Thread: GRX vs. Ultegra
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Old 09-01-19, 08:14 AM
  #27  
wsteve464
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Originally Posted by bonsai171
Looks like the min low sprocket is 40t (not 36t).

https://bike.shimano.com/en-NZ/produ.../RD-RX812.html

Back to the drawing board.
I believe you can use an MTB Di2 rear derailleur with GRX components and it goes up to 42 teeth on the rear with no problem.
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