Shimano Tiagra R4000 Compatibility: Does It Work Seamlessly with CUES?
Shimano Tiagra R4000 compatibility is unusual, offering pairing with CUES shifters but incompatibility with the derailleurs and cassettes.
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cues
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Ultra-Wide Range 2× Drivetrains for Drop Bars: GRX & CUES Compatibility & Hacks
With new Shimano components and clearer CUES compatibility, we now have 2× setups with wider ranges and lower gears than ever before.