Clean Republic Hill Topper kit will convert your bike or tricycle into an electric bike. With only 5 minutes and a wrench, you can put a motor on your front wheel to help you climbing the hill or just make biking much more enjoyable. The 250w 24 volt motor makes our kit the lightest one in the market. It provides the power assist equavalent to an adult rider. Top speed is around 15-18 mph depends on wheel size. Comparing to rear wheel kit, this front kit doesn't give you any drag if you don't engage the motor. You can ride like a normal bike when you want and engage the motor when you need. The kit comes in 2 battery options: 10 mile battery ($595.59, 6Ah Li-ion Cobalt) / 20 mile battery ($879.59 10Ah Li-ion Cobalt). Choose your wheel size and battery size in the drop down menu under the title. The test environment of the battery range is: 170 lbs rider, normal bike, flat terrain, WITHOUT pedaling. More information please go to our website at www.electric-bike-kit.com/hill-topper.aspx OR you can call us at 1-855-743-3279