Low Rolling Resistance Tires – Winter Performance

Overview

  1. The Fine Print
  2. Methodology
  3. Part 1 - Laboratory Based Testing
  4. Part 2 - Vehicle Based Testing
  5. Vehicle Testing Results Summary

1. The Fine Print

  • Gross differences in tire performance differences (if any)
    • NOT a tire ranking exercise
  • Tire selection independent of manufacturer support
    • Acquired through channels available to consumers

2. Methodology

  • Lab Based Testing
  • Vehicle Based Testing

3. Part 1 - Laboratory Based Testing

Purpose of Lab Tests

  • Quantify performance differences
  • Help correlate vehicle test results

Limitations

  • Single tire sample per test
  • Snow traction test is an outdoor test
    • Weather dependent
    • Relative
  • Trends & gross differences only
    • No ranking

Test to be Performed

  • Rolling Resistance Measurement
    • Smithers facility in Ravenna, OH
  • Durability Testing
    • Smithers facility in Ravenna, OH
  • Snow Traction
    • Smithers facility in Raco, MI

Rolling Resistance Results

Figure 1
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Figure 2
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Durability Testing

  • Durability testing allows for qualitative comparison. It does NOT model or predict tire lifespan
  • The base test only establishes a minimum level of performance for road worthiness

Durability Testing Results

Figure 3
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Figure 4
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Durability Testing Notes

  • At its core, the durability test is only an acceptability test.
  • Durability test does NOT model or predict lifespan.

Snow Traction Testing

  • Based on ASTM F1805, modified for heavy truck tires
  • Results are normalized against a “control” tire
  • Forward (driving) traction only.
    • No lateral component (such as cornering)
    • No braking

Snow Traction Apparatus

An image showing a truck loaded with boxes containing the various data collection apparatuses for the Snow Traction Test

Snow Traction Results

Figure 5
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Figure 6
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Lab Results Summary

  • Rolling Resistance
    • SmartWay-verified tires have much lower RR
  • Durability
    • Comparable to non-SmartWay-verified tires
  • Snow Traction
    • Comparable to non-SmartWay-verified tires

4. Part 2 - Vehicle Based Testing

Purpose of Vehicle Based Testing

  • Does a SmartWay-verified designation entail a significantly reduced winter performance?
  • Lab vs. Actual (vehicle based testing)
  • Possible effects on vehicle interaction

Vehicle Setup

  • Extensive instrumentation
    • Vehicle computer
    • GPS
    • IMU
  • Other additional data

Tests to be Performed

  • Stopping Distance Measurement
  • Turning Test
    • On/off ramp analogue

Limitations

  • Single configuration sample per test
  • Weather dependent
  • Trends and gross differences only
    • No ranking

Stopping Distance Results

Figure 7
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Turning Test

  • Simulation of on/off ramp
  • Road holding ability
  • 180 degree turn, 23 m radius

Turning Test Results

  • Pass/Fail only
Turning Test Entry Speed
Tire
Configuration
20 km/h 25 km/h 30 km/h 35 km/h
A/A PASS PASS PASS FAIL
B/B PASS PASS FAIL not attempted
C/C PASS PASS PASS FAIL
C/D PASS PASS PASS FAIL
E/E PASS PASS PASS FAIL
F/F PASS PASS PASS FAIL

Vehicle Testing Results Summary

  • Stopping Distance
    • Comparable to non-SmartWay-verified tires
    • No adverse system interaction
  • Turning/Road Holding
    • Comparable to non-SmartWay-verified tires
    • No adverse system interaction

Alternative format

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