Measurements from the manufacturer’s website:
Mothership has this item for a few bucks less, and the ebony color version for a lot less:
Sadly not seeing the price on my side, although it could just be a me issue. 
The specs say this, and the the product’s home website agrees.
Equipped with peak 1500W motor, this isinwheel R6Pro electric bike can reach to more than 35+ mph and conquer 30% slope climbing effortlessly. Enjoy thrill and free riding wild with this robust electric dirt bike.
35+ is also 20+, but be aware that it can reach 35mph.
Ebony is limited to 20mph; black version says 20+. Different generations?
Not sure. Info isn’t super clear.
Dang dynamic pricing
Dynamic/focused/whatever baloney justification they use.
Equally annoyed with this nonsense, but I get it’s because of the state I live. Woot has let things go through that Amazon has refused to ship.
Interesting.. the ebony says it will do 35 mph. And it is a lot cheaper.. isn’t ebony pretty much the same as black?
What are the odds this is UL listed? There’s a tax rebate in my state with e bikes made to UL 2849 or EN 15194 standard.