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Commercial Vehicle Tires and Testing

Commercial Vehicle Tires and Testing . Jennifer Russert. 2002 Chevrolet Suburban. Tag. Drive. Steer. 1996 Dina Viaggio Motorcoach. Minimum Tire Tread Depths (inches). Motorcoach Tires – Tread Depth. Motorcoach Tires – Tread Depth. Low Tread Depth

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Commercial Vehicle Tires and Testing

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  1. Commercial Vehicle Tires and Testing Jennifer Russert

  2. 2002 Chevrolet Suburban

  3. Tag Drive Steer 1996 Dina Viaggio Motorcoach

  4. Minimum Tire Tread Depths (inches)

  5. Motorcoach Tires – Tread Depth

  6. Motorcoach Tires – Tread Depth • Low Tread Depth • Decreases ability for tires to channel water • Limits the ability of tire to maintain contact with the roadway • Effect on friction and handling • Tire testing • All drive axle tires (2/32, 3/32, 5/32, 6/32) • Right steer axle tire (15/32) • Testing and simulation

  7. Tire Friction • Testing at 60 mph, all tested water depths • Steer axle tire friction = 0.28 to 0.30 • Right drive axle tire friction = 0.12 to 0.16 • Left drive axle tire friction = 0.10 to 0.15 • Speed, water depth, and tread depth affect friction • Drive axle tire friction equivalent to ice (0.12 to 0.25)

  8. Effect on Motorcoach Handling • Lower friction available for rear tires • Passenger car testing • Friction reduced when tires worn • Handling changes when worn tires are in rear • Differing friction on front and rear tires creates instability • Results in rotation and loss of control • Differing friction on left and right tires increases instability

  9. Tire Friction • Drive axle brakes locked sooner than other axles due to friction available • Earlier lock up of drive axle contributes to loss of control • If drive axle had same tread depth as steer axle, it would not have locked up • Driver would likely have been able to maintain control

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