Tire Fitment Checklist Generator
Make a list of what to check before you buy. Use the calculator below. Results update as you type.
How the Tire Fitment Checklist Generator Works
This generator works by listing every measurement and specification needed for a tire or wheel change, with the unit, the source and the pass rule. It turns a fitment project into a checklist.
- Enter the current and planned tire and wheel.
- Generate the checklist.
- Fill in each measurement on the vehicle.
- Mark each item pass or fail against its rule.
The Formula
The formula is Ready = all items pass, where each item has its own rule.
Ready = Pass_1 AND Pass_2 AND … AND Pass_12 Diameter Rule: |ΔD| ≤ 3% Load Rule: LI_new ≥ LI_OEM Brake Rule: Clearance ≥ 3 mmWorked example: a setup that passes 11 items but fails the center bore item is not ready until a hub-centric ring is added.
Conversion Table
The conversion table lists 12 checklist items with unit, source and pass rule. Items cover the tire (size, load, speed), the wheel (width, offset, bolts, bore) and the vehicle (brakes, fender, strut, TPMS).
Print the table and take it to the vehicle. Fill each row with a measured value.
| Item | Unit | Where to Find or Measure | Pass Rule |
|---|---|---|---|
| Tire size | W/AR R Rim | Sidewall / placard | Matches plan |
| Overall diameter change | % / in | Calculator | Within ±3% |
| Load index | kg / lb | Sidewall | ≥ OEM |
| Speed rating | km/h / mph | Sidewall | ≥ OEM (or legal minimum) |
| Rim width | in | Wheel stamp | In approved range |
| Offset | mm | Wheel stamp (ET) | Inner and outer clear |
| Bolt pattern | lugs × mm | Wheel / hub | Exact match |
| Center bore | mm | Wheel / hub | ≥ hub, ring if larger |
| Brake clearance | mm | Template | ≥ 3 mm gap |
| Fender gap | in / mm | Tape at arch | No contact at full lock and bump |
| Strut gap | mm | Feeler or ruler | ≥ 5 mm |
| TPMS | MHz | Sensor label | Matches vehicle |
What Is the Tire Fitment Checklist Generator?
The Tire Fitment Checklist Generator is a tool that organizes required measurements and specifications for a tire or wheel change. It prevents missed checks, which cause most fitment returns.
The checklist works for daily drivers, lifted trucks and track cars. Each project fills the same 12 rows with its own values.
Common Uses
This generator has 4 uses: shop intake, DIY planning, inspection records and customer sign-off.
- Run shop intake: Collect fitment data at the counter.
- Plan DIY changes: Check every item at home.
- Keep inspection records: File the completed checklist.
- Get customer sign-off: Record the agreed setup.