Shimano XT M8100 Rear Derailleur Fitting Guide

Nice and detailed tutorial. Did you know that this mech can be used in 11sp setup?
I am currently using it in that setup and works very good

Great Video Thanks

You really have a head of asshole!!
Did your dad hit you when you were a kid?

Good no nonsense video as I've come to expect. I pretty much followed the routine in here before watching the video but wanted to check I wasn't being an idiot, as I could tell from the moment installing the RD-M8100 SGS derailleur on the hanger, it was never going to work on my bike as is.

It wouldn't even reach the largest cog without touching the body of the derailleur before the stop low stop. So after some googling on some other MTB forums and looking at your video, I was surprised to find out these require a traditional mount hanger. Not direct mount. The detail is not very clear in a lot of online shopping websites and even shimano's own spec table does not really make it totally clear. I couldn't get the largest cog and the position of the derailleur looked all wrong. At one stage I was thinking of getting a longer B screw but eventually realised that wasn't going to fix it. And the lack of larges cog was due to the different offset on the direct mount hanger.!!

It is quite a catch out if you are upgrading from 11Speed XT M8000 as well. I was scratching my head for a few hours yesterday thinking what is wrong. I had forgotten about direct mount versus traditional mount. Quite a few questions in these comments asking exactly the same and unanswered so thought I would post this. Thanks for the videos.

Dear folks! That's ALL you should know when installing any Shimano rear derailleur. Flawless. Nuffsaid

Best derailleur video out there thank you!

Hey!
Is there any "universal hanger". I had m8000 derailleur and thought it was just plug and play procedure.
Sadly, it's not!

I have watched that many derailleur tuning videos that I have lost count and this one without a doubt is the best. Your in-depth explanation of the process is absolutely fantastic. It is such a good idea to tune the derailleur without the chain on.

God i wish i found your channel sooner. You explain things sooooo well

Thanks!

3 stars

Thanks

Thanks. Super helpful!

Thank you, it was great help since I don't have access to a mechanic nearby.

This channel is much too underrated! Love this guy and his straightforward presentation.

Well explained straight to the point well videod !! Top guy no messing about

Do these derailleurs fit on regular mounts or do they require funky direct mount?

Tks, 👍

Excellent and thanks for simple no nonsense or BS guide, any guidance on direct mount challenges would be helpful as I’m having a mare setting mine so think the hanger is a problem!

Cheers Mate🤟🏻

Amazing video ! Very detailed! Well done !

Index it with clutch on or off ?

great video thanks . can you fit mine for me please ?

Great video…thanks

it is compatible with XT sprockets. 10-45T and 10-51T

Great video! Thank you!

Excellent cheers

Can you tell me what the ‘bumper’ does? Mine fell off randomly today, and worried it’ll fall off again.

The gears feel gritty through the pedals in the middle of the cassette, any suggestions?

Do you need to adjust the barrel up at the shifter before doing all of this ??

love the way you show and explain step by step. thanx

Great video! I basically just followed right along and got my new derailleur installed easy peasy. Cheers!

Very helpful, thank you

Excellent tutorial

Thanks VERY much, this is a really clear and well articulated guide. Appreciate it!

When I have no cable in my rear xt deore derailer it springs out to the largest sprocket. Why is this on the smallest with no cable????

Best one I’ve seen, thanks a lot! 👌🏻👏🏻🙌🏻

Hi ..Great video , Many Thanks
Can I ask what frame is in the video ?

Great video, thanks for sharing your knowledge.

how many links on the chain did you use? did you cut it or not?

Used your video last night to set up my upgraded 12sp shimano drivetrain. Easy to follow and understand, thanks so much for posting this. Now all i need is a few months, less snow and dry trails and ill be good to go! Greetings from Canada!

Thank you sir! This is by far the most informative video on how to properly adjust this set.

Searched through loads of videos before i found this one on setting up a rear mech, The clearest by a long way, Thank you.

Great tutorial! Thanks!

Thanks Very clear

great video again! thnx a lot .

Hey, surprised you didn't mention the b screw guide mark behind the top pulley to adjust b screw... 🤔

great job on this fitting series for the 8100 groupset. I will be installing 6100 soon so this is very helpful insight.

Great video!!! Awesome. Thank you very much for the help!!!