Michelin puts tires to work for rigid dump trucks

  • 28-Mar-2011 12:18 EDT

Featuring what Michelin describes as a "self-cleaning tread pattern," its XDR2 tire combines full-depth blocks, a 13% larger central lug (compared to the XDR tire), and a new nondirectional design.

Michelin Earthmover's XDR2 tire for rigid dump trucks used in severe mining and quarry applications offers up to 20% more tread life than its predecessor, the XDR, according to the company.

“The XDR tire is the benchmark on haul trucks in quarries around the world, and has been for many years," said Luc Minguet, President of Michelin Earthmover Tires. "This new XDR2 tire builds on that foundation to deliver even more productivity [and] better performance, leading to a lower total cost of tire operation.”

In addition to the increased tread life, the XDR2 tire also delivers up to a 10% thicker undertread between the protective plies and tread base for better cut and impact resistance. Featuring what is described as a "self-cleaning tread pattern," the XDR2 tire combines full-depth blocks, a 13% larger central lug (compared to the XDR tire), and a new nondirectional design to provide increased protection against aggressions and cut separations. The evolving tread design provides an increased contact patch as the tire wears, while sculptured cooling vents help keep running temperatures low.

Engineers incorporated Michelin's C2 Technology in the XDR2's casing to provide an overall cooler operating temperature, maximizing the potential life of the tire without compromising operating speed or load-carrying capacity.

Compared to the XDR tire, the steel protective plies are 60% stronger to provide a significant improvement in shielding the tire against aggressions and separations. The XDR2 tire also provides twice the sidewall thickness of the previous generation to resist cuts and abrasions.

Michelin says that the XDR2 tire underwent more than 2 million h of real-world testing at its Almeria, Spain, proving grounds—which it claims is the only dedicated earthmover tire testing center in the world—and other challenging environments and sites across the globe. The extensive testing aided in the fine-tuning of the overall performance characteristics, including longer tread life, improved damage resistance, and greater environmental consciousness through raw material conservation.

In terms of the environment and conserving natural resources, Michelin took advantage of advanced design techniques to use nearly 10% less materials than "the leading competitive 49-in OTR [off-the-road] tire." The reduction in materials means a lighter tire, which contributes to additional fuel savings. The tires are produced in ISO14001-certified facilities and are free of aromatic oils.

The XDR2 tire, introduced in March, is available in a 27R49 size, with additional sizes available later in the year.

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