Overview
ISO 10454:2025 - "Truck and bus tyres - Verifying tyre capabilities - Laboratory test methods" defines laboratory procedures to verify the structural and performance capabilities of truck and bus tyres. The standard applies to all truck and bus tyres and specifies which test methods are appropriate depending on tyre type (strength test, endurance test, high‑speed performance test for LT/C tyres). It does not provide a system for grading tyre performance or quality levels.
Key topics and technical requirements
- Scope and terminology: Uses tyre industry definitions from ISO 4223‑1 (e.g., bead separation, ply separation, speed symbol). Applicable to tyres marked with speed symbols (E, F, G … H) and load indices.
- Test equipment
- Test drum: smooth steel cylindrical drum, typically 1.7 m ±1% or 2.0 m ±1% diameter; larger diameters allowed for endurance tests. Drum width must meet or exceed tyre overall width.
- Plunger: cylindrical steel plunger with hemispherical end. Diameters per load index: ≤121 → 19 mm; 122–134 → 32 mm; ≥135 → 38 mm.
- Inflation pressure gauges: scale at least 100 kPa above test pressure; specified accuracy.
- Strength test (tread breaking energy)
- Tyre mounted on test rim and inflated to minimum pressure for maximum single‑formation load.
- Plunger forced into tread at 50 mm/min ± 2.5 mm/min at five circumferential points.
- Breaking energy W (joules) computed as W = (F × P) / 2000, where F = force (N) and P = penetration (mm); tyre average from test points.
- Endurance test (speed category ≤ 150 km/h)
- Assesses resistance under full load and moderate sustained speed; not applicable to LT/C tyres.
- Test parameters (speed, load percentages, durations) are given in tabulated form (Table 3) and depend on maximum load rating and speed symbol. Ambient temperature and load/pressure control requirements specified.
- High‑speed performance test for LT/C tyres (light‑truck/commercial) is addressed separately (Clause 5.3) with conditions depending on speed category.
Applications - who uses ISO 10454:2025
- Tyre manufacturers - product development, validation of structural strength and endurance.
- Independent testing laboratories - reproducible laboratory verification of truck and bus tyre capabilities.
- Regulatory and conformity bodies - verifying compliance with laboratory performance requirements.
- Fleet operators and OEMs - technical due diligence for tyre procurement and safety assessments.
Related standards
- ISO 4223‑1 - Definitions of tyre industry terms (normative reference).
- ISO 4209‑1 - Truck and bus tyres and rims (metric series).
- Prepared by ISO/TC 31 (Tyres, rims and valves), Subcommittee SC 4.
Keywords: ISO 10454:2025, truck and bus tyres, tyre laboratory test methods, strength test, endurance test, high‑speed performance, LT/C tyres, test drum, breaking energy, speed symbol.
