I bought a 700c geared front hub lithium kit from Amped Bikes for my wifes 2001 Schwinn Sierra 700 limited edition and except for the speed have been very happy with it. They say on their web site 21-22 mph on the level with no peddling but it will only go 18-18.5 maybe 19. The geared front hub is about half the size and weight of a direct drive hub and has zero drag. The lithium battery bolts on where the water bottle holder was and is locked in place and is easily removed for charging or securing and provides less weight and longer range than SLA(sealed lead acid) batteries and we have gone as far as 34 miles in hilly terrain with no problems. Before this conversion my wife would seldom ride with me and now she goes all the time and easily zips away from me on hills. Be aware that front hub conversions need a bike with a steel fork as aluminum or magnesium forks will eventually break from the torque of the motor. This kit was bolt on and plug and play and has been absolutely trouble free.