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2

This relates to the lack of 'full groupsets' fitted to nearly every MTB sold today. The spec of your bike is largely 'Deore XT M780', but you have an 'XTR M980' rear derailleur. This is something seen on many many new bikes - a higher spec RD and lower spec elsewhere The first and most important thing to note here is that XTR M980, XT M773, SLX M6663, and ...


4

A common observation is that Shimano sets conservative limits to capacities of its derailleur products. Many people, including myself, run bigger than allowed cassettes with no problems. Additionally, there are aftermarket adapters available that are designed to help exceed the nominal capacity of certain road and MTB derailleurs. Is that a common thing ...


0

I been using a Shimano Alivio M4000 RD paired to a 11-46T cassette for almost 3 years now and I didn't Have the issue that was being pointed here. Alivio m4000 has max 45T so just used hanger extension it works great. But going to 11-50 I don't think the Alivio RD can handle that. I don't know about the 2021 edition of the Alivio perhaps you can try that if ...


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I am using m951 with 11-40t cassette, works flawlessly. I am really happy with it. Might even work with 11-42t, but I didn't try.


2

With the clutch engagement switch in the "off" position, the derailleur cage should move smoothly with the only resistance being from the cage spring. All indications are that your derailleur has failed (there's a good chance this is what caused your chain to break) and needs to be repaired or replaced. Pre-COVID, replacements for 10-speed XT RDs ...


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