Law & Order

NHTSA to Update Baseline Tire Standard Used for Rating Tire Performance


By SEMA Washington, D.C., Staff

The National Highway Traffic Safety Administration (NHTSA) has issued a proposed rule to update the standard reference test tire (SRTT) used as a baseline tire to rate treadwear, braking traction, snow traction and evaluate pavement surface friction.

ASTM E1136, Standard Specification for P195/75R14 (14-in. SRTT) will be replaced with ASTM F2493, Standard Specification for P225/60R16 (16-in. SRTT). The change is necessary because the only manufacturer of the currently referenced SRTT ceased production of the tire—a 14-in. all-season steel-belted radial tire. The new SRTT will be cross-referenced in all applicable NHTSA standards and regulations. Comments due: September 7, 2021.

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