Take control with Shimano Di2 electronic shifting. Change gears with instant precision at the click of a button – even under a heavy load while climbing or sprinting. On MTB, Road or Comfort bikes - in any weather conditions and on any terrain - all you have to do is enjoy riding.
No effort, no friction, no loss of power, no delay, no adjustment.
Discover all of the benefits in this first edition of ‘The Science of Cycling’.