Exclusive video: Shimano Dura-Ace Di2 11-speed

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Cancellara gets fitted with new electronic groupset

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The new four-arm chainring bolt circle is not radially symmetric. Instead, Shimano says the arms are aligned more with how forces are transmitted during the pedal stroke, adding more material where it's needed and removing it where it isn't. Replacement chainrings will almost assuredly be very expensive.(Image credit: Jonny Irick)

This video originally appeared on BikeRadar.