in a pro motocross race the best riders compete using a crf450r leaving the other yamahas, kawasakis, and suzukis in the dust
a 450cc 4 stroke dirtbike made by honda
"in a pro motocross race the best riders compete using a crf450r leaving the other yamahas, kawasakis, and suzukis in the dust" What is the definition of "crf450r"?