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eSkute (Brand+) Store via [aliexpress.com] has ESKUTE 1200W Peak 48V 10.4Ah 27.5-Inch 21-Speed Electric Mountain Bike, 28 mph on sale for $280 when you Apply $70 off Coupon at checkout: USAFF70. + Free Shipping from US warehouse.

The 21-speed drivetrain gives you a wide range of gears for handling flat surfaces, hills, and mountain terrain.