Giant unveils the fourth generation of the Propel, an aero race bike that should be simultaneously lighter, more aerodynamically efficient and more practical to maintain than its predecessor. The new machine is 355 g lighter than the third generation and, according to Giant, delivers an aero gain of 18.4 W at 40 km/h. Sister brand Liv launches in parallel the revamped EnviLiv-series on the same technical basis.
Where is the profit?
The frame is made up of Advanced-Grade Composite with tube profiles that Giant describes as “truncated ellipse airfoils”, truncated elliptical cross-sections that require less material than classic drop shapes while responding more stably to crosswinds. The technology behind it, AeroSystem Shaping, combines CFD analysis with dynamic wind tunnel testing to minimise drag at varying yaw angles.
The OverDrive Aero-stem, a D-shaped steerer, allows internal cable routing from handlebars to frame. Tyre clearance goes up to 32 mm, in line with the wider industry trend towards tubeless setups at lower tension.
Sleek cockpit
The most striking update is not in the frame but in the Contact SL Aero-cockpit. Anyone who has ever swapped spacers or adjusted handlebar width on fully integrated aero handlebars knows the problem: hydraulic brake lines adding unnecessary complexity. Giant has redesigned the cable routing through stem and headset so that cockpit components can be changed and adjusted faster, without completely dismantling the hydraulic brake system.
This adaptation makes cockpit adjustments in the workshop easier. Liv EnviLiv: same basis, own fit
The Liv EnviLiv shares AeroSystem Shaping technology and the Contact SL Aero cockpit with the Propel, but differs on the contact points. Shorter cranks (from 160 mm on size XXS), narrower handlebars (from 360 mm) and female-specific geometry should make for a bike that not only fits on paper but also offers control on the road. The flagship model, the EnviLiv Advanced Pro 0, is available with SRAM Force AXS including Quarq-powermeter or with Shimano Ultegra Di2.
Specifications in brief
- Weight savings: 355 g vs. generation 3
- Aero gain: 18.4 W at 40 km/h
- Maximum tyre size: 32 mm
- Brakes: hydraulic disc brakes, 160 mm for / 140 mm behind
- Axles: 12×100 mm front, 12×142 mm rear
The Propel Advanced 1 with Shimano 105 Di2, carbon SLR 2 50-wheels and Gavia Course 0-tubeless tyres are priced in the US at $5.500. European prices have not been fully confirmed at the time of writing.
Where does the Propel stand now?
The figures are brand claims until independent weighing and test rides follow. The cockpit revision is the most immediate adjustment for anyone servicing their own bike.
