Shimano 12 speed Micro Spline Overhaul. This is a stock SLX hub.

[@mongolacken5412]

Thank you for a very good video! 🙏 It helped me a lot getting rid of the annoying creaking sound. Just needed greasing as I was bone dry. One thing: if you by any chance pull the free hub apart it’s pretty easy putting it together as long as the parts are not damaged. (For some reason one free hub flang was damaged so the cassette was stuck. I had to pull it with force which in turn pulled the free hub apart)

[@diejeekoen]

Thanks for this Vid. My Backwheel fell apart at the actual freewheel when I it was build out and eventually fell over on the Freewhee side. The Cassete with the microspline hub and a part of the freewheel and two secure rings had come loose. I didn,t know where to start to build it together again. This video helped. The real freewheel ratchet as you hold at 2:33 had come apart. One part was still in the hub, the other part in the Microspline part. It is normally hold together by 2 compressable metal rings you can actually see at 2.33. When you losen them you can take a look in the actual ratchetfreewheel. I can tell you, it is lubricated! With thin oil. When you will lubircate it with to thick lubrication like grease it will probably not grip again when pedaling. My rearwheel had also had a creek, I supppose it will be gone now.

[@BikeTeacher]

Nice insight. The viscosity of the grease as you mention can make a difference, good catch. Thanks for your comment.

[@liwx]

the best bike mechanics channel on youtube !

[@BikeTeacher]

Thank you. 🏁⚙️

[@TheGotauno]

Shimano recommends replacing the yellow spacer for a black one. The yellow one was made of a weak material. All hubs made from November 2019 already have new black spacer.

[@BikeTeacher]

Good to know. Thanks

[@jacquesdahlet7207]

Where do you get that black spacer? 2 XT hubs and I found all the teeth of that yellow spacers broken. On both hubs

[@pabloc106]

Good to know, i bought mine today

[@officialgsingh]

@@pabloc106 where did you get the spacers? Any paet number?

[@pabloc106]

@@officialgsingh no, i bought the hub! Not the spacer, my bad. And i opened it and came back with the yellow one…

[@jltrack]

Wow that’s complicated! No wonder people are having reliability issues with the new freehub bodies.

[@BikeTeacher]

I would love to learn more about this hub. I haven’t seen one like this before.

[@saifulredzuan5236]

I believe to mordulate the spring spressure is via the left hand hub nut to either lengthen or shorten the length of hub....correct me if im wrong thanks anyway this video is very helpful to understand more as this technology isn't like the normal claw system which is pretty much straight forward

[@johnstandish7055]

Thanks for this video, guys! Mine is the XT hub. After a year or so it started making a "grinding" noise under pressure after riding uphill for awhile. I brought it to a dealer for service and they determined one of the inner plastic parts was broken. (Perhaps the yellow spacer mentioned below. No replacement part available, of course.) The dealer I bought the hub from replaced it with a new one thanks to Shimano's 2-year warranty. Of course, that also meant de-lacing and re-building the wheel, which is NOT covered. Now, after about 5 months with the new XT hub, it's starting to make the same grinding noise. My local dealer tightened the hub (which helped) but I suspect more problems down the road. It looks from this video that taking it apart and greasing is the way to go, but OMG! Though I do a fair amount of DIY service on my bike, I'd be REALLY hesitant to try this myself for fear of misaligning one part or another (or nearly forgetting one as happened in the video).

[@BikeTeacher]

I think your almost there. Sounds like you are up to the challenge. My DT Swiss microspline are doing great. Completely different design though. That person who I did the work on says so far so good to this day. I hope Shimano rectified it. Thanks

[@johnstandish7055]

@@BikeTeacher Since I'm on my SECOND Shimano XT hub-which started making the same grinding noises as the first within a couple months-I may well be up for replacing the freehub body with the DT Swiss one. My big question, though, is: Can I replace the Shimano freehub body with the DT Swiss one without replacing the entire hub, which would mean de-lacing and re-lacing the wheel, a task that is definitely above my pay grade?

[@ikharl328]

Would u buy microspline wheelset again?

[@dlt1]

@@johnstandish7055 Hi, did you find an answer to your big question? I'm considering the same thing but also can't find one. If you bought the DT Swiss free hub: How is the engagement and sound? I personally don't like the sound of my xt hub, engagement with 108 teeth is great though.

[@johnstandish7055]

@@dlt1 I did NOT get a DT Swiss freehub. Still on the Shimano XT. I don't imagine the DT Swiss hub would fit inside the XT housing, since their inner workings are almost certainly different. I agree the grinding noise that the XT starts making if you don't regularly take it apart to grease it is annoying. My 2nd one is still functioning, at least, and my local dealer seems to be happy to replace it if it goes bad within its 2-year warranty. Only bad thing about that is having to de-lace and re-lace the wheel, which is way beyond my pay grade. Guess we'll see!

[@johnpaulestiamba358]

What if you remove the yellow plastic what will happen?

[@h20s8804]

Good vid. I have a non-series XTR rear hub that makes a peculiar creaky noise in low gear climbing. I'll take it apart and see what it looks like. I'll say, DT is wayyyyy simpler than all this bizness... I'm not sure how all this is gonna last :)

[@BikeTeacher]

DT Swiss is so simple, I love it. In low climbing gear, there could be multiple areas the sound could be coming from. That’s a tricky one. Some odd items could be spokes, quick release cassette.

[@h20s8804]

I built the wheel. Thru axle. It's the hub for sure. There is also some play in the free hub body. You can grab the cassette by the largest cog and 'wonk' it back and forth. This is a new-er hub. @@BikeTeacher

[@1st2nd24]

I have this hub, at high speeds It's dead silent but has no engagement problems

[@BikeTeacher]

What year is yours. I wonder if they changed internal materials.

[@MtbEnduroChile]

Thanks for this video! I hate mi hub XD!

[@BikeTeacher]

Your welcome!

[@edgarantonio4282]

I just saw the video where he destroys his hub, XD greetings German

[@juancamilochavezcastano3288]

Jajajaja buenísimo Germán

[@MetalTiger88]

Took apart a few of these. Absolute disaster every time. Some of them are suddenly start making loud noises. I had customers who thought they are loosing their motor🤣

[@BikeTeacher]

I haven’t ran into anymore since. My DT Swiss microspline is still running well.

[@anitakoerdt1895]

great video of an incredibly poor product ;-) - thanks Shimano

[@mvbmech]

Thank you very much for the video, I was really looking for one to better understand Shimano's new hub , how to handle it more correctly. It would have been better if you would have made the video without the background noise of a working engine or a lawn mower that takes the concentration out and destroys the explanation

[@BikeTeacher]

Sorry, and thanks for the feedback. I will review my video.

[@johnstandish7055]

@@BikeTeacher I wouldn't take that comment TOO much to heart. I'm a professional audio mixer by trade, and yeah, there were some persistent background noises, but your dialog was plenty clear enough to allow me to stay focused on what you guys were saying, and anyone who had trouble focusing because of background noise probably should NOT try doing this procedure at home! ;-)

[@aaivilchip]

What do you think about cheaper FH-MT401 microspline Freehub? I'm looking for reliable QR135 microspline Freehub. Based on Shimano exploded view, it's less complicated than it's higher siblings, gud ol' pawl-rachet rather than star-rachet with tooth yellow shim

[@BikeTeacher]

That actually looks great. Keeping it simply lime DT Swiss. I wonder if the hub teeth are replaceable?

[@14TacomaDR]

I was told by my bike shop I need a new free hub in my 2021 Specialized Trubo Levo Comp. Which is on back order until August ! Would this be covered by warranty.?

[@BikeTeacher]

I believe it should be. Either by specialized or Shimano. Does the shop have any info? You can call Shimano directly. There may be recalls.

[@atenconsult1437]

Thanks for this video!

[@JAS_Arcilla]

is there freehub body,pawls and bearing available for slx hub?

[@BikeTeacher]

I am not sure. I have not had to service this one since that day. You may call Shimano directly. Sorry I don’t have they number handy.

[@petrofcikmatus]

Hi guys, is it possible to change bearings in the freehub body? Mine SLX makes squeaky noises when I'm pedaling and I found out that the most right bearing is not good anymore, so I guess it tilts.

[@luizhenriquepereira1394]

Is there replacement parts: tothed plastic ring and springs?

[@rodriguezahr]

Just serviced this hub at a bike shop but sadly the hub is making a rubbing noise if I pedal backwards while wheel spinning

[@abdulmesbah8219]

I have the same issue and can’t find out.

[@rodriguezahr]

@@abdulmesbah8219 the bike shop damaged my hub. I had to by a new one, this time a DT-Swiss 240. What a difference. 😻

[@afivestars4617]

Hi every one, can I put the free hub of M8110 to replace on SLX M7110?

[@alexboo3512]

Some say that if you drop some motor oil into the "do not lubricate" area, the hub will became almost silent. I'd like to try it. Who tried this?

[@sprousaTM]

Nice tutorial.. I have a FH-M8110-B XT hub with the microspline freehub. I have been noticing a rattling sound when going over rough stuff. After inspecting I found out that the cassette can be moved with the freehub body really slightly in axial direction. I pulled of the cassette and the freehub body itself can be moved slighty. What could be the cause of that? It seems that on the freehub itself you cannot make any adjustments, right? I will pull the hub of and try to see whats wrong... When going fast and not pedaling the sound of the freehub stops when reaching a certain speed...

[@pabloc106]

The movement that you mention in the casette can be a problem in the body itself, if thats the case shimano should replace the body or the entire hub. And for the noise is normal and is mean to be like that, at certain speed of spin the body doesn’t make any noise

1:45 any ideas what should i do if it doesn't come off? I tried pulling as hard as i can, even put the cassette back on so i have more things to grab on, but nothing

[@BikeTeacher]

Hmm, if it looks exactly like mine, it probably just stuck. The first metal seal with rubber (encapsulated) could be stuck stopping the body from being removed. Is yours exactly the same as mine? And the end cap is removed?

​@@BikeTeacher yes, as far as i can tell, it's the exact same model. I removed both the end cap and the seal with the metal spring. It was a bit dusty, but nothing serious. Last time it was disassembled about a year ago, the bike was in a service, so i don't know how they put it together. Since then i wasn't riding much in dirty conditions, not at all in mud, so i didn't bother taking it apart. (shameful, i know)

[@BikeTeacher]

@ Are you performing regular maintenance or is there a significant problem? That’s a head scratcher, if stuck there may be a part that failed and is now jammed inside. You may need to get rough with it and jarr it loose. Keep in mind this may damage something further. You can also speak with Shimano directly.

​@@BikeTeacher I'd call it just maintenance, but it started creaking a little a few days ago, so there might be a problem too. I'll ask about it in the local service, but one idea that came to my mind is putting the cassette back on, and giving it a few small hits from the non-drive side, with something i can put through the spokes symmetrically. Not too ideal to add impact on the thread, but certainly better than nothing. And yes, there's the official support. Thank you very much for your help, you're amazing!

​@@BikeTeacher hmm, my comment got lost, rewriting it so i'm sorry if you get doubles So, i took it to a local bike shop, they couldn't get it off either. But got a great idea to pull the whole axle out, so that way i can reach the freehub mechanism. It worked, but of course the freehub is still stuck on the axle. Problem not solved just avoided. One thing that shocked me though, was that the little plastic spacer (Y3G111000) is almost fully worn out, barely any teeth left on it. What do you think, what's the purpose of that spacer? Once i heard it's just for noise reduction, but does it have a more important function? I mean, could i ride without it for a while, or would i risk damaging the hub? (i haven't find any spare ones in webshops, but there's a free 3d model available if you search for it (maybe the link made my previous comment disappear), i sent it to a 3d printing service. It could be a good solution if you or one of your viewers face the same problems)

[@joaobarbosa5757]

Thanks for the video! I have one of this new Shimano hubs and after clean the bike a few times with a strong degreaser it starts a strange noise, apparently due to lose the grease on that plastic piece(spacer). Do you know if that spacer can be removed? What is the function of that? Thanks.

[@BikeTeacher]

I am not sure. I would be afraid to remove it.

[@JB-qz2zy]

All the little plastic legs of mine broke... I'll keep you updated if it causes hub failure.

[@suhardiwidjaja3611]

After i disamble this kind of freehub for cleaning and i install it. I feel the free hub free wheel is so tight. Had i wrong step to install it or anything was mistake?

[@BikeTeacher]

It’s possible something got put back wrong. Sometimes a rubber seal creates drag. But usually not a major concern.

[@suhardiwidjaja3611]

@@BikeTeacher Thx for reply. I will check again.

[@solarheat9016]

It should go for 10 years like the old design did.

[@BikeTeacher]

Yes or longer.

[@TrailsnGravel]

My freehub has developed a lateral play along the axle path.. The cassette moves about 1/2mm.. Can this be fixed or am I looking at a warranty claim?

[@BikeTeacher]

Could just be a simple hub adjustment. I would do that first then proceed to test.

[@TrailsnGravel]

How to the hub adjustment?

[@om3981]

Do you know if I can replace silent 9100 free wheel in the xt 8100 hub?

[@BikeTeacher]

I am not sure. you may call the manufacturer directly. They are usually helpful if yo call them as a customer or a shop.

[@christiancerda4328]

Can you put an xd driver on the hub or does it have to be microspline?

[@BikeTeacher]

Depends on the hub. I believe you may put either brand, as long as the hub is compatible.

[@TheLargeRed]

I am probably having the same issue. For a while, the hub has been really quiet and a few days back, I would hear some ratcheting sound and it would stop and now I’m hearing some clicking noise too and the ratcheting sound is pretty intermittent. Have you guys figured out a way to fix it? Helpful vid though. Thanks.

[@ottonelson6950]

same here

[@oskar4934]

I have even more complex problem with this hub.. The racheting sound is present till I pass 12km/h, after it is makes any noise at all.

[@chadsugden411]

Oskar same here man. Low speed it clicks but High speed the noise goes away

[@sprousaTM]

@@chadsugden411 oh and I thought mine is broken. It makes noise like a wasp and when going faster it completely goes away or comes back sometimes. Sounds pretty stupid when not consistent on or off...

[@chadsugden411]

sprousaTM yeah mine did it from brand new. I pulled it a apart and wiped off all the grease and gave it a milieu lighter grease job and seems good now. Time will tell it it gets sticky again in a ride or 2

[@Chrislenomadcorsicariders2a]

the inner plastic parts was broken , where buy this parts ?

[@BikeTeacher]

I would check with Shimano. Call them directly.

[@BikeTeacher]

Or check your the shop it was bought from. May be a warranty.

[@Chrislenomadcorsicariders2a]

@@BikeTeacher shimano france ma envoyer la pièce directement et gratuitement ! bravo .

[@emausderratsuchende5447]

I've been riding Shimano Hups for 30 years and I've noticed that the structure has been changed completely unnecessarily, for tough MTB use it's no longer as resilient, durable and easy to maintain as in the past, the development is very annoying....

[@BikeTeacher]

Yes, I agree. The DT Swiss micro spline is much simpler and works great.

[@giladjudes3906]

Can the microspline core be replaced with a HG-M core ?

[@BikeTeacher]

I’m not sure. I would check with that manufacturer for details.

[@galenkehler]

That is surprisingly complicated for shimano

[@dachshundaddiction8604]

i currently using shimano m8100 after many sevicing my dust cover i destroy it already.is it ok without dust cover because im just riding pure urban no trail.

[@BikeTeacher]

It will function just fine. You won’t hurt anything. It acts as a protectant against dust.

[@dachshundaddiction8604]

thanks for the answer

[@artzukii]

My SLX m7100 freehub doesn't make any sound. Should i be worried?

[@BikeTeacher]

I don’t think any of them were intended to be silent unless stated. It could be a sign that it may disengage at some point and stop working. I would definitely look into it sooner than later.

[@t020336]

It was actually planned to be sold as a silent hub, but when it was not 100% silent. Shimano removed ”silent” from the commercials.

[@buddlersen]

I got the same little problem: the freehub is nearly silent but engages properly. The big problem is the freehub drags the chain on lower gears on my ebike. Cleaning, relubing/ regreasing (tested bearing lube and thin oil) does not improve it. Any idea?

[@chadsugden411]

Did you guys fix this?

[@aromaj8]

Just for everyone watching this video, I do believe the intermittent noise is a feature, not a bug! The ratchet system works similar to the Chris King drive rings, except that Shimano’s can pull the ratchets almost completely apart, making for the intermittent sounds. If you watch the video, the two outer mechanisms that appear first in disassembly are what apply force to the ratchets, and the actual ratchet plates are inside that. Hope this helps anyone!

[@diejeekoen]

Yeah and actually it is greased with oil

[@josha1903]

Can you change the driver body to hg?

[@BikeTeacher]

I don’t think so. It may not be friendly like other hubs, like non 12 speed systems.

[@trailfork7815]

valuewise I would have loved ti get me some shimano xt's but after hearing them getting plagued with issues and seeing how complicated the system is, I'm really turned off

[@BikeTeacher]

I have DT Swiss 240 on my XC bike, so far soo good. No complaints to date. Thanks

[@DiegoP.Escouto]

🔝🇧🇷🇧🇷

[@Chromedome-ss6mg]

Why the hell do they make it so overengeneered. Dam

[@BikeTeacher]

It does seem that way. Especially compared to brands like DT Swiss. I hope they redesign it.

[@JL-od4wg]

How many engagement ?

[@BikeTeacher]

I don’t know. I couldn’t get a clear answer from. Check this ,

[@BikeTeacher]

The new Micro Spline freehub allows for a ten-tooth cog and the XT version provides a lightning fast (for Shimano) ten-degree engagement. Maximum gearing range from its 10 x 51-tooth spread is 510 percent and its shift levers can click off two gears in each direction with one push.

[@markanthony9256]

Whay will happen if you dismantle the part that has "do not disassemble?"

[@icesystem7]

but why?

[@BikeTeacher]

Exactly.

[@JAS_Arcilla]

what spoke do you use???

[@BikeTeacher]

I am not sure what you are referencing by spoke?

[@MultiAddorable]

My slx hub don't sound

[@Eric.V.]

Great vid! NO THANK YOU Shimano.

[@BikeTeacher]

Lol, Thanks for watching!

[@VikingRasbornStrong]

OMG.... WHAT! great video and instruction... thank you. but this is WAY MORE overly complicated to self service or even upgrade any poe compared to my SRAM XD and BONTRAGER RAPIDRIVE which now has 6 Paul's and 108 poe for tricky climbing..... Never going to touch this ever. Unbelievable. Over engineered and totally designed to bring to bike shop and pay a mechanic! WHY? My 2cc since I actually enjoy working on my bike.

[@BikeTeacher]

I hope Shimano reconsiders this design to a simpler one.

[@zepp3lin]

No such issues with i9 micro spline hub.

[@BikeTeacher]

Nice, my DT Swiss is doing fine still.

[@Thecrazyvaclav]

Let's make it complicated, because we can, wonder how long those thin plastic teeth will last in the real world of mud, grit and water

[@BikeTeacher]

We will find out. I have the XT, not sure if it has the same ingredients, but I will wait to open it until needed.

[@adamputu5448]

Looks Little Bit Difficult

[@BikeTeacher]

Yes, I would take pictures on this one and definitely take your time.

[@thebdceigal]

Just because something is designed in Japan doesn't mean its good quality,. My hub is bunked after just a few hundred kms of riding. Won't be buying Shimano anymore.

[@BikeTeacher]

Your right. Sorry that happened.

[@normanmommu1]

A really stupid, complicated, overengineered solution.

[@jrclad2964]

TOO COMPLICATED, better DT Swiss: less parts, less hasle.

[@BikeTeacher]

I agree.

[@adamputu5448]

DT Swiss? That You Mean HG?

[@jrclad2964]

@@adamputu5448 ..the ratchet part; easier to take apart, clean and put back on.

[@koltiride3769]

This hub is sucks very slow

[@BikeTeacher]

You have the SLX? I have the DT Swiss on my xc bike. It’s doing well.