A2B Lithium Ion 7 Speed Electric Bicycle By Ultra Motor 500w/36v **Upto 40 Miles on a Charge. Unassisted power on demand for up to 20 miles at a cruising speed of 20 mph. Easily upgraded to double its range to 40 miles with the addition of a secondary battery pack and increase its carrying capacity with the addition of baskets and rear carrier bags. 500 W Motor, 36 V Lithium Ion Battery built in to frame (Fully charges in 3.5 - 4 hours.). 3" Wide thorn resistant tires. Full Suspension.