Is Shimano GRX BRAKE LEVER 1X11s RX810 compatible with Shimano ULTEGRA REAR DERAILLEUR MEDIUM CAGE 11s?

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Not Compatible

high confidence

Issues found between Shimano GRX BRAKE LEVER 1X11s RX810 and Shimano ULTEGRA REAR DERAILLEUR MEDIUM CAGE 11s

Notes & Caveats

  • Front speed mismatch: GRX BRAKE LEVER 1X11s RX810 (1x) is not compatible with ULTEGRA REAR DERAILLEUR MEDIUM CAGE 11s (2x)
  • Front speed mismatch: ULTEGRA REAR DERAILLEUR MEDIUM CAGE 11s (2x) is not compatible with GRX BRAKE LEVER 1X11s RX810 (1x)

Part A

Shimano GRX BRAKE LEVER 1X11s RX810

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Part B

Shimano ULTEGRA REAR DERAILLEUR MEDIUM CAGE 11s

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Frequently Asked Questions

Can I use Shimano GRX BRAKE LEVER 1X11s RX810 with Shimano ULTEGRA REAR DERAILLEUR MEDIUM CAGE 11s?

No — Shimano GRX BRAKE LEVER 1X11s RX810 and Shimano ULTEGRA REAR DERAILLEUR MEDIUM CAGE 11s are not compatible. Front speed mismatch: GRX BRAKE LEVER 1X11s RX810 (1x) is not compatible with ULTEGRA REAR DERAILLEUR MEDIUM CAGE 11s (2x) Front speed mismatch: ULTEGRA REAR DERAILLEUR MEDIUM CAGE 11s (2x) is not compatible with GRX BRAKE LEVER 1X11s RX810 (1x) Always confirm the exact specs before buying.

Do Shimano GRX BRAKE LEVER 1X11s RX810 and Shimano ULTEGRA REAR DERAILLEUR MEDIUM CAGE 11s use the same number of speeds?

Yes, both are 11-speed components. Matching the speed count is the single most important drivetrain requirement — the cassette spacing and cable pull are designed around it.

Are Shimano GRX BRAKE LEVER 1X11s RX810 and Shimano ULTEGRA REAR DERAILLEUR MEDIUM CAGE 11s the same shifting type?

Yes, both are mechanical (cable-actuated). The cable pull ratio must still match between brands and generations for precise shifting.

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