Its aero frameset
The Propel’s frameset is designed to cheat drag with few compromises, and is the result of wind tunnel work and CFD (Computational Fluid Dynamics), while Giant’s Advanced-Grade Composite provides a good balance of compliance and stiffness. It has a slim hourglass head-tube, and the fork crown is recessed in to the down-tube, minimising the gap between front wheel and frame. The Kamm tail and wing profiles, and hidden V-brakes, ensure maximum aero efficiency.
£2149
Its comfort and handling
Carbon creativity has come a long way, and the Propel’s ride is on a par with a decent non-aero road frame despite its aerodynamic intent. It minimises vibration and smooths out bumpy surfaces impressively, yet still handles nimbly thanks to the oversized, tapered steerer tube, PowerCore bottom bracket area and chunky chainstays.
Its specification
You can get a better equipped Propel for less than the Advanced Pro 2, but what you’re paying for here is a higher-spec frameset. You’re still well looked after, though, with a Shimano 105 drivetrain, Giant’s SpeedControl brakes, good alloy cockpit, carbon seatpost and comfortable saddle – and Giant’s Ride Sense device, which transmits speed and cadence data.
ONE THING WE’D CHANGE Narrow tyres on a 2016 aero bike?
Such a frame demands aero wheels, and Giant’s SL 1 hybrid wheels look the part with their carbon fairing, and aluminium rim bed and braking track. The rims are 55mm deep and 23mm wide, the wheels are stable in changeable winds and fast when descending or on the flat, plus they stop well. But they’re not natural climbers – and the 23mm tyres don’t make the most of their width either.