Shimano has dropped the long-awaited 1x GRX Di2 option to complement last year’s 2x Di2 option. Now I know you’re probably thinking “that looks just like XT!” and you’d be correct!

Lideen looks to be using a new Shimano GRX rear derailleur, a 12-speed-specific 1x chainring, and a 12-speed Shimano XTR mountain bike cassette, here in a 10-45t configuration.

Shimano RD-RX815 (Di2) and RD-RX810 rear derailleurs (short cage) can be used with Shimano Ultegra, 105 or Tiagra 11-30/34 cassettes, while RD-RX817 (Di2) and RD-RX812 rear derailleurs (long cage ...