Shimano Dura Ace RT-CL900 - 140mm | Center Lock

Shimano Dura Ace RT-CL900 - 140mm | Center Lock Shimano

Shimano Dura Ace RT-CL900 - 140mm | Center Lock

Shimano Dura Ace RT-CL900 - 140mm | Center Lock

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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.

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Specifications

  • Model: RT-CL900
  • Series: Shimano Dura-Ace
  • Size: 140mm
  • Mount: Center Lock
  • Construction: ICE TECHNOLOGIES FREEZA with 3D Aluminum carrier and heat dissipation paint
  • Compatible Systems: Dura-Ace R9200, R9100 and compatible Shimano hydraulic disc brakes on center lock hubs

FAQ

Is 140mm enough for road disc braking, or should I go 160mm?

For rear use, 140mm is the standard choice on road disc setups and is sufficient for the vast majority of road riding. The front caliper does the heavy braking work. Many riders run 160mm front and 140mm rear for a slight weight savings. Running 140mm front and rear is also common on flat-to-rolling terrain.

What pads are recommended for the RT-CL900?

The RT-CL900 works with all standard Shimano road disc brake pad compounds. The K05S-RX resin pad is the current OEM choice for most road disc setups. The L05A-RF adds a radiator fin for additional heat management on longer descents.

Can I run the RT-CL900 140mm with Ultegra or 105 Di2 disc calipers?

Yes. Shimano disc rotors are cross-compatible across caliper tiers. The RT-CL900 140mm works with Ultegra R8100, 105 R7100 Di2, GRX, and other Shimano road and gravel hydraulic disc systems on center lock hubs.

Best For

Dura-Ace disc brake riders on center lock hubs using the RT-CL900 as a rear rotor in a split 160/140mm setup, or building a weight-optimized 140mm front and rear configuration for flat to rolling road terrain.

Shimano Dura Ace RT-CL900 - 140mm | Center Lock Reviews:

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