Why are some honda sport motorcycles CBR and others are CB?

I have never understood why some models are the CBR 250 or the CBR 650 but others are the CB500 etc. What is the significance of the R?

The R are sportbikes

It means whatever the manufacturer wants it to mean. There's no special significance.

Race styling.

CB

Nobody has ever called a CB500 a "sport" bike.

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