The result is a calculated estimate, not a lab measurement. The model simulates braking step by step: tyre grip at the given speed, ABS, air resistance, car weight and brakes.
Types of data on this site
OfficialEU tyre label (EPREL): wet grip, rolling resistance, noise, snow and ice symbols.
Independent testADAC, Tekniikan Maailma, UTAC — measured braking distances, with source and year.
CalculatedThis site's model for your car, speed and road conditions.
≈ EstimatedOur model's estimate for a property that hasn't been measured for this tyre (dry braking, braking in deep water, snow, ice) — based on the average for the tyre type.
Your inputCar, tyre size, speed, road conditions.
Assumptions
- Wet: wet asphalt, 1 mm water layer, +10 °C
- Dry: dry asphalt, +15 °C
- Snow: packed snow, −5 °C
- Ice: ice, −5 °C
- New tyre (8 mm), pressure as recommended by the manufacturer, driver in the car.
- Aquaplaning: the same new tyre, but with 3 mm of water on the road (ruts, a large puddle). A normal wet road is 1 mm.
- Reaction time is not included. The braking distance starts from the moment the brake is fully pressed. Reacting usually takes about 1 second — at 90 km/h that is another 25 metres before the car even starts to slow down.
- The car's factory sizes have been cross-checked online (tyre fitment and manufacturer sites) — there are usually 2–4 of them. The site suggests the most common one, but the exact size is on your tyre's sidewall.
- If no car is selected, the calculation uses a typical compact car (VW Golf 8).
Accuracy
- For tested tyres, grip comes from the measured result. Against measured braking distances, the model's average error on asphalt is 4.4%.
- For tyres with only a label, only the class (A–E) is known. The class grip is not the nominal midpoint of the range but the median of measured tyres in the same class (e.g. a regular class A summer tyre 1.47, a class A sports tyre 1.64). Tyres in the same class are equal in the model — in real life they differ by ±3–4%.
- On dry roads, snow and ice the label says nothing. On these surfaces only tested tyres are ranked.
Limitations
The model does not account for slush or braking in a bend. The range below the result shows the uncertainty.
Liability
The figures on this site are for general information and for comparing tyres. They are not a guarantee, an expert opinion or a basis for decisions on the road — always drive according to conditions. Terms of use and liability
Read the full methodology →