The 2027 AMA Supercross Championship Rulebook will lower the maximum sound level for professional off-road motorcycle racing from 112 dB to 109 dB, with the new standard set to take effect at the 2027 Monster Energy SMX World Championship season opener. The rule will apply to all bikes subject to sound testing, and penalties will be imposed for noncompliance.
The season opener is scheduled for Jan. 9 at Angel Stadium in Anaheim, California. The new standard was developed with manufacturers, the SMX League, AMA Pro Racing and the American Motorcyclist Association, and it is intended to create a single competition benchmark for motorcycle noise while helping preserve riding areas, venues and community access.
All manufacturers competing in SMX League events have committed to producing motorcycles that meet the new limit. KTM, Yamaha, Honda, Kawasaki, Suzuki, Ducati and Triumph said they support the change, and league and manufacturer officials said the lower limit should improve consistency for teams, support global alignment and provide practical benefits for event operations and broadcasts.
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