Both Royal Enfield and Harley Davidson motorcycles have distinct sounds that are often associated with their brands. However, it is generally accepted that Harley Davidson motorcycles are louder than Royal Enfield motorcycles.
Harley Davidson bikes are known for their deep, rumbling exhaust notes, which are a result of their large-displacement V-twin engines. These engines produce a characteristic low-frequency sound that is often described as a "potato-potato" or "thumping" sound. Harley Davidson motorcycles often have aftermarket exhaust systems that further enhance the sound.
On the other hand, Royal Enfield motorcycles typically feature single-cylinder engines, which produce a different sound compared to Harley Davidson's V-twin engines. Royal Enfield bikes have a distinct thump, but it is generally not as loud or deep as that of Harley Davidson motorcycles.
It's important to note that the actual loudness of a motorcycle can vary depending on several factors, including the model, engine modifications, and the specific exhaust system installed. Additionally, local regulations and laws may impose noise restrictions on motorcycles, which can affect the overall sound levels produced by both Royal Enfield and Harley Davidson bikes.