Dislikes: No quick-release hubs and no fixed gear. Also, it changes gears every time you brake, which can be annoying at first.
Caraci Fixed-Gear F5.0: Aluminum-framed fixie with front and rear brakes and aero wheels.
Likes: Striking looks, with matching neon green paint on the hubs and grips, white tires, deep rims, bladed spokes and a unique frame design with an internally run cable. Includes a flip-flop hub for freewheel coasting. Steel-framed model is $30 less.
Dislikes: No water bottle hardware or quick-release hubs.
Price: $335 to $420; available in late November. (626) 213-1318; http://www.caracibike.com
Wallack is coauthor of "Bike for Life: How to Ride to 100" and "Barefoot Running Step by Step." firstname.lastname@example.org
[Correction 6:38 p.m., Nov. 9: An earlier version of this article incorrectly said the Pure Fix Cycles Kilo is $325. The correct pricing is $399.]