How Loud Is a Motorcycle? Decibel Levels Explained

How Loud Are Motorcycles Really?

A motorcycle at idle typically produces around 80–85 decibels, roughly equivalent to a loud alarm clock or a garbage disposal. Under acceleration, noise levels climb to 90–100 dB, and some motorcycles with modified exhaust systems can exceed 110 dB—louder than a chainsaw.

What many riders don't realize is that wind noise is often a bigger threat to hearing than engine noise. At highway speeds of 65 mph or higher, wind noise inside a helmet can reach 95–105 dB regardless of the motorcycle's exhaust volume. This means that even riders on relatively quiet bikes are exposed to potentially damaging noise levels during every highway ride.

The combination of engine noise and wind noise makes motorcycling one of the most noise-intensive recreational activities. A one-hour ride at highway speed exposes a rider to noise levels that exceed OSHA's recommended safe exposure limits, making hearing protection essential for any ride longer than a short trip around town.

Decibel Levels by Motorcycle Type

Motorcycle noise varies dramatically depending on the style, engine configuration, and exhaust system:

• Electric motorcycle: 50–75 dB — nearly silent compared to combustion engines
• Standard/commuter bike (stock exhaust): 80–88 dB — compliant with most noise regulations
• Sport bike: 85–95 dB — higher RPM engines tend to be louder
• Cruiser (stock Harley-Davidson): 80–92 dB — V-twin rumble at characteristic frequencies
• Cruiser (aftermarket pipes): 95–110+ dB — straight pipes can exceed legal limits
• Dirt bike/motocross: 94–100 dB — two-stroke models tend to be the loudest

Many jurisdictions enforce motorcycle noise limits, typically set between 80 and 86 dB measured at a specific distance and RPM. The EPA standard for new motorcycles manufactured after 1986 is 80 dB at 50 feet. However, aftermarket exhaust systems frequently push bikes well beyond legal limits, and enforcement varies widely by location.

Hearing Protection for Riders

Studies have shown that motorcycle riders experience noise-induced hearing loss at significantly higher rates than the general population. The Motorcycle Industry Council recommends wearing earplugs on every ride, and many experienced riders consider them as essential as a helmet.

Foam earplugs with an NRR of 32–33 dB are the most affordable and effective option. They reduce wind and engine noise to safe levels while still allowing you to hear traffic, horns, and sirens. Custom-molded earplugs designed specifically for motorcyclists attenuate wind noise while preserving important ambient sounds.

To check the noise levels of your specific bike, consider using a sound level meter to measure exhaust noise at idle and under acceleration. This data can help you choose the right hearing protection and verify that your exhaust system complies with local noise ordinances.

Measure It Yourself

Want to check your motorcycle's noise output? Use our free online decibel meter to measure the sound level at idle or during a stationary rev test. Position your device about 20 inches from the exhaust pipe at a 45-degree angle for the most representative reading. Compare your results with our decibel comparison chart to see how your bike compares to other common sound sources.