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Po
swmlon
Not sure, if I had to hazard a guess it would be a medium cage, which can handle up to 46t which is what I had set up with the SunRace 11-46. I eyeballed with the tape measure at it's about 9cm from from the centre to centre of the pulley wheels. If @edscoble can search his memory banks he might know as I had bought this off him when I got the Arkose.