The Apex rear dearailleur represents the same design philosophy that has delivered our best in class products for the road market. Features include our new precise Exact Actuation ratio that offers the widest range of adjustment coupled with a precise geometry to create market leading 10 speed performance. New SRAM&174; Apex is the perfect blend of technology & performance, so all riders can challenge their personal limits. SRAM&174; Apex has double chainrings, which are simpler, lighter, faster, & in every way, just better than a triple. & with a gear range thats wider, making climbing easier & descending faster, why would you ever go back to three?