350w lithium ion e bike is suitable to male and fema & teenagers. The 20 mph e bike is a 350w e bike with speed at 35 km/h. The lithium ion e bike is also called ebike road bike or pedal e bike. As 350w e bike with assist pedals, its 48V 13AH lithium ion e bike have speed at 35 km/h & range at 50km or above. 20 inch fat tire 20 mph e bike is installed with 48v 13Ah lithium ion battery matching this ebike road bike . The max speed for the lithium ion 20 mph e bike is 22 mph or 35 km/h. The 350w pedal e bike with 7 speed gearshift can meet the different speed requests for drivers. In most countries, 350w e bike can meet most drivers' demands covering male & female & teenagers. In Europe, 250w lithium ion e bike with pedal assist is street legal demands for this 20 inches fat tire electric bike. If you want stonger power, you can choose other models with 500w or 750w. If you want to charge the lithium ion e bike at home, you can take the lithium battery out of the fat tire electric bik