SRAM's CenterLine XR rotor is the road-specific version of the CenterLine family — same quiet braking track, but with a two-piece construction that swaps a full-steel body for a steel brake track riveted to an aluminum carrier. That saves rotating weight where it matters and gives the rotor two different materials to manage heat, which helps under the sustained braking loads you see on long descents. If you're building or refreshing a SRAM eTap AXS road or gravel setup, this is the rotor SRAM designed to go with it.

It comes in 140mm and 160mm diameters, with both 6-bolt and Center Lock mounting options — so there's a version that fits whatever hub standard you're running. Most drop-bar bikes will run 140mm rear and 160mm front, though a lot of gravel builds go 160/160 for a bit more stopping power and heat capacity when you're loaded up. Rotor thickness is 1.85mm, which is the standard SRAM road spec and works with all current SRAM road hydraulic calipers and pad compounds.

The rounded edges are worth calling out. Beyond meeting UCI safety requirements for mass-start road racing, they make wheel changes noticeably easier — no sharp corners to catch on pads or bags when you're pulling a wheel in and out. The CenterLine braking track itself is designed around vent placement that reduces the harmonic resonance that causes rotor squeal, which is a real quality-of-life difference over cheaper rotors that howl in the wet.... Read More