M-rated helmets are designed specifically for motorcycle racing and similar motorsports, and offer less protection than SA-rated helmets. Snell M Helmets (designated as Snell M2015 or M2010) They are designed for auto racing and provide the highest levels of impact resistance and fire protection. There are three different classifications for Snell-rated helmets: Snell SA Helmets (designated as Snell SA2015 or SA2010) Most racing classes won’t accept helmets approved solely by the Department of Transportation. There is a difference between DOT-approved and Snell-approved helmets. For circle track racing, different rules and requirements are specific to each racetrack. In drag racing, the respective rule books for NHRA and IHRA, as well as smaller racing organizations, have those details. This is another instance in which reading the rulebook carefully is not just worth your while, but strongly encouraged. It is common for racing organizations to allow use of helmets with both the current and previous specification - meaning a Snell 2010 helmet may be allowed in your league, but you are ultimately responsible for determining what safety equipment is required and appropriate for your particular brand of racing.
Snell releases new ratings every five years. Helmets are rated by the Snell Memorial Foundation, and in most instances, a helmet’s Snell specification will dictate whether it is suitable for a particular racing application, or allowed by a motorsports sanctioning body. While SFI specifications are the thing by which most auto racing safety equipment is measured, your helmet is a different animal.
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