fitment by make

- [Ford bolt pattern and wheel specs](https://checkfitment.com/fitment/ford/)
- [Ram bolt pattern and wheel specs](https://checkfitment.com/fitment/ram/)
- [Jeep bolt pattern and wheel specs](https://checkfitment.com/fitment/jeep/)
- [Chevrolet bolt pattern and wheel specs](https://checkfitment.com/fitment/chevrolet/)
- [Toyota bolt pattern and wheel specs](https://checkfitment.com/fitment/toyota/)
- [Dodge bolt pattern and wheel specs](https://checkfitment.com/fitment/dodge/)
- [Honda bolt pattern and wheel specs](https://checkfitment.com/fitment/honda/)
- [Nissan bolt pattern and wheel specs](https://checkfitment.com/fitment/nissan/)
- [Tesla bolt pattern and wheel specs](https://checkfitment.com/fitment/tesla/)
- [Subaru bolt pattern and wheel specs](https://checkfitment.com/fitment/subaru/)
- [BMW bolt pattern and wheel specs](https://checkfitment.com/fitment/bmw/)
- [Hyundai bolt pattern and wheel specs](https://checkfitment.com/fitment/hyundai/)

## Guides

- [How to measure a bolt pattern](https://checkfitment.com/guides/how-to-measure-bolt-pattern/): Tape or caliper to PCD — and why 5-lug needs math
- [Wheel offset explained](https://checkfitment.com/guides/wheel-offset-explained/): Positive vs negative, poke vs tuck, what a lower offset does
- [Backspacing vs offset](https://checkfitment.com/guides/backspacing-vs-offset/): Same geometry, two conventions — and the half inch that trips people up
- [Bolt pattern chart](https://checkfitment.com/guides/bolt-pattern-chart/): Every pattern in our database in mm and inches, by vehicle
- [Bolt pattern changes by year](https://checkfitment.com/guides/bolt-pattern-changes/): Which vehicles switched bolt pattern, and in which model year
- [What OEM manuals don't publish](https://checkfitment.com/guides/oem-wheel-spec-gaps/): Torque that differs by wheel material, specs that change mid-generation, and two fields no maker states

## About

- [About](https://checkfitment.com/about/)
- [How we verify](https://checkfitment.com/how-we-verify/)
- [AI assistants](https://checkfitment.com/ai-assistants/)
- [Privacy](https://checkfitment.com/privacy/)
- [Terms](https://checkfitment.com/terms/)