Tire Safety Standards Modernization

Summary#

This bill tells the Department of Transportation to update several federal tire safety rules. It would remove some older strength tests, change the definition of “chunking” (pieces breaking off a tire), clarify that visible chunking is a test failure, set new high‑speed tire tests, and ask the Government Accountability Office (GAO) to study results later. The broad goal is to modernize tire testing and bring U.S. rules closer to recent international standards.

Key changes:

• Removes certain sample, testing, and performance rules about tire strength and bead unseating for passenger car and light truck radial tires in FMVSS No. 139 (Federal Motor Vehicle Safety Standard No. 139).
• Changes the definition of “chunking” in FMVSS No. 139 to add a special definition for snow tires and orders a review of the definition for non‑snow tires (including all‑season tires).
• Clarifies that visible evidence of chunking means a tire fails endurance and low‑pressure tests under FMVSS No. 139.
• Removes testing and performance requirements for tire strength for radial light truck and radial commercial tires in FMVSS No. 119.
• Requires new, uniform high‑speed performance test rules within 180 days that match parts of the U.N. Global Technical Regulation on Tyres (GTR No. 16).
• Directs GAO to report 3–5 years after final rules (or 8 years after enactment) on implementation, market effects, definitions, and recommendations.

What it means for you#

• Tire manufacturers

  • May need to change their testing and certification processes to meet the revised FMVSS No. 139 and No. 119 rules.
  • Will have to follow new high‑speed test protocols that include speed symbols and stepwise sustained speeds under set loads, pressures, and temperatures.
  • May be affected by a review that could further change the chunking definition for non‑snow tires.

• Vehicle manufacturers

  • May need to adjust which tires they approve for new vehicles if tire tests or labels change.

• Drivers / Car owners

  • Tire labels or speed ratings could change over time if the new tests lead to different speed symbols or ratings.
  • The bill says visible chunking counts as a failure in tests. This could affect which tires are approved and sold, but the bill does not directly change consumer maintenance rules.

• Testing labs and certification bodies

  • May face new work to implement the high‑speed protocols and any revised endurance or low‑pressure tests.

• Regulators (NHTSA / DOT)

  • Must revise rules within set timeframes (see Timing below) and oversee implementation.

• Timing

  • Within 180 days: DOT must publish new high‑speed testing regulations.
  • Within 1 year: DOT must revise FMVSS No. 139 and No. 119 as described.
  • GAO report: 3–5 years after final rules are published, or 8 years after enactment, whichever is sooner.

Expenses#

No publicly available information.

Possible expenses and trade-offs the bill may create:

• The Department of Transportation (NHTSA) will need staff time and rulemaking resources to revise standards and issue new regulations.
• Testing labs and tire makers may face costs to run new or different tests and to update equipment or procedures.
• Manufacturers might pass some compliance costs to consumers through tire prices.
• There could be costs for vehicle makers if they must change tire approvals or vehicle testing linked to tires.
• The GAO study will use federal resources to prepare the report (cost unspecified).

Proponents' View#

• The bill appears intended to modernize U.S. tire safety rules to reflect current tire designs and testing practices.
• It would align some U.S. tests with international standards in the U.N. GTR No. 16, which could improve consistency for global manufacturers.
• Clarifying that visible chunking is a failure could make endurance testing outcomes clearer.
• Removing outdated or irrelevant test rules may allow newer test methods that better assess modern tires.
• The GAO study would provide data on market and safety effects and guide future changes.

Opponents' View#

• One concern is that removing certain existing strength and bead unseating tests could leave gaps in safety coverage unless the new tests fully replace them.
• The bill does not clearly list how removed tests will be replaced for all tire types, especially for light truck and commercial radial tires.
• Short deadlines for some rule changes (180 days and 1 year) may be challenging for regulators and industry to meet without rushed work.
• It is unclear what costs manufacturers and testing labs will face; the bill provides no fiscal estimate.
• The review of the “chunking” definition may take time, leaving some uncertainty about how all‑season and other non‑snow tires will be judged during the transition.