E Spike is a modified 8 Speed Spike 1- It uses an integrated system by a Japanese company called Dapu. It ifeatures a 350W Geared Hub Motor, a special Cranket with sensors, a 36V 13 AH Rack Mounted Battery with built in light, and a Digital Display. With this system you can choose between throttle only or 6 different levels of pedal assist.The 36v 13AH battery is much larger than other manufacturers use and will give you a much longer range- about 25 miles electric only and up to 70 miles using pedal assist. This entire package only adds 18.5 Lbs to a Spike! Schwalbe Big Apple 20 x 2.0 Tires , Microshift Trigger Shifter, and Avid BB5 Brakes are standard equipment.