Is Shimano ULTEGRA Di2 DUAL CONTROL LEVER 2X12s compatible with Shimano GRX Di2 REAR DERAILLEUR 1x12s?

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Not Compatible

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Issues found between Shimano ULTEGRA Di2 DUAL CONTROL LEVER 2X12s and Shimano GRX Di2 REAR DERAILLEUR 1x12s

Notes & Caveats

  • Front speed mismatch: ULTEGRA Di2 DUAL CONTROL LEVER 2X12s (2x) is not compatible with GRX Di2 REAR DERAILLEUR 1x12s (1x)
  • Front speed mismatch: GRX Di2 REAR DERAILLEUR 1x12s (1x) is not compatible with ULTEGRA Di2 DUAL CONTROL LEVER 2X12s (2x)

Part A

Shimano ULTEGRA Di2 DUAL CONTROL LEVER 2X12s

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Part B

Shimano GRX Di2 REAR DERAILLEUR 1x12s

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Frequently Asked Questions

Can I use Shimano ULTEGRA Di2 DUAL CONTROL LEVER 2X12s with Shimano GRX Di2 REAR DERAILLEUR 1x12s?

No — Shimano ULTEGRA Di2 DUAL CONTROL LEVER 2X12s and Shimano GRX Di2 REAR DERAILLEUR 1x12s are not compatible. Front speed mismatch: ULTEGRA Di2 DUAL CONTROL LEVER 2X12s (2x) is not compatible with GRX Di2 REAR DERAILLEUR 1x12s (1x) Front speed mismatch: GRX Di2 REAR DERAILLEUR 1x12s (1x) is not compatible with ULTEGRA Di2 DUAL CONTROL LEVER 2X12s (2x) Always confirm the exact specs before buying.

Do Shimano ULTEGRA Di2 DUAL CONTROL LEVER 2X12s and Shimano GRX Di2 REAR DERAILLEUR 1x12s 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 ULTEGRA Di2 DUAL CONTROL LEVER 2X12s and Shimano GRX Di2 REAR DERAILLEUR 1x12s 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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