Motorcycles in the Dakar Rally Ride on Michelin Tires

MICHELIN is taking part in the 2011 Dakar Rally (Moto class event) – December 30th – January 16th, alongside its official partners KTM, BMW, Aprilia and Yamaha – with the MICHELIN Desert
Race tires developed specifically for the new 450cc bikes.

The new tire is the result of MICHELIN’s 30 years of experience in cross-country rallying.  Developed by engineers at the MICHELIN Technology Center in Clermont-Ferrand, the MICHELIN Desert Race has been adapted for the new 450cc prototype factory bikes.  The 450cc bikes developed by manufacturers make different demands on tires than the 690cc bikes of the past,” explains Christopher Chatras, head of off-road motorcycle racing. “The new machines are lighter, their weight is apportioned differently and the engine power is more effectively managed and transferred to the ground. In fact, the 450cc factory bikes deliver very high performance and thus make considerable demands on tires. The new MICHELIN Desert Race was developed for use with these new-generation motorcycles. It’s a versatile product that is suitable for the Dakar Rally’s different kinds of terrain, such as rocky trails and sand.

The B-mousse puncture-resistance system was developed in the early 1980s by MICHELIN, which won the 1983 Dakar Rally with Hubert Auriol. Bib-mousse is a ring of foam that provides constant tire pressure of 1.2 bar. Bib-mousse technology eliminates inner tubes and thus the need for air-inflated tires. It’s lighter than an inner tube and delivers superior performance thanks to end-of-process weight gains. But above all Bib-mousse is reassuring to riders. Because the ring of foam is highly impact-resistant, it prevents the sudden blowouts that bikers fear.

Since last summer, the new MICHELIN Desert Race has undergone some 3,000 kilometers of tests in race conditions, including a number of stages of the Shamrock Rally. The results speak for themselves.”

The MICHELIN Desert Race has a symmetrical tread that is deeply grooved on the shoulders, with more widely spaced tread blocks. The new tread delivers improved handling, grip and responsiveness and makes it easier to maintain a trajectory without sacrificing the longevity and versatility that have built the reputation of MICHELIN’s cross-country tires. The MICHELIN Desert Race was designed for use with the Bib-mousse safety system.

Two Wheels Safer Than Four

Baltimore:  In research that may surprise off-road riding enthusiasts and safety experts, a Johns Hopkins team has found that crashes involving ATVs — four-wheeled all-terrain vehicles — are significantly more dangerous than crashes involving two-wheeled off-road motorcycles, such as those used in extreme sports like Motocross.

The Results

The research, to be presented at the American College of Surgeons’ 2010 Clinical Congress in Washington, D.C., this week, found that victims of ATV crashes were 50 percent more likely to die of their injuries than similarly injured victims of off-road motorcycle crashes. ATV victims were also 55 percent more likely than injured motorcyclists to be admitted to a hospital’s intensive-care unit and 42 percent more likely to be placed on a ventilator.

“There’s a belief that four wheels must be safer than two,” says Cassandra Villegas, M.P.H., a research fellow at the Johns Hopkins Center for Surgery Trials and Outcomes. “But we found the opposite. People involved in ATV crashes are more likely to die or suffer serious trauma.”

The growing popularity of off-road vehicles in the United States has led to a steep rise in the number of injuries resulting from their use. In 2000, Villegas notes, there were 92,200 injuries involving ATVs or off-road motorcycles; in 2007, the last year for which data is available, there were 150,900 injuries. But little rigorous research has been done to determine which vehicles may be riskier than others.

ATVs and off-road motorcycles are designed for recreational use, not use on city streets, and typically are ridden on trails, sand dunes and other rough terrain.

Study Details

In the first study to compare the severity of injuries sustained by ATV versus off-road motorcycle riders, Villegas and senior author Adil H. Haider, M.D., M.P.H., an assistant professor of surgery at Johns Hopkins, reviewed data on nearly 60,000 patients who suffered an injury after a crash involving one of the vehicles between 2002 and 2006.

The researchers say they don’t know why ATV crashes lead to greater injury and mortality, noting they cannot trace the differences solely to helmet use even though 60 percent of motorcyclists were wearing helmets as compared to 30 percent of those in ATV crashes. Even when both types of riders had been wearing helmets, ATV riders still experienced worse injuries and outcomes than motorcyclists, Villegas says. Only a few states have laws requiring the use of a helmet when riding an ATV, says Villegas, and while motorcycle helmet laws are also determined by states, many more have helmet-use laws for motorcycles.

Possible Factors

The researchers say it’s possible that ATV riders wear less protective clothing than off-road motorcyclists when they head out, sometimes little more than shorts and a T-shirt. Another contributing factor could be the significant weight of ATVs, which can cause severe crush injuries when they land atop victims and lead to a greater likelihood of internal organ or extremity damage, Villegas says.

Villegas says that these findings may allow parents, legislators, educators and those in the ATV industry to make better decisions about the use of the off-road vehicles. She also says that studies like these could help ATV manufacturers design and implement increased safety technology in ATVs, similar to how automobile manufacturers have used research to make safer cars and trucks.

Hopkins researchers Stephen M. Bowman, Ph.D.; Eric B. Schneider, Ph.D.; Elliott R. Haut, M.D.; Kent A. Stevens, M.D., M.P.H.; and David T. Efron, M.D., contributed to this study.