Aero bottles matter when you're riding at threshold or racing against the clock. The Chrono II takes the blocky shape of a traditional round bottle and narrows it down to slip through the air with less drag. The profile is designed to fill the void between your downtube and the front wheel, reducing turbulence where a round bottle would create drag. The dimpled surface texture works like a golf ball, helping airflow stay attached to the bottle rather than breaking away and creating wake.

The bottle holds 17 ounces and uses a clear body so you can see how much you have left without pulling it from the cage. The wide-mouth opening simplifies filling with ice or drink mix, and cleaning becomes straightforward since you can reach inside with a brush. The material flexes enough to squeeze for flow but holds its shape in the cage, so it doesn't collapse under pressure or get stuck during insertion. BPA-free plastic construction keeps things safe for regular use.

The spout valve flows consistently when you squeeze and seals tight when you're not drinking, preventing leaks when the bottle bounces around on rough roads. This bottle only works with the Chrono II cage system since the shape is designed to lock into the cage's extended arms. If you're running the original Chrono cage, these bottles won't fit. The UCI legalized this generation of the Chrono design, so it's compliant for sanctioned events.