SRAM RIVAL E1 170x48/35 DM DUB NoBB BLACK (P)Careful engineering has resulted in crankarms that optimize stiffness to weight ratio, with material only where its needed Integrated chainrings deliver flawless shifting in ranges that fit your needs, with the whole package coming in over 50 grams lighter than the previous generation X Range gearing technology gives you more range and a smoother gear progression, so youre always in the right gear DUB bottom bracket adds durability and simplicity 48