Rectangular cross-sections slip through the air more cleanly than round bottles, but flat-sided bottles have a reputation for popping out of standard cages over rough roads. The Cervelo Aerobottle 500 solves this with a proprietary cage that clips the bottle in place rather than relying on friction alone. You get the aerodynamic profile without worrying about your hydration bouncing onto the tarmac when you hit a pothole mid-race. The system ships as a complete package—bottle and cage together—so everything fits correctly from the start.

The bottle itself holds 500ml and uses a molded construction that maintains its shape under squeeze pressure. The black finish matches most race builds without adding visual clutter to your downtube. What makes this system work is the positive engagement between bottle and cage—the bottle clicks into position and stays put through vibration, acceleration, and the kind of road surfaces you encounter in time trials and triathlons where course conditions vary wildly. You're not fighting the bottle to get it seated, and you're not fighting it to get it out when you need a drink.

At 128 grams for the complete package, you're not adding significant weight compared to a standard round bottle and alloy cage combination. The capacity sits in the sweet spot for most race distances—enough hydration for an Olympic-distance triathlon or a 40K time trial without the bulk of larger bottles that can interfere with knee clearance on aggressive aero positions. If you need more capacity, many riders run two of these on frames with dual bottle mounts.... Read More