ASTM F1016-07

Standard Practice for Linear Tire Treadwear Data Analysis

SIGNIFICANCE AND USE
The purpose of this practice is to standardize the meaning and derivation of some terms and indexes that are commonly used to characterize treadwear.
5.1.1 There is no intent to recommend either of the two treadwear performance indexes: distance per unit loss of tread depth or loss of tread depth per distance unit.
SCOPE
1.1 This practice describes the elementary linear regression analysis of basic treadwear data as obtained according to Test Method F 421 and Test Method F 762.
1.2 The basic treadwear data are obtained as groove depth loss measurements by procedures described in Test Method F 421 after a series of test cycles (test distances under specified conditions) according to Test Method F 762.
1.3 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.
1.4 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.
1.5 This practice is not applicable to the prediction of treadlife for tires that exhibit non-linear or irregular treadwear.
1.6 Evaluation parameters are given for both SI and inch-pound units; either may be used. The evaluation parameters as defined are ones typically used in the tire testing industry and no special claim is made for superiority of these parameters and terms over other terms and parameters that may be developed.

General Information

• Status: Historical
• Publication Date: 30-Jun-2007
• ICS: 83.160.10 - Road vehicle tyres
• Technical Committee: F09 - Tires
• Drafting Committee: F09.30 - Laboratory (Non-Vehicular) Testing

Relations

• Replaces: ASTM F1016-93(2001) - Standard Practice for Linear Tire Treadwear Data Analysis
• Effective Date: 01-Jul-2007
• Replaced By: ASTM F1016-07(2013)e1 - Standard Practice for Linear Tire Treadwear Data Analysis
• Effective Date: 01-Jun-2013
• Referred By: ASTM F762/F762M-08(2020)e1 - Standard Test Method for Determining Change in Groove (or Void) Depth With Distance Traveled for Passenger Car Tires
• Effective Date: 01-Jul-2007

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F1016 − 07
StandardPractice for
1
Linear Tire Treadwear Data Analysis
This standard is issued under the fixed designation F1016; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope F538 Terminology Relating to the Characteristics and Per-
formance of Tires
1.1 This practice describes the elementary linear regression
F762 Test Method for Determining Change in Groove (or
analysis of basic treadwear data as obtained according to Test
Void) Depth With Distance Traveled for Passenger Car
Method F421 and Test Method F762.
Tires
1.2 The basic treadwear data are obtained as groove depth
loss measurements by procedures described in Test Method
3. Terminology
F421 after a series of test cycles (test distances under specified
3.1 Definitions:
conditions) according to Test Method F762.
3.1.1 average tire tread depth, [L],n—the average of all tire
1.3 A linear regression analysis is performed for the rela-
groove (void) depth measurements. F538
tionship between average tire tread depth and the test distance
3.1.2 break-in, [L],n—one or more periods of initial stan-
traveledbythetestvehicle,onwhichthetesttiresaremounted.
dardized tire operation during which tire is brought to the state
From this analysis a rate of wear is determined: groove depth
which will lead to more consistent test results. F538
loss per unit distance.
3.1.3 fastest wearing groove, [L],n—the circumferential
1.4 Linear treadwear is defined as an essentially constant
groove with the minimum life expectancy. F538
rate of wear, after break-in, which results in a linear regression
2
3.1.4 fastest wearing location, [L],n—that location which
coefficient of determination, R , equal to or greater than 0.95
exhibits the highest percent tread (depth) loss as calculated in
whenobtainedforadatasetwherethenumberofmeasurement
6.1.1. F538
intervals, n, is at least 3. Each measurement interval represents
a specific test distance.
3.1.5 groove, average depth, [L],n—the average of all tire
groove depth measurements in a single groove. F538
1.5 This practice is not applicable to the prediction of
treadlife for tires that exhibit non-linear or irregular treadwear.
3.1.6 projected treadlife, [L],n—the test distance that gives
h as the average tread depth; where h is the height of treadwear
1.6 Evaluation parameters are given for both SI and inch-
indicator above groove (or void) base. F538
pound units; either may be used. The evaluation parameters as
defined are ones typically used in the tire testing industry and 3.1.7 test distance, [L],n—distance traveled by a vehicle
no special claim is made for superiority of these parameters
after tire break-in. F538
and terms over other terms and parameters that may be
developed.
4. Summary of Practice
4.1 This practice provides a calculation procedure for linear
2. Referenced Documents
regression analysis of treadwear data to be used in the tire
2
2.1 ASTM Standards:
industry for assessing tire treadwear performance.
F421 Test Method for Measuring Groove and Void Depth in
4.2 No specific mathematical formulas are given for the
Passenger Car Tires
customary least-squares calculations used for linear regression
parameter evaluation since these calculation algorithms are
readily available with electronic hand calculators or statistical
1
This practice is under the jurisdiction ofASTM Committee F09 on Tires and is
software for personal computers, or both.Terms are defined for
the direct responsibility of Subcommittee F09.30 on Laboratory (Non-Vehicular)
Testing.
slope, intercept, and coefficient of determination.
Current edition approved July 1, 2007. Published July 2007. Originally approved
in 1986. Last previous edition approved in 2001 as F1016 – 93 (2001). DOI:
5. Significance and Use
10.1520/F1016-07.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1 The purpose of this practice is to standardize the
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
meaning and derivation of some terms and indexes that are
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. commonly used to characterize treadwear.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F1016 − 07
5.1.1 There is no intent to recommend either of the two 1
IRW~1000 mi/mil! 5 (6)
treadwear performance indexes: distance per unit loss of tread RW~ mils/1000 mi!
depth or loss of tread depth per distance unit.
where RW = absolute loss in
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