Dura-Ace ST-R9170 Di2 Hydraulic STI Lever Set by Shimano
Shimano's Di2 drivetrain continues its evolution and with the release of the Dura-Ace ST-R9170 Di2 Hydraulic STI Lever & Disc Brake Caliper, an entirely new hydraulic disc brake system comprising STI shift/brake levers and new flat-mount calipers. Previous versions of the top-tier Di2/Hydro levers and calipers were handled by the ST-R785 set, a model that wasn't confined to a group and most likely a place holder until the UCI decided its stance on road bike disc brake use in competition. This marks the first time we see hydraulic disc brakes under the Dura-Ace moniker and we couldn't be happier. Shimano's excellent E-Tube project offers customizable shifting set-up so no matter your cycling discipline, you are fully in control in how you program your shifting. Sold as individual right and left levers, the levers include specific BR-R9170 flat mount brake calipers and hydraulic hose kits. Shimano's Di2 shifting is the gold-standard in which all other shifting is compared, so we're understandably excited that a hydraulic disc brake option now exists that proudly wears the Dura-Ace badge. Mating superior all-weather braking power and modulation with the industry's best shifting creates the most desirable components for your current drop bar bike or your next dream build. The ergonomics of the new 9170 hydraulic lever are nothing short of phenomenal. The lever is much slimmer than before and is very similar to the silhouette of the non-hydro Di2 and mechanical versions of 9100. Shimano also worked on making the clicks more positive, which provides great feedback when operating the levers in freezing conditions with thick gloves, during a muddy 'cross race, or over washboard gravel roads. The ability to integrate satellite buttons for climber and sprinter shifters carries over from previous versions, but the new textured hoods provide excellent cushion and grip when you're shifting at the levers. They also simply disappear when we're riding. We're not surprised...
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Shimano Dura-Ace ST-R9170 Di2 Hydraulic STI Lever Set
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