SHIMANO Dura-Ace, Ultegra, GRX: 1 B-Axle in TITANIUM - 43% lighter - only by us!

Shimano Dura-Ace, Ultegra, GRX: 1 B-Axle in Titanium for Derailleur. - Shimano GRX Di2 RD-RX817. - Shimano GRX Di2 RD-RX815. - Shimano GRX RD-RX812. - Shimano GRX RD-RX810. - Shimano Ultegra Di2 RD-R8050-SS/GS.

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