The Extrbici mountain bike XF770 has electric assist. It has a folding frame which comes in black/green, black/white or black/red colours. It is designed for riders between 165-190cm and weighing up to 330lbs. It has a 500w high power brushless motor and three power modes It has a 48v 10Ah Panasonic battery. It can go up to 30 km/h and so helps you to move along more quickly or have a rest while you are cycling. The Shimano transmission system is smooth and accurate. There is a hydraulic disc brake which is sensitive and efficient and therefore really safe. There is also full suspension which means that the ride is very smooth.