AN INVESTIGATION OF A LOW-VARIABILITY TIRE TREADWEAR TEST PROCEDURE AND OF TREADWEAR ADJUSTMENT FOR AMBIENT TEMPERATURE. VOLUME I, THE TEST PROCEDURES, STATISTICAL ANALYSES, AND THE FINDINGS

The program was conducted to evaluate the variation in tire treadwear rates as experienced on identical vehicles during the various environmental exposure conditions of the winter, spring, and summer seasons. The diurnal/nocturnal effect on the treadwear rate was evaluated by running separate but similar test samples on the same four-car convoys. A two-car convoy was utilized during the spring to extend the total mileage on two of the winter test sets to 24,000 miles. A summer test of 16 sets in exactly the same test configuration as the previous winter test was conducted using the same vehicles and, where possible, the same drivers. Tread loss was measured by determining the periodic loss in tread-groove depth and in total tire weight. Both methods were very carefully controlled. Special investigations of (1) the effect of different drivers on treadwear results (measurement of absolute vehicle acceleration during normal test operations) and (2) a means of determining projected mileage by using tire weight loss rates. The report contains a statistical analysis of the wear rates both in mils and grams per 1000 miles as they relate to the vehicle, season, environmental condition, driver, and how eight test sets each of four different manufacturer groups (total of 32 test sets) are variable within themselves. Volume II, 542 pages, contains data pertaining to the test effort. Volume III, 502 pages, contains data used in the statistical analysis effort.

• 
• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/8601
• Corporate Authors:

  Southwest Research Institute

  6220 Culebra Road, P.O. Drawer 28510
  San Antonio, TX  United States  78228-0510

  National Highway Traffic Safety Administration

  Office of Research and Development, 1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Pierce, R N
  • Mason, R L
  • Hudson, K E
  • Staph, H E
• Publication Date: 1985-1

Media Info

• Features: Figures; Tables;
• Pagination: 106 p.

Subject/Index Terms

• TRT Terms: Daily; Drivers; Environment; Industries; Seasons; Statistical analysis; Temperature; Testing; Tire treads; Tires; Wear; Weight
• Uncontrolled Terms: Seasonal variations
• Subject Areas: Data and Information Technology; Highways; Vehicles and Equipment; I95: Vehicle Inspection;

Filing Info

• Accession Number: 00399266
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: EFL-7928-1 Final Rpt., HS-806 710
• Contract Numbers: DTNH22-84-C-07106
• Files: HSL, NTL, TRIS, USDOT
• Created Date: Sep 30 1985 12:00AM