A NuVinci bike effectively has an infinite number of gears. ... practical city bike such as the Novara Gotham, which packs a NuVinci N360 hub and a Gates belt drive, for $1,299.

Unless you're majoring in spandex and minoring in too-cool-for-school at Steephill State, you may not need a road, fixed-gear or a mountain bike. Consider REI's Novara Fusion commuter.