Is Shimano GRX BRAKE LEVER 1X12s compatible with Shimano 105 REAR DERAILLEUR 12s?

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Not Compatible

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Issues found between Shimano GRX BRAKE LEVER 1X12s and Shimano 105 REAR DERAILLEUR 12s

Notes & Caveats

  • Front speed mismatch: GRX BRAKE LEVER 1X12s (1x) is not compatible with 105 REAR DERAILLEUR 12s (2x)
  • Front speed mismatch: 105 REAR DERAILLEUR 12s (2x) is not compatible with GRX BRAKE LEVER 1X12s (1x)

Part A

Shimano GRX BRAKE LEVER 1X12s

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Part B

Shimano 105 REAR DERAILLEUR 12s

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Frequently Asked Questions

Can I use Shimano GRX BRAKE LEVER 1X12s with Shimano 105 REAR DERAILLEUR 12s?

No — Shimano GRX BRAKE LEVER 1X12s and Shimano 105 REAR DERAILLEUR 12s are not compatible. Front speed mismatch: GRX BRAKE LEVER 1X12s (1x) is not compatible with 105 REAR DERAILLEUR 12s (2x) Front speed mismatch: 105 REAR DERAILLEUR 12s (2x) is not compatible with GRX BRAKE LEVER 1X12s (1x) Always confirm the exact specs before buying.

Do Shimano GRX BRAKE LEVER 1X12s and Shimano 105 REAR DERAILLEUR 12s 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 1X12s and Shimano 105 REAR DERAILLEUR 12s 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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