DEVELOPMENT OF TIRE INTERMIX PERFORMANCE AND INSPECTION SYSTEM. VOLUME I: EXECUTIVE SUMMARY

A tire intermix classification system, based on measured side force properties of individual designs, was developed and validated to improve on current industry recommendations utilizing categories of construction type (cord orientation) and section size ratios. The system predicts intermix-caused changes in a vehicle's understeer gradient at a mid-performance cornering operating point. Based on prohibiting differentials exceeding 3 deg/g, this system proved more effective in limiting unacceptable intermix than the current recommendations. Seventy-eight passenger car tire designs were laboratory tested and analyzed during this program; 42 radials, 21 bias belted, and 15 bias ply. Wide differences in cornering compliance were found among tires of the same construction type and size. Validation field tests were conducted on three vehicles to compare predicted changes in understeer (due to cornering compliance) with that actually measured. The results support the recommendations for a system based on a maximum allowable differential in classification numbers which could be stamped on individual tires.

• Supplemental Notes:
  • See also Volume 2, PB82-126913. Also available in set of 3 reports PC E14, PB82-126897.
• Corporate Authors:

  Systems Technology, Incorporated

  13766 South Hawthorne Boulevard
  Hawthorne, CA  United States  90250

  National Highway Traffic Safety Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • HOGUE, J R
  • Szostak, H T
  • Klein, R H
• Publication Date: 1981-4

Media Info

• Features: Figures; References; Tables;
• Pagination: 41 p.

Subject/Index Terms

• TRT Terms: Field tests; Inspection; Laboratory tests; Performance; Performance tests; Radial ply tires; Safety; Steering; Tests; Tires; Validation
• Old TRIS Terms: Cornering (Vehicle); Radial tires
• Subject Areas: Highways; Safety and Human Factors; Vehicles and Equipment; I91: Vehicle Design and Safety; I95: Vehicle Inspection;

Filing Info

• Accession Number: 00346698
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: STI-TR-1144-1-I Final Rpt., HS-805 983
• Contract Numbers: DOT-HS-9-02131
• Files: HSL, NTIS, TRIS, USDOT
• Created Date: Jan 29 1982 12:00AM