I don't know a lot about motorcycles but I have heard of Harley-Davidson 
Yeah, the Harley-Davison motorcycles are awesome. They're an American motorcycle founded in Milwaukee in 1903. My dad drives one!
Awesome! Are they the most popular motorcycle brand in the US?
Definitely! They're also one of two American motorcycle companies to survive the Great Depression. The company has been going strong for years making good bikes.