XB-300-SLA Electric Power Mountain Bike A high tech silicon powered electric bicycle with a 300 watt rear hub motor, all steel standard 18 inch frame, 26 inch aluminum wheels, hydraulic shocks & off road tires. The 300 watt rear hub motor is powered by a removable sealed battery pack. The 7 Speed Shimano gear system is top of the line. A fast electric bike doing 20 mph for 20 miles per charge!