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Compression Rim Grooving-- An Objective Measurement Technique

By Troy Cottles. Compression Rim Grooving-- An Objective Measurement Technique. Presented at the HIFI Tire Tech Conference, Houston, TX August 13, 2010. Compression Rim Grooving-. Background: Prior studies Methodology Subjectivity Precision. Compression Rim Grooving-. Background:

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Compression Rim Grooving-- An Objective Measurement Technique

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  1. By Troy Cottles Compression Rim Grooving--An Objective Measurement Technique Presented at the HIFI Tire Tech Conference, Houston, TX August 13, 2010

  2. Compression Rim Grooving- • Background: • Prior studies • Methodology • Subjectivity • Precision

  3. Compression Rim Grooving- • Background: • Objective Measurement Technique:

  4. Compression Rim Grooving- • Background: • Test Protocol: CONTROL REDUCED-INFLATION Inflation Pressure: 30 PSI 21 PSI Load: 890 lbs 890 lbs Rim: 14 X 5.5 14 X 5.5 Speed: 75 mph 75 mph Duration: 40,000 miles 40, 000 miles

  5. Compression Rim Grooving- • Background: • Test Tires: • Yokohama Aspec A300, H-rated, FD3505 • Bridgestone B700AQ, T-rated, 2R3605 • Dunlop Sp Sport LM701, H-rated, EU4005 • Dayton Quadra SE, S-rated, HY2105 • Firestone FR690, S-rated, W22805 • Uniroyal Tiger Paw, S-rated, K41605 • Hankook Radial H714, S-rated, 1G1405 • Michelin Symmetry, S-rated, HN1204 • Toyo Spectrum, S-rated, 9T5004 • Federal Supersteel 735, T-rated, 2E4905 • Cooper Lifeliner SLE, T-rated, U94305 • Dunlop SP20FE, S-rated, M63605

  6. Compression Rim Grooving- • Control Tires: • New Tire Photos-Tire #28 Uniroyal Tiger Paw

  7. Compression Rim Grooving- • Control Tires: • New Tire Laser Profile-Tire #28 Uniroyal Tiger Paw

  8. Compression Rim Grooving- • Control Tires: • Tire Photos After Test-Tire #28 Uniroyal Tiger Paw

  9. Compression Rim Grooving- • Control Tires: • Laser Overlays-Tire #28 Uniroyal Tiger Paw

  10. Compression Rim Grooving- • Conclusions: • Tire designers calculate bead compression values when tires are being designed and developed. Without bead compression the tire would not fit properly to the rim, possibly lose air, slip on the rim or de-bead. • Previous studies have concluded that rim grooves are produced by under-inflated operation. •  This study demonstrates that rim grooves can be produced even under proper inflation and load conditions. • Twelve control tires of different brands, manufacturing facilities, tire constructions, rubber compounds and properties, amounts of rubber gauge in the bead flange area, and various bead contour designs were operated on laboratory drum machines under the same loads, inflation pressures, and speeds where the variable of how often someone might check their tire pressure on their personal vehicle was eliminated from consideration. Given many of the mentioned differences in the control tires, the rim grooves generated varied from just perceptible to clearly-defined as to rim groove depth. • The notion that the mere presence of a rim groove could serve as the sole indicator of tire under-inflated operation for a consumer is itself not useful or practical, since the tire would have to be removed from the rim in order to view the area in question. • The notion that the mere presence of a rim groove could serve as the sole indicator of tire under-inflated operation for a proper forensic analysis is likewise unreliable as an indicia of that condition given the range of rim grooves presented in the control tires in this test. • It is possible to evaluate rim grooves (and other contour changes to tires) through the objective, high-precision, non-contacting, quantifiable means of laser scan imaging as demonstrated in this study.

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