I compared this model to the A20 and both listed an optional back rack, is that included or a separate purchase? the A20-B doesn't even show it in pictures.

The A20-B model mentions 'optional rear shelf,' indicating that it is not included and must be purchased separately.

Questions & Answers: AOSTIRMOTOR A20 500W Folding Electric Bicycle for Adults , 20" * 4" Fat Tire, with 36V 13AH Removable Lithium Battery, Travel Up to 20 Miles, Max Speed Up to 25 MPH(Black)

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AOSTIRMOTOR A20 500W Folding Electric Bicycle for Adults , 20" * 4" Fat Tire, with 36V 13AH Removable Lithium Battery, Travel Up to 20 Miles, Max Speed Up to 25 MPH(Black)

500W Motor and Removable Lithium Battery -- Our Folding electric bike with 500W high speed motor and Removable 36V 13ah Lithium Battery supports 25mph speed, Range Distance 15-20 miles. Suitable height: 5'4-6'2.Load capacity: 270LBS.
High Quality and Small Size -- The folded size is: 35x28 inch. We use lightweight and strong 6061 Aluminum Alloy collapsible frame.
Three modes -- Our ebike has three working modes: Riding mode/Electric mode/Power-assisted mode.
Fully Equipped and Easy to Assemble -- Arrives 90% Assembled. Our Ebike is equipped with 20x4 inch fat tires, F/R disc brakes, 866-LCD display, F/R fenders, SHIMANO outer 7 speed.
A one-year warranty service -- For any reason, if you are unsatisfied with our Bicycle, we will provide quality after-sales service.

$489^.00 –