What the Wheel Fitment API returns
Every request returns a complete fitment record — vehicle identity, factory and aftermarket tire / wheel sizes, mounting geometry, torque specs, and seasonal upgrade data. The fields below are available for 60,000+ modifications across 200+ makes in all 14 global regions.
Full fitment coverage
OE + aftermarket
Region-aware
Vehicle identity
Who the vehicle is — make, model, year, region, generation, trim.
- Vehicle description and attributes
- Make, model, year, body type, doors, and platform metadata — the structured identity of each modification returned by the API.
- Vehicle generation & production years
- Generation code and production start / end years — distinguishes facelifts and chassis changes that affect fitment within the same nameplate.
- Vehicle region
- Market the vehicle was officially sold in — one of our 14 regions (USDM, EUDM, JDM, and more). The same model may carry different factory fitments by region. See the full region list →
- Trim levels & options
- Trim name and option packages that influence factory wheel / tire choices — sport, offroad, and performance variants typically ship different fitments.
- Vehicle images
- Reference photography for each generation — useful for visual confirmation when a user is picking a vehicle in your UI. Returned as hosted image URLs.
Powertrain
Engine and performance specs that correlate with OE tire / wheel selection.
- Power
- Engine output in horsepower and kilowatts — important for load-index and speed-rating calculations on high-performance variants.
- Engine type, fuel type, engine code
- Displacement, fuel (petrol, diesel, hybrid, EV, LPG), and manufacturer engine code — lets you disambiguate fitments across engine options within a single trim.
Tire & wheel fitment
The core of the API — factory and aftermarket sizes, plus all the markers your catalog needs.
- Original Equipment (OE) tire & wheel fitment
- Factory-fitted tire and rim sizes for passenger cars and light commercial vehicles (LCVs) — the spec as delivered by the manufacturer.
- Aftermarket & manufacturer-optional sizes
- All additional tire and wheel sizes approved by the manufacturer or commonly fitted in the aftermarket — typically multiple alternatives per modification.
- Load index & speed rating
- Maximum load capacity and speed rating codes (e.g.,
94V,102H) per tire size — required for safe replacement matching. - Offset (ET)
- Distance in millimetres from the hub mounting face to the wheel centerline. Critical for clearance and stance calculations — available on every wheel record.
- Fitment markers — run-flat, commercial, steel, winter
- Per-size boolean flags: run-flat tires, commercial tires (reinforced / LT), steel rims, and the recommended-for-winter flag. Lets you filter or label catalog rows without extra joins.
Mounting & torque specs
Everything a fitment calculator needs to verify wheel-to-hub compatibility.
- Center bore
- Hub bore diameter in millimetres — determines whether a wheel sits hub-centric or needs a centering ring.
- Thread size
- Lug / bolt thread spec (e.g.,
M14x1.5,M12x1.25) — required to source correct fasteners. - Wheel fasteners (lock type)
- Fastener type per vehicle — lug nuts or bolts. Some premium aftermarket wheels require a specific type.
- Wheel torque tightening
- Manufacturer-recommended torque (Nm and lb-ft) for tightening lug nuts / bolts. Surface this in service UIs and installer-facing tooling.
- Tire pressure
- OEM front / rear cold-tire pressures in bar and PSI — often varies by load condition and tire size.
Upgrades & seasonal
Plus-sizing and winter-downsizing data — purpose-built for tire retailers and configurators.
- Aftermarket upsteps (wheel + tire)
- Recommended plus-size progressions (+1, +2, +3) pairing wheel diameter increases with matching tire sizes that preserve overall rolling diameter.
- Winter-wheel downsizing
- Suggested smaller diameter / narrower tire combinations for winter use — preserves speedometer accuracy while improving snow traction and reducing cost.
Ready to integrate?
These fields are available on every plan — including the free Sandbox. See the endpoint reference or start a free trial.