Overview
ISO 17269:2000 - "Passenger car tyres - Methods for measuring rolling circumference - Loaded new tyres" describes standardized laboratory and on-road procedures to measure the rolling circumference and revolutions per unit distance of new passenger‑car tyres under loaded conditions. The document defines two complementary methods: a controlled drum method (tyre pressed against a driven road drum) and a vehicle test method (drive-axle tyres driven over a measured straight road). Results are intended for measurement consistency and correlation, not as performance or quality benchmarks.
Key topics and technical requirements
- Two test methods
- Drum method: test tyre mounted on a free axle is loaded against a driven drum (minimum diameter 1.20 m). Drum surface should be smooth steel (textured surfaces must be reported). Drum width must exceed tyre tread width.
- Vehicle method: representative vehicle fitted with test tyres on the drive axle is driven at constant speed on a straight, level paved course (preferably 500 m).
- Test conditions
- Preferred thermal environment ~25 °C (acceptable 20–30 °C for drum; 5–30 °C for vehicle).
- Test speed reference 80 km/h (vehicle method allows ±2 km/h).
- Road/course limits: max longitudinal and transverse gradient 1 %; wind ≤ 7 m/s.
- Measurement accuracy and instrumentation
- Minimum impulse resolution: drum method ≥10 impulses/rev; vehicle method ≥16 impulses/rev.
- Total impulses per measurement >1 000 (drum); counting error ≤0.1 % (vehicle).
- Alignment tolerances: slip angle within 3 mrad; camber within 10 mrad.
- Tyre loading and inflation
- Load = 80 % of tyre load capacity (based on load index) applied to drive axle (±2 % for vehicle).
- Inflation pressure = reference pressure minus 30 kPa (reference from ISO 4000-1 or manufacturer).
- Procedures and repeatability
- Break-in conditioning (drum: ≥1 h at 80 km/h; vehicle: ≥0.5 h) and specified warm-up/cooling periods.
- Vehicle tests require multiple runs in both directions and repeat if runs differ beyond 0.2 %.
- Annex A tolerances
- Example equipment tolerances: tyre load ±50 N, pressure ±5 kPa, surface velocity ±0.5 km/h, drum measurement ±1 mm, angular velocity ±0.2 %.
Applications and users
ISO 17269:2000 is used by:
- Tyre manufacturers and R&D labs for consistent measurement of rolling circumference.
- Independent test laboratories seeking repeatable, comparable results across facilities.
- Vehicle manufacturers and technical teams correlating tyre characteristics with vehicle systems.
- Regulatory and standards bodies referencing standardized measurement procedures.
The standard supports laboratory ↔ road correlation (it includes empirical correction formulas) and provides repeatable methods for engineering, validation, and comparative testing.
Related standards
- ISO 4000-1 (referenced for tyre categories and reference inflation pressures)
- Bibliographic references in ISO 17269 include ISO 10191 and ISO 4223-1 for related tyre testing and terminology.
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