Designed for everything (un)possible. Polished aluminium crank arms in various lengths and the DUB bottom bracket system ensure that the Rival crank always turns, no matter what. A close and even 13-tooth difference between the chainrings ensures precise and reliable shifting. DUB technologyThe crankshaft and bottom bracket assembly is at the heart of DUB technology. This is where stiffness meets durability. SRAM has gone a step further and made everything even simpler and better. It is the system approach through the integration of chainring, crank, shaft and bottom bracket that means better drivetrain performance. X-RangeRoad bikes are faster and more capable than ever before, and riders are expanding what’s possible with drop bar bikes. X-Range is gearing for today’s road riding. SRAM completely reimagined road gearing for wider range, more useful and smoother gear progression, as well as smarter shift settings—enabled by AXS. With X-Range, you’re always in the right gear.