Overall, the electric drive seems to be doing everything we'd expected. The wheels, on the other hand, have continued to present challenges. During our test runs in Florida, we'd operated the vehicle under load, and had even found a few short but relatively steep hills to test gearing and climbing ability. The vehicle's rear wheels were built on sturdy mountain bike rims, and held up quite well through more than 400 miles of test rides. But there was one more factor that we failed to anticipate – one that did not come into play on the mild curves typical of Florida roads. Now, as we are moving into hill country, and coasting through some tight downhill curves after each climb, we are discovering an additional stressor created by the geometry of the vehicle.