V4Rs — Dura-Ace Di2 / ENVE SES 4.5

Monocoque frame with a proprietary laminate that varies by area. Colnago does not name a fibre grade, and the review describes the frame by its measured behaviour instead: 4 per cent stiffer in the sprint position and 5 per cent stiffer seated, both under the company's Real-Dynamic Stiffness protocol, which loads the bars and the bottom bracket at the same time.

The CC.01 cockpit presents 16 per cent less drag surface than the cockpits fitted to the V3Rs, and with the same wheels the complete bicycle measures 17.5 W ahead of its predecessor at 50 km/h and 90 rpm — a weighted average across yaw angles rather than a single-angle figure.

The module drops 47 g to 1,668 g, with the reduction in the fork and cockpit rather than the frame. Dura-Ace Di2 R9270 and the ENVE SES 4.5 at 50 mm front and 56 mm rear, on a 25 mm internal hookless rim. Size 530 carries 575 mm of stack, 395 mm of reach and 408 mm chainstays.