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Thanks!
I am not keen to keep it 1x8 but just in case, would that cassette work?
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.de%2Fulk%2Fitm%2F183767593162If i switch to 1x10, i could keep the RD but replace the shifter by a 10x, so that my current RD would work with the 10x shifter, correct?
e54-
Yep, it can work. I've even seen someone using an RD-M550 LX (1990-ish) derailleur on a 10 speed setup, and he claimed it was fine. :)
^^^^^ which M56x crankset is that? M560 is 110 BCD, while M563 and M567 are 94 mm. It might be hard to find a proper narrow wide chainring for the latter.
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Just be wary that 10 speed shimano MTB stuff has a different pull ratio than the 8&9 speed stuff. So a 10 speed 'DynaSIS' shifter (Deore, SLX, XT, XTR Etc.) won't work with an 8 or 9 speed RD.
If you want to use your original 8 speed parts with a 10 speed cluster, you'll need to use a 10 speed 'road' flat bar shifter - available widely.I'll drop a link to a Youtube video that is boring as hell but explains it all well...
vpCogworks
smac
8 speed derailleur works fine with 10 speed as well, but same does not apply to shifter. If you want to keep your current 8x system, Shimano makes 8 speed cassettes in 11-34 range and then there is even this 11-40 cassette by never heard brand ZTTO , but I reckon the jumps are not that nice.