The Tech 3 master cylinder can operate all the calipers from our range & offers a slight increase of power of about 5% over the Tech Evo. Popular design features of Tech Evo remain the same, such as the reach & bite point control (BPC)adjustability. The piston is actuated by a cam & a roller system to eliminate any free play & initial friction. The classic split clamp design makes the master cylinder easy to install on the handlebars without having to remove anything else. The Tech 3 master cylinder is now directly compatible with any Shimano I-Spec type shifter meaning no extra mount is required to attach the shifter to the master cylinder. For those using SRAM shifters we have designed a slick & minimalistic direct mount adaptor. E4 Caliper Specifications: On the fly BPC (bite point control) & Reach adjustment 5% power increase over TECH Evo master cylinder Handed master cylinders for better integration on the handlebars New piston dust cover design New reservoir