Green X Challenge

The MICHELIN® GREEN X® Challenge, a first class, world-class environmental competition, challenges all American Le Mans Series prototypes and GT entries in the field to race in an ecological way.

America’s premier environmental motorsports competition, the MICHELIN® GREEN X® Challenge enters its third season of American Le Mans Series competition in 2011. The MICHELIN® GREEN X® Challenge recognizes the Prototype and GT category cars that prove “cleanest, fastest, most efficient” in the race within each ALMS event.

Overseen by the Green Racing steering group composed of members of the U.S. Department of Energy, the Environmental Protection Agency, SAE International and IMSA, the scores are determined by measuring well-to wheel oil consumption and emissions, race speed, energy use, and vehicle weight against category competitors.

First introduced by Michelin in 2006 as an Energy Efficiency award at the 24 Hours of Le Mans, the program was extended to the full European-based Le Mans Series in 2007 and launched in North America in early 2009 as the MICHELIN® GREEN X® Challenge.

The MICHELIN® GREEN X® Challenge awards are now a fixture at virtually every major sports car endurance event worldwide, including the 24 Hours of Le Mans, the American, Asian and European Le Mans series, and the new Intercontinental Le Mans Cup series events.

American Le Mans Series

MICHELIN GREEN X Challenge

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  • This three-digit number represents the width of the tire in millimeters (mm), measured from sidewall to sidewall. Since this measure is affected by the width of the rim, the measurement is done when the tire is on its intended rim size.  <div><img src="/assets/mi/system/images/contextual-help/R2-width.png" /></div>
  • The aspect ratio is the relationship of a tire's sidewall height to its section width, expressed as a percentage. In this example, the tire sidewall height is approximately 55% of the tire width. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall.<div><img src="/assets/mi/system/images/contextual-help/R2-aspect.png" /></div>
  • The diameter of the rim in inches.<div><img src="/en_CA/assets/mi/system/images/contextual-help/R2-diameter.png" /></div>
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