ASTM F 1016 - 07 (Reapproved 2013)ε1 Standard Practice for Linear Tire Treadwear Data Analysis

Current edition approved June 1, 2013. Published September 2013. Originally approved in 1986. Last previous edition approved in 2007 as F1016 – 07. — 3 p.
This practice describes the elementary linear regression analysis of basic treadwear data as obtained according to Test Method F421 and Test Method F762.
The basic treadwear data are obtained as groove depth loss measurements by procedures described in Test Method F421 after a series of test cycles (test distances under specifiedconditions) according to Test Method F762.
A linear regression analysis is performed for the relationship between average tire tread depth and the test distance traveled by the test vehicle, on which the test tires are mounted. From this analysis a rate of wear is determined: groove depth
loss per unit distance.
Linear treadwear is defined as an essentially constant rate of wear, after break-in, which results in a linear regression
coefficient of determination, R2, equal to or greater than 0.95 when obtained for a data set where the number of measurement intervals, n, is at least 3. Each measurement interval represents a specific test distance.
This practice is not applicable to the prediction of treadlife for tires that exhibit non-linear or irregular treadwear.