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, or from a tire size to every vehicle it fits.
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 1989 to 2025 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 filtered result sets to CSV for price lists
- Saved searches with email alerts for new fitments
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
- 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.