The new SRAM Apex is the perfect blend of technology and performance, so all riders can challenge their personal limits. The Sram Apex has double chainrings, which are simpler, lighter, faster, and in every way, just better than a triple. And with a gear range that’s wider, making climbing easier and descending faster, why would you ever go back to three? The all new Sram Apex enters the market at the right time with the perfect blend of; Tour de France winning innovations, Sram's proven performance and durability and the compact crankset is growing in popularity and understanding in the market. Sram again raises the bar of rear Mech performance with the new Exact Actuation Apex rear mech. The Apex rear dearailleur represents the same design philosophy that has delivered the best in class products for the road market. Features include new precise Exact Actuation ratio that offers the widest range of adjustment coupled with a precise geometry to create market leading 10 speed performance. The Sram Apex benefits from their newest and most advanced technologies, Zero- Loss technology simply means, no loss when you push on the lever, for an upshift or down shift, the cable is engaged instantly, meaning zero loss of movement. There is no middle-ground where you're waiting for the shift to come. Gear changes are instant and precise. Sram Apex Medium Cage Rear Derailleur Specifications Rear Mech Pro-Racing performance at a lighter weight than the competition Technology Exact Actuation WiFLi Technology Options 10spd rear Short 28T Cage Mid 32T Cage Weight 28T Short Cage - 200g 32T Mid Cage - 210g Finish / Materials Sleek, Jet Black gloss finish Alloy outer cage Steel inner cage Pulleys with bearings Features Lightweight system weight vs. triple Versatile - full range of gears "