Why Run the Shimano Dura-Ace RT-CL900 140mm on Your Road Bike?

The Shimano Dura-Ace RT-CL900 140mm carries the same three-technology stack as the 160mm flagship: ICE TECHNOLOGIES FREEZA (three-layer stainless-aluminum-stainless sandwich with extended radiator fin), the Dura-Ace-exclusive 3D Aluminum carrier engineered to resist heat deformation and prevent rotor runout noise, and heat dissipation paint for additional thermal performance. The 140mm size is the most common rear rotor choice for road disc setups running a split-size configuration, pairing it with a 160mm front for a slight weight reduction and reduced rotating mass at the rear wheel where braking demand is lower. Some road builds also run 140mm front and rear for maximum weight savings on flat terrain.

The CENTER LOCK spline mount provides fast, precise installation with no bolt alignment. Compatible with Dura-Ace R9200 and R9100 series hydraulic disc brake calipers and broadly cross-compatible with other Shimano road and gravel hydraulic disc systems on center lock hubs. The RT-CL900 at any size is the only road disc rotor with the 3D Aluminum carrier, giving it a deformation resistance advantage over the RT-CL800 on demanding descents. For Dura-Ace riders who want the best Shimano rotor in the rear position, this is it.