Bridgestone Medium and Light Truck Tire Data Book - Sullivan Tire ...

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Effective January 2010 Technical Bulletins October 1995 TECHNICAL BULLETIN Extra-Deep-Tread Tires' Lateral Stiffness Effects Ref. No. T9502TI Many drivers are aware of the feel of the trucks used on a daily basis in fleets, and are sometimes sensitive to the ride dynamics of fitment changes of new tire designs on the vehicle. One of the sensations drivers notice is a side-to-side motion. This motion is the byproduct of what is commonly referred to as lateral stiffness. The lateral stiffness of a tire is due in large part to inflation pressure, as well as the tire’s tread depth. Both of these factors vary over time. Reduced inflation pressure and deeper tread depth results in lower lateral stiffness. Therefore, some users may comment on experiencing a slight swaying with newly installed extra-deep-tread drive tires, especially under full load or after replacing worn drive tires. The sensation the driver feels is the lateral stiffness effect of the extra-deep-tread drive tire compared to the worn tire being replaced and does not affect traction or warrant any concerns. The lateral stiffness improves quickly as the tread wears and a driver will become accustomed to the initial difference in sensation. BRIDGESTONE FIRESTONE NORTH AMERICAN TIRE COMPANY, LLC Bridgestone Technical Hotline 1-800-847-3272 Medium Truck Light Truck General Technical Load/Inflation Technical Bulletins 107
Technical Bulletins 2010 Bridgestone Medium and Light Truck Tire Data Book Technical Bulletins Load/Inflation General Technical Light Truck Medium Truck October 1995 TECHNICAL BULLETIN Bridgestone Firestone Chassis Dynamometer Test Guidelines for Truck/Bus Tires I. Background Vehicle manufacturers and many maintenance facilities conduct in-place vehicle testing on twin-roll chassis dynamometers. Testing is usually conducted over a short period of time on empty vehicles. If the following procedure is not adhered to, irreversible damage may occur to the tire. II. Procedure To prevent excessive head buildup in the center of the tire tread, follow the recommended time period based on roller diameter as listed below: Maximum Allowable Time by Roller Diameter 8-5/8" Roller 18" Roller 3.5 minutes 6 minutes Maximum Allowable Speed is 55 mph. Load: These time restrictions apply regardless of the actual load and are, in fact, more critical when the vehicle is tested without a load. Ref. No. T9501X Example of Dyno Damage III. Precautions To avoid the possibility of irreversible tire damage and/or failure during testing, it is important that the following precautions be taken: • Do not exceed the time and speed restrictions listed in part II. • Allow at least one hour cool down between tests. • When it is anticipated that a test will exceed the time/test value established, a worn or “slave” tire should be used in place of the new tire for testing purposes. Questions regarding test procedures, loads, etc. should be directed to your Regional Field Engineering Office. BRIDGESTONE FIRESTONE NORTH AMERICAN TIRE COMPANY, LLC Bridgestone Technical Hotline 1-800-847-3272 108
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