Rotor Flow Cranks

Robbie Ketchell, director of sport 
science at Garmin-Sharp, was the brains behind the new aerodynamic Rotor Flow Cranks, which is why they were first spotted on his team’s TT bikes at last year’s Tour de France.

The Flow’s shape was designed using Computer Fluid Dynamics (CFD) software, a program that simulates wind-tunnel testing. This allowed engineers to see exactly how the cranks, which feature Rotor’s trinity drilling system, interact with the bicycle while in motion.

Designed separately from the crank arms, the Micro Adjust Spider now offers adjustment increment gaps of 2.5° by using an alternative bolt-hole placement. The company claims that these new cranks can save a rider 26.4 seconds over a distance of 180km when riding at 200 watts, and has priced them at £399.99.

Available in 170mm, 172.5mm and 175mm (563g for the 175mm without chainrings) they aren’t the lightest offering from Rotor, which goes some way to explaining why they were only seen against the clock.

Contact: www.velotech-,

This article was first published in the January 17 issue of Cycling Weekly. You can also read our magazines on Zinio, download from the Apple store and also through Kindle Fire.