Spotted: Giant Propel Disc prototype at the Tour de France

This article first appeared on BikeRadar.

Giant appears poised to launch a disc version of its Propel aero bike, given the machine that Team Sunweb‘s Michael Matthews is dialing in for the Tour de France.

The Giant Propel Disc frameset looks to be production-ready. The Propel Disc’s striking stem – which encases the Shimano Dura-Ace Di2 wires and hydraulic lines – is unmarked and alloy, and may or may not be in final form.

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While both Sunweb and Giant were tight-lipped about the bike, there are a few discernible points about the bike worth noting.

The original rim-brake Propel features a very slender, hourglass head tube. The Propel Disc has a stouter head tube, presumably for more front end lateral stiffness.

The down tube on the new Propel Disc is massive, as is the junction above the bottom bracket. Hello, frame stiffness.

You can read more at Cyclingnews.com