Overview
ISO 7141:2022 - "Road vehicles - Light alloy wheels - Lateral impact test" defines a laboratory procedure to evaluate the axial (lateral) kerb-impact performance of wheels made wholly or partly of light alloys. Intended primarily for passenger cars and special vehicles where kerb contact is a possibility, the standard is used for screening and quality control of wheels to ensure safety and durability after lateral impacts.
Keywords: ISO 7141:2022, light alloy wheels, lateral impact test, kerb impact, wheel testing, quality control
Key topics and requirements
- Scope and purpose: Laboratory test to assess wheel behaviour during an axial (lateral) kerb impact; aimed at passenger car applications and vehicle types exposed to kerb strikes.
- Test specimen: New, fully processed wheels fitted with the tyre intended for vehicle use. Tyres and wheels used in the test shall not be re-used on vehicles.
- Impact apparatus: Vertically acting steel striker (face plate) and an impact loading machine. Striker geometry and overlap are specified so the striker contacts the rim flange.
- Striker mass and loading: Striker mass is determined from the wheel/vehicle maximum vertical static load (manufacturer-specified or, if absent, the tyre’s largest load rating). A 1 000 kg calibration mass is used for rig calibration.
- Drop height and velocity calibration: Standard drop height is 230 ± 2 mm, with an allowable adjusted drop height (ADH) to compensate for machine friction. Velocity is verified using a gate/timing blade method; the gate time target is 12.31 ms ± tolerance (see Annex A guidance).
- Mounting and environmental conditions: Wheel axis mounted at (13 ± 1)° to vertical, tyre inflation per manufacturer or 200 kPa if unspecified, and ambient temperature maintained between 10 °C and 30 °C.
- Test procedure: Single-impact test with specific striker overlap (about 25 ± 1 mm onto rim flange). Re-test allowed only if secondary impacts (rebound or mass resting) invalidate the initial result.
- Failure criteria: The wheel fails if any of the following occur:
- Visible fracture(s) penetrating the wheel centre member,
- Centre member separates from the rim,
- Tyre loses all air pressure within 1 minute.
Deformation or fractures localized to the rim area struck by the striker (outer rim horn) are not automatically considered failures.
Applications and users
ISO 7141:2022 is used by:
- Wheel and tyre manufacturers for product development and production quality control.
- Automotive OEMs and suppliers to validate wheel designs against kerb-impact hazards.
- Test laboratories performing conformity testing and engineering validation.
- Regulatory and safety engineers assessing wheel performance for vehicle certification or aftermarket wheel assessment.
Practical benefits include consistent, repeatable kerb-impact assessment, early detection of design weaknesses, and a harmonized test basis for supplier–OEM acceptance.
Related standards
- ISO 3911 - Wheels and rims for pneumatic tyres - Vocabulary, designation and marking (referenced for terms and definitions).
- See ISO/TC 22 publications for related vehicle dynamics and wheel testing standards.
