image from manufacturer
The only difference between Oreck U2000R-1 and U2000RB-1 is the Belt.
The U2000RB-1 is equipped with the long-lasting Endurolife Belt which is designed for long life, Oreck claimed that this belt does not need replacing.
While the belt on the U2000R-1 is recommended to be replaced every 6 month.
Btw, the U2000RB-1 retail price is about $20-$30 more expensive than the U2000R-1.
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Please share your review here if you know other difference between these 2 Oreck U2000 upright vacuum cleaners, thanks.