tyres: rolling resistance, noise, and wet grip.

UNECE Regulation No. 117 is an international standard that establishes the type-approval requirements for tyres concerning three fundamental parameters: rolling resistance, rolling noise, and wet grip. This regulation was introduced to improve road safety, reduce noise pollution, and promote energy efficiency.

Details of the Regulation

The Regulation applies to new tyres for vehicles in categories M1, N1, O1, and O2 (passenger cars, light commercial vehicles, and trailers). Tyres must be tested according to specific procedures to demonstrate compliance with the established limits for each of the three parameters.

  • Rolling Resistance (RRC – Rolling Resistance Coefficient): This measures the force needed to keep the tyre moving at a constant speed. A lower RRC value indicates greater energy efficiency and, consequently, lower fuel consumption.

  • External Rolling Noise: This evaluates the noise emitted by the tyre while rolling on a standard road surface. The objective is to reduce noise pollution caused by traffic.

  • Wet Grip: This measures the tyre’s ability to grip the road in wet conditions, a crucial factor for safety.

These three parameters are also the ones indicated on the European tyre label, which has been mandatory since 2012 for all tyres sold in the European Union. UNECE Regulation No. 117 is one of the main technical references that supports the requirements of the European label.

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The Role of ATS Group in the Type-Approval Process

For manufacturers who need to get tyres approved under UNECE Regulation No. 117, ATS Group can act as a Technical Service to conduct tests and prepare the necessary documentation. This role is crucial for obtaining type approval, which is the certification that a product meets regulatory requirements.

ATS Group supports manufacturers through all phases of the type-approval process, acting as an intermediary between the manufacturer and the competent type-approval authorities. Specifically, the services offered include:

  • Test Execution: As an accredited laboratory, ATS Group performs the tests required by UNECE Regulation No. 117. These tests measure rolling resistance, external rolling noise, and wet grip. The results of these tests are fundamental to proving the tyre’s compliance.

  • Preparation of Technical Documentation: After completing the tests, ATS Group collects and organizes all the required technical documentation, such as test reports and certificates. This documentation is then submitted to the Type Approval Authority, which is the body that issues the official type approval.

  • Support for the Type-Approval Process: The ATS Group team assists the manufacturer throughout the entire bureaucratic process, from submitting the application to the issuance of the type-approval certificate. This support is essential for navigating regulatory complexities and speeding up approval times.

Conformity of Production (CoP)

CoP is a crucial phase in the type-approval process for a vehicle, its component, or a separate technical unit. It serves to demonstrate that the manufacturer has implemented the necessary procedures and controls to ensure that all products coming off the assembly line consistently maintain the quality and safety standards established during the type-approval phase. In other words, it’s not enough for a prototype to pass the tests; it’s necessary to demonstrate that the entire production process can replicate that result consistently.

To obtain CoP, a manufacturer must undergo a series of technical audits and inspections conducted by certifying bodies. These audits evaluate the entire production process, checking aspects such as:

  • Full traceability of components.

  • Process controls at every stage of production.

  • A quality management system that complies with standards, such as ISO 9001, even if this is not mandatory.

  • Repeatable tests and checks on every product.

  • Management of non-conformities and corrective actions.

CoP is a regulatory requirement mandated by type-approval authorities to sell products on the market. Maintaining conformity of production is an ongoing process, with periodic inspections by certification bodies to ensure that the quality system remains effective over time.

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