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TT-reminiscent shaping. Color-matched wheels. Swaths of carbon fiber that shimmer like sapphires in direct sun. The AC1 makes you feel fast before you even saddle up—and the ride is just as beautiful as the bike. This is Blue’s second iteration of the AC1, and you can see the experience in the smart internal cable routing, slick seatpost clamp, and modern livery (tapered headtube, BB30 bottom bracket). While the bike holds speed like a runaway train (“Fastest steed in the bunch,” declared one tester), it also took the edge off bumps that knocked our retinas loose on other aero bikes. And then there’s the Ultegra Di2 electronic shifting, which won over even the Luddites in the test, who admitted that it’s appreciably quicker and more accurate than mechanical. “You can be a total boob and still not miss a shift,” one exclaimed. “It’s silly good.” That goes for the entire bike. 16.1 lbs
HANDLING: 4
RESPONSIVENESS: 4.5 (OUT OF 5)
