Tyre size by reg API — manufacturer fitment, pressures and load ratings
Manufacturer tyre sizes, pressures and load ratings by registration.
Also known as: tyre size by reg · find tyre size by reg · check tyre size by reg · tyre size lookup · tyre fitment
Overview
Find tyre size by reg without reading a sidewall. Send a registration and get the manufacturer fitment for that vehicle: width, aspect ratio and rim diameter, the load and speed ratings, and the recommended pressures: front and rear separately where they differ.
Staggered fitments, run-flats and optional wheel sizes are what catch out a model-level lookup, and they are exactly where a per-vehicle answer earns its keep.
Built for tyre retailers and fitment flows that start from a number plate.
Features
- Front and rear tyre sizes
- Recommended pressures
- Speed and load ratings
Example response
A successful lookup for AB12CDE. Illustrative values.
{
"data": {
"vrm": "AB12CDE",
"tyres": {
"front": {
"size": "215/50R17",
"pressure_psi": 33,
"load_index": "95",
"speed_rating": "V"
},
"rear": {
"size": "215/50R17",
"pressure_psi": 33,
"load_index": "95",
"speed_rating": "V"
}
}
},
"credit_balance": 499
}
Fields returned
| Field | Type | Description |
|---|---|---|
| tyres.front.size | string | Front tyre size. |
| tyres.front.pressure_psi | integer | Recommended front pressure (psi). |
| tyres.rear.size | string | Rear tyre size. |
| tyres.rear.pressure_psi | integer | Recommended rear pressure (psi). |
| tyres.*.load_index | string | Tyre load index. |
| tyres.*.speed_rating | string | Tyre speed rating. |
- How do I find tyre size by reg?
-
Send the registration. The response gives the manufacturer fitment for that vehicle: width, aspect ratio and rim diameter, plus load and speed ratings, without anyone having to read it off the sidewall.
- What if the front and rear tyres differ?
-
They are returned separately. Staggered fitments are common on performance and rear-wheel-drive vehicles, and a single-size answer is wrong for them.
- Does it cover optional wheel sizes?
-
Where the manufacturer offered more than one wheel size, the fitment is returned against the vehicle rather than the model, so an optional larger wheel is reflected if that is what was specified.
Who uses this
You might also need
Official registers
Vehicle records from the DVLA Vehicle Enquiry Service, MOT records from the DVSA MOT History API.
Charged on delivery
You are charged on a successful lookup. A lookup that returns nothing costs nothing.
No lock-in
No contract and no minimum. Credits last 12 months; monthly plans are rolling.
UK data protection
You act as controller and we act as processor for delivery, under the UK GDPR and the Data Protection Act 2018.
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Read the guide → Free toolTyre size by reg
See the manufacturer tyre fitment, load and speed ratings and pressures for a vehicle.
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