SAE J966 pdf download
SAE J966 pdf download.(R) Test Procedure for Measuring Passenger Car Tire Revolutions Per Mile.
2. References
2.1 Applicable Publications—The following publications form a part of the specification to the extent specified herein. Unless otherwise indicated, the latest revis,on of SAE publications shall apply.
2.1.1 SAE PueucATeor+—Availabie from SAE, 400 Commonwealth Drive, Warreridale. PA 15096-0001.
SAE J678—Speedometers and Tachometers—Automotive
2.1,2 TIRE AND RIM AssociATioN PUBUCATION—Available from Tire and Rim Association, 175 Montrose West Avenue, Suite 150, Copley, OH 44321.
Tire and Rim Association Year Book
3. Road Conditions—The test shall be a two mile, reasonably level straight-away section of dry pavement of consistent constwclion and surface, that is. concrete or blacktop. It should not have intermittent sections of each.
4. Temperature—Ambient test temperature shall be between 40 and 80 °F.
5. Vehicle Preparation and Test Load
5.1 Tire Position—Since most speedometers are actuated from the dnveshaft. the tires to be tested should be installed on the drive wheel positions. The tires shall be a matched set of the same brand, having the same degree of wear.
5.2 Test Load—The load on each tire shall be the 88% maximum load rating for the particular size as given in the current Tire and Rim Association Year Book.
5.3 Breakln—Prior to the test, the tires shall be conditioned by running a breakin schedule of 161 km ± 32 km (100 mdes ± 20 miles) at approximately 97 km/li (60 mph),
5.4 Test Speeds—Tire revolutions shall be counted at 72, 40, and 105 km/h (45, 25, and 65 mph) using a ftth wheel or calibrated vehicle speedometer for measurement of the test speed.
6. Method of Test—Tires shall be warmed up by a 16km (10 mile) run on the straight-away at 72km/h (45 mph). After warmup. adjust the pressure of each tire to 200 kPa (29 psi) and immediately run the 3 km (2 mile) test at 72 km/h (45 mph), followed by the 40 km/h (25 mph) and 105 km/h (65 mph) test. In the event of a stoppage or interruption of the test of sufficient duration to permit the tires to cool, the tire warmup and pressure adjustment to 200 kPa (29 psi) shall be repeated before resuming further tire revolution determinations.
Count the tire revolutions required to traverse a distance of 3 km (2 miles> in each direction at a constant speed. A measured course or calibrated fifth wheel may be used for distance determination. Tire revolutions per mile count at 72 knVh (45 mph) is derived by averaging the results of tour runs (8 miles) which are within 1% of each other. Repeat for 40 km/h (25 mph) and 105 km/h (65mph).
The revolutions per mile of the tested tires shall be determined for each speed, the 72 kmh (45 mph) revolutions being the standard value. Revolutions per mile for 40 and 105 km/h (25 and 65 mph) are recorded to show differences due to speed.
7. Notes
7.1 Marginal Indicia—The change bar (I) located in the left margin is for the convenience of the user in locating areas where technical revisions have been made to the previous issue of the report. An (R) symbol to the left 01 the document title indicates a complete revision of the report.
