Senior Member
Join Date: May 2009
Location: Brazil, Londrina PR
Posts: 273
Bikes: Kona Unit, Kona Kahuna, Kona Dew DL, Scott Big Jon, Trek Checkpoint ALR4, KHS Urban Soul, Haro Team Issue, GT Force Expert Carbon, Bernardi Quadra.
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One thing I'm not sure yet and cannot figure out anywhere. Will I be able to use the Shimano RD-RX812 rear derailleur with a 2x drivetrain. I'd love to have a 46-30 or 48-31 double crankset with an 11-42 cassete.
From reading shimano's not very intuitive website it seems like the RD-RX812 is for 1x applications with a 42t max cog and the RD-RX810 is for 2x applications with a 34t max cog.