Shimano’s Tiagra SL-4660 Rapidfire Shifters will have your ride shifting quickly and efficiently. Designed specifically for flat bars with a classic MTB style in mind, the levers have three different actuations that deliver immediate shifting that is smooth and precise. Instant release immediately shifts a single gear, Multi Release allows multiple gear changes using both lever simultaneously, and 2-Way Release on the front shifter can swing forward and backward, allowing for use of both the thumb and index finger to shift. Polished grey, both levers have easy to read shift indicators and include barrel adjusters for fine tuning Note: Works ONLY with 10-speed setups that use Shimano FD-4600, FD-5700, or FD-6700 double front derailleursrnFeaturesIncludes: Two (2) shifting levers w/ shifting cables and barrel adjusters3 actuations: Instant Release, Multi Release, 2-Way ReleaseLow-friction designEasy to read indicatorsBarrel adjusters for fine tuningIntended for use with flat barsSpecsSpeed: 3x10spColor: Polished greyMaterial: AluminumClamp Diameter: 22.2mmShift Lever Actuation: Instant Release, Multi Release, 2-Way ReleaseFront Derailleur Compatibility: Shimano FD-4

With the advent of the XT Di2 RD-M8050 Rear Derailleur, Shimano’s Di2 has finally come to Deore XT, which may be the most popular drivetrain model in the world. The XT version is built for more aggressive terrain, features a much friendlier price point, and actually represents an upgrade on XTR in some ways. One of the biggest changes to XT’s version of Di2 is that it now wirelessly connects to Shimano’s E-Tube platform via Bluetooth. That means that you can initially set your drivetrain up at home with a computer or tablet and then make targeted adjustments using your smartphone while you’re on the actual trail. We don’t need to explain why this is so huge, and we fully expect it to break the typical product cycle model by trickling up to XTR. The XT Di2 rear derailleur does benefit from some trickle-down tech, including the Shadow RD+ switch and Synchronized Shifting. Shadow RD+ is the same toggle switch on the mechanical version. It lets you lock the derailleur in place, maintaining chain tension across funky terrain to eliminate chain slap and ghost shifting. Avoiding ghost shifts is especially important here considering the fact that the second feature, Synchronized Shifting, serves as a drivetrain babysitter by synching the front and rear derailleurs to ensure you’re always in an optimal gearing–obviously not terribly useful if you’re running a one-by rig. By putting the two derailleurs in communication with each other, Synchronized Shift can actually calculate your efficiency and perform simultaneous front and rear shifts to eliminate cross-chaining and set you up in the best chain line for any given gearing. These shifting patterns depends on the direction you’re shifting and the combination you’re shifting into. They’re wirelessly programmable via Shimano’s E-Tube system, so you can set your preferences in advance to ensure that your internally-communicating drivetrain isn’t conspiring against you. Another category of big winners in the Synchronized…

Designed for 2×10-speed drivetrains, the Shimano Tiagra ST-4600 Dual Control Levers feature compact lever bracket hoods made from soft rubber and anatomically shaped to allow easy braking and shifting regardless of hand position. New Super SLR lever design offers faster braking response and keeps operation friction to a minimum. Integrated Optical Gear Display shows how many gears can be selected either on the low side or top side for easier shifting control. Ergonomic brackets are reach adjustable through shims and light action release levers provide quick, smooth and easy shifting and braking. New Super SLR design makes use of a friction-reducing mechanism in the lever to improve response and modulation Outer routing of shift cable for efficiency shifting Provides light action and accurate brake control Integrated Optical Gear Display shows which gear position is selected for easier shifting control while riding Integrated cable adjuster allows tension adjustment while riding Ergonomic and slim bracket shape is reach adjustable through shims to accommodate smaller hands 2 sizes of combination shims allow narrower lever reach by 7.5mm or 14mm Compatible with 2×10-speed drivetrains Sold as a pair

diverter (10 speed, double). indexed derailleur dual sis. compatibility with dishes sg-x. wide inner and outer link. optimum spring tension. 10% less spring tension to fd-6600 to provide a slight change and a smooth journey. smooth shifting under heavy loads in all rear positions. capacity: 16 d. weight: 89 g.