Federal Motor Vehicle Safety Standards; New Pneumatic and Certain Specialty Tires

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This NPRM proposes to amend Federal Motor Vehicle Safety Standard (FMVSS) No. 109, New pneumatic and certain specialty tires, to change the test pressure for the physical dimensions test for T-type tires (temporary use spare tires) from 52 pounds per square inch (psi) to 60 psi. A 60-psi test pressure for the physical dimensions test would marginally increase the stringency of the test while harmonizing FMVSS No. 109 with international and voluntary consensus standards. This NPRM responds to a petition for rulemaking from the Tire & Rim Association.