ISO 24469:2023

Overview

ISO 24469:2023 - Road wear test of studded tyres - defines a laboratory/track test method to evaluate the wear that studded passenger-car and light-truck tyres cause to road surfaces. The method quantifies road damage by measuring the mass loss of prepared granite test stones after controlled vehicle passes, providing repeatable data for tyre development, regulatory assessment and pavement impact studies.

Key topics and technical requirements

• Test principle: Drive a test vehicle 200 times over the evaluation stone array (400 tyre passes) and derive road wear from the mass reduction of the evaluation stones.
• Test material: Kuru grey granite is specified for test stones; alternative materials require correlation testing.
• Test stones: Fifteen evaluation stones and five reference stones from the same production batch; individually numbered and used only once.
• Weighing procedure: Clean, dry in a convection oven at 110 °C ±1 °C for 72 h ±2 h, cool in a desiccator 120 min ±5 min (humidity <10 %), then weigh (test stone scale accuracy ±0,01 g; resolution 0,001 g).
• Stone mounting: Use a rigid stone tray and ground frame embedded flush with the track (stone top within +0,5 mm and 0 mm of track surface).
• Tyres and studs:
  • Two identical test tyres from the same batch, mounted on the driver’s side.
  • Stud protrusion measured per Clause 8; individual stud tolerance ±0,3 mm and average ±0,1 mm if a target protrusion is specified.
  • Tyre inflation pressures: passenger car tyres typically 250 kPa ±10; light truck tyres 350 kPa ±10 (adjust at ambient temperature before test).
• Test track and vehicle: Asphalt surface representative of public roads; standard production vehicle in good condition; track gradient and surface tolerances specified to ensure repeatability.
• Environmental and equipment requirements: Air temperature +2 °C to +20 °C; track temperature +2 °C to +25 °C. Measurement equipment (stud gauge, scales, thermometers, speedometer) must be calibrated and meet stated accuracies.

Applications and users

ISO 24469:2023 is intended for:

• Tyre manufacturers assessing stud designs and studded-tyre formulations for road abrasion.
• Pavement engineers and road authorities studying the impact of studded tyres on asphalt wear and lifecycle planning.
• Independent test laboratories performing product certification, comparative evaluations, or regulatory tests.
• Vehicle manufacturers and fleet operators evaluating tyre/pavement compatibility.

Practical uses include product development (minimizing road wear), compliance testing for national regulations on studded tyres, and quantifying pavement maintenance needs linked to studded-tyre use.

Related standards

• ISO 4000-1 - Passenger car tyres and rims (metric series)
• ISO 4209-1 - Truck and bus tyres and rims (metric series)
• ISO 4223-1 - Definitions of terms used in the tyre industry

For implementation or procurement, obtain the full ISO 24469:2023 text from ISO or your national standards body.