UNIFORM TIRE QUALITY GRADING - TREADWEAR

The treadwear testing in the main followed the UTOG-treadwear procedure as published in the Federal Register on Jan. 4, 1974 (Docket #25-notic #7). In this test procedure the route is selected such that the NHTSA Control Tire is worn to a specified level in 16000 miles. In this contract a 65+5% Control Tire treadwear goal was selected after preliminary trails indicated that a higher wear level could only be obtained by using excessive speed on the curves. Using this common treadwear goal for all the test routes, the various single car, single 4-car convoy and dual 4-car convoy tests required significant, but practical, "in the field" route adjustments. The data show the amount of treadwear decreases as the number of vehicles in convoy increases. The contract compared the treadwear obtained from similar vehicle models of two different car manufacturers. Using the 7.75-14NHTSA Control Tires as the measuring device the 1974 Ford Torino was 5% better for treadwear than the 1974 Plymouth Satellite. In Phase #1, the 7.75-14 NHTSA Control Tires (Armstrong Tire-Sept. 1974) were used to rate six (6) groups of special and commercial tires. In Phase #2, the 8.55-15 NHTSA Control Tires (Armstrong Tire-Aug. 1974) were used to rate three (3) groups of San Angelo Course Monitoring Tires.

Media Info

  • Pagination: 10 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00098913
  • Record Type: Publication
  • Source Agency: Highway Safety Research Institute
  • Report/Paper Numbers: DOT/HS 801611 Final Rpt.
  • Contract Numbers: DOT-HS-4-00896
  • Files: TRIS, USDOT
  • Created Date: Oct 18 1975 12:00AM