Tire sizes answered
with math, not guesswork.
171,100 OEM and alternative tire fitments from 160 manufacturers — with computed geometry for every size and alternate sizes validated against the industry ±3% diameter rule. In the workspace, the Tire Finder and the REST API.
Free plan includes the full workspace + 100 API calls/mo.
Answer "will it fit?" both directions
From a vehicle to its tires, from a tire size to every vehicle it fits, and from a DOT code to the tire's age and recalls.
Tire Finder wizard
- Pick make, model and year — get the OEM tire size instantly
- Compatible alternatives and plus-sizing options included
- Covers 160 makes from 0 to 2027 with trim-level accuracy
- Save results to your lists for future reference
Reverse tire search
- Start from a size like 235/45R18 — see every vehicle it fits
- OEM and alternative fitments cross-referenced with the car database
- Ideal for pricing tires across shared vehicle fitments
- Search-as-you-type size suggestions
Computed geometry, every size
- Overall diameter, sidewall height, circumference and revs per mile
- Pure math from the size string — works for any size, not just listed ones
- Alternate sizes validated against the ±3% diameter rule
- Decode width, aspect ratio and wheel diameter from e.g. 235/45R18
Full database workspace
- Browse all 171,100 fitment entries with advanced filters
- Filter by make, model, year, OEM size and alternative sizes
- Export your shortlist to CSV for price lists
- Saved searches with email alerts for new fitments
Tire DOT Code Lookup
- Type the code after "DOT" on the sidewall, e.g. DOT U2LL LMLR 2219
- Build week and year, so you know how old the tire is
- The plant that made it, decoded from its plant code
- NHTSA tire recalls whose production windows cover that plant and week
Tire recalls by size
- Tire size pages in the workspace list the NHTSA tire recalls that name the OEM size
- Brands, tire lines, plants and production windows from each notice
- Windows read from the recall text, so a DOT code can be checked against them
- GET /v1/tire-sizes/{uuid}/recalls returns the same list as JSON
Fitment validation,
as an endpoint.
A tire size like 235/45R18 encodes width (235 mm), aspect ratio (45%) and wheel diameter (18 in). VehDB computes the rest — and flags any alternate size whose overall diameter drifts more than ±3% from OEM, so your shop, store or claims tool never recommends a bad fit.
- GET /v1/tire-sizes/{uuid}/geometry — diameter, sidewall, revs/mile, diameter deltas
- GET /v1/cars/{uuid}/tire-sizes — every tire that fits a given car
- GET /v1/tire-sizes/dot/{tin} — plant, build week, age and the NHTSA tire recalls that cover them
- GET /v1/tire-sizes/{uuid}/recalls — NHTSA tire recalls naming the OEM size
- OEM and alternative sizes per vehicle, plus-sizing included
- Same Bearer token and quota as the rest of the API — free tier included
Browse tire sizes by manufacturer
160 vehicle makes with fitment data — these have the most entries.
One platform, four datasets
Tire fitments cross-reference the car database — motorcycles and power boats live in the same workspace and API.
Cars
Sedans, SUVs, trucks and more — with EPA fuel economy and NHTSA recall enrichment.
Explore →Motorcycles
Sport bikes, cruisers, touring, adventure and more — by make, model, year and type.
Explore →Power boats
Marine vessels with length, horsepower, hull type and fuel specifications.
Explore →This data is a platform, not just a page
Everything here is available through the REST API and an MCP server — pull it into your apps, or let your AI agents use it as native tools. The lists your team curates is reachable the same way. One token, one quota.
Find the right fit across 171,100+ tire fitments.
Create a free account for the Tire Finder, reverse search and computed geometry, plus 100 API calls a month. No card required.
100 free API calls every month · REST API + MCP server on every plan · No card to start · See pricing