Overview
ISO 10191:2021 - "Passenger car tyres - Verifying tyre capabilities - Laboratory test methods" - is the international standard that specifies laboratory test methods to verify the capabilities of passenger car tyres. Published as the fourth edition (2021), it covers endurance tests, low-pressure performance tests, high‑speed tests, and requirements for bead unseating and tyre strength. Tests are carried out under controlled laboratory conditions and apply to all passenger car tyre constructions (radial, diagonal, bias-belted and T‑type temporary spares). The standard is intended for verification, not for grading or ranking tyre performance or quality levels.
Key topics and technical requirements
- Test scope by construction: Separate methods and requirements are provided for radial tyres versus diagonal/bias-belted and T‑type tyres; only the relevant tests for a tyre construction are required.
- Endurance testing: Controlled drum testing with specified loads, durations and inflation pressures (examples in the standard: 180 kPa for standard diagonal tyres, 220 kPa for reinforced/extra load, 360 kPa for T‑type spares). For diagonal/bias tyres endurance parameters include staged durations and loads (e.g., 4 h at 85 %, 6 h at 90 %, 24 h at 100 % of maximum load rating).
- High‑speed testing: Procedures and conditioning for validating tyre behaviour at elevated speeds; Annex A gives additional conditions for tyres without service description markings.
- Low‑pressure performance: Specific procedure for radial tyres to assess behaviour when run at reduced inflation pressure.
- Bead unseating & strength: Test methods reference ASTM standards for bead unseating and tyre strength verification.
- Test equipment & environment: Requirements for test drums (steel drums, nominal diameters 1.7 m or 2.0 m ±1 %), loading devices, inflation gauges (scale to ≥500 kPa), ambient conditioning (minimum temperatures), and allowance for PTFE coating of drums to avoid parasitic tread block chunking (PTBC).
Practical applications and users
Who uses ISO 10191:2021:
- Tyre manufacturers - product verification, durability and safety validation during development and pre‑production.
- Independent test laboratories - standardized lab methods for repeatable verification.
- Automotive OEMs - supplier verification for fitment and performance assurance.
- Regulatory bodies and certification agencies - technical reference for safety assessments.
- R&D and quality assurance teams - root‑cause analysis of failures (e.g., tread separation, bead separation, cord separation) and benchmarking against standardized test conditions.
Practical uses include endurance/durability assessment, speed rating validation, low‑pressure behavior checks, bead retention verification, and comparative laboratory verification of tyre capability.
Related standards
- ISO 4223-1:2017 - terminology for pneumatic tyres.
- ASTM F414 / ASTM F2663 - referenced test methods for energy absorption, bead unseating and strength.
- UN GTR No. 16 - alignment notes for radial tyre endurance and high‑speed tests included in the 2021 revision.
Keywords: ISO 10191:2021, passenger car tyres, laboratory test methods, endurance test, high‑speed test, low‑pressure performance, bead unseating, tyre strength, radial tyres, bias‑belted tyres.
