Is Shimano GRX BRAKE LEVER (FOR Di2) compatible with Shimano ULTEGRA Di2 REAR DERAILLEUR 2X12s?

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Not Compatible

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Issues found between Shimano GRX BRAKE LEVER (FOR Di2) and Shimano ULTEGRA Di2 REAR DERAILLEUR 2X12s

Notes & Caveats

  • Electronic shifting family mismatch: GRX BRAKE LEVER (FOR Di2) (shimano di2 grx 12) is not compatible with ULTEGRA Di2 REAR DERAILLEUR 2X12s (shimano di2 road 12)
  • Electronic shifting family mismatch: ULTEGRA Di2 REAR DERAILLEUR 2X12s (shimano di2 road 12) is not compatible with GRX BRAKE LEVER (FOR Di2) (shimano di2 grx 12)

Part A

Shimano GRX BRAKE LEVER (FOR Di2)

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Part B

Shimano ULTEGRA Di2 REAR DERAILLEUR 2X12s

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Frequently Asked Questions

Can I use Shimano GRX BRAKE LEVER (FOR Di2) with Shimano ULTEGRA Di2 REAR DERAILLEUR 2X12s?

No — Shimano GRX BRAKE LEVER (FOR Di2) and Shimano ULTEGRA Di2 REAR DERAILLEUR 2X12s are not compatible. Electronic shifting family mismatch: GRX BRAKE LEVER (FOR Di2) (shimano di2 grx 12) is not compatible with ULTEGRA Di2 REAR DERAILLEUR 2X12s (shimano di2 road 12) Electronic shifting family mismatch: ULTEGRA Di2 REAR DERAILLEUR 2X12s (shimano di2 road 12) is not compatible with GRX BRAKE LEVER (FOR Di2) (shimano di2 grx 12) Always confirm the exact specs before buying.

Do Shimano GRX BRAKE LEVER (FOR Di2) and Shimano ULTEGRA Di2 REAR DERAILLEUR 2X12s use the same number of speeds?

Yes, both are 12-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 (FOR Di2) and Shimano ULTEGRA Di2 REAR DERAILLEUR 2X12s the same shifting type?

Yes, both are electronic. Note that electronic groups still have to belong to the same electronic family (e.g. Di2 vs AXS) to communicate.

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