In Harley-Davidson motorcycles, FXR and FXD are model designations that refer to different series of bikes. Here's what each abbreviation stands for:
FXR: The FXR series was a line of Harley-Davidson motorcycles produced from 1982 to 1994. The abbreviation "FXR" stands for "Factory Experimental Racing." The FXR models were known for their frame design, which featured a rubber-mounted engine and a more advanced suspension system compared to other Harley-Davidson models at the time.
FXD: The FXD series is another line of Harley-Davidson motorcycles. The abbreviation "FXD" stands for "Super Glide." The FXD models are characterized by their Dyna chassis, which offers a combination of a traditional-looking frame with modern suspension components. The Dyna series is known for its balance between a classic cruiser style and improved handling dynamics.
It's worth noting that Harley-Davidson has used various model designations throughout its history, and these abbreviations can change or be expanded with different model years and variants.