The mt900 crank IS the xt crank as far as i'm aware. They released it because there were problems with the m9100 crank. then some months later the xt branded one came out.

 

How much play should a new xtr micro spline have without cassette installed?
I can pull/push freehub and it goes in and out a bit, feels like 1mm but probably less. No side-to-side play.
Normal or does indicate something like spacer is missing like talked about earlier?

 

Totally normal. On mine, with the wheel out there is a fair bit of play, once it's bolted up in the frame everything gets compressed leaving just a tiny bit of in/out play. If you read the service manuals they state this is to allow the freehub mechanism to fully disengage.

 

Thanks 109, just bought a rear to get started with a 12spd changeover and the shimano hub was not in the plan. It was too cheap to pass up, so now I'm reverse researching.

 

No problem! Glad you found the thread, the whole reason I started it was so people can see real life experience before buying. The price makes them almost impossible to beat. Sad that they creak... Be great if you could report back in a few months when you get some good miles on it.

 

So i took my slx hub bike on the trails today.
I definitely could hear some sort of noise under power up hills and accelerating. Hard to know if its from the hub, but if I was guessing, it sounds like the aluminium drive splines pressed firmly together and every so slightly shifting against each other as the load varies. low pitched "pop" sporadically under power. Not consistent with pedal strokes like most other creaks.

I probably wont ride it more than 1 or 2 more times off road this year, but ill keep an eye on it.

 

That sounds about right. Started off as some feeling off, then slowly got louder over a few rides once dirt gets in.

 

Ugh, starting to think that the deal that I got on a pair of 900 series hubs wasn't such a good deal.

Guess the question now is, do I build them up. Just ordered the spokes too.

 

Ugh, starting to think that the deal that I got on a pair of 900 series hubs wasn't such a good deal.

Guess the question now is, do I build them up. Just ordered the spokes too.

My LBS mechanic brought this to my attention last time I was in, shimano quietly released a standard 3 pawl rear hub. Looks to have the same flange dimensions(don't quote me on that). The front hub is bombproof, same thing that has been in production for 30+ years.

https://bike.shimano.com/en-EU/product/component/shimano/FH-MT510-B.html

 

Not too bad for a $57 cup and cone hub. What sort of wheelset are you looking to build up? I'm considering selling my wheelset I built up, xt 8100 hubs, dt xm481 30mm ID rims, dt comp race spokes, boost 29er. let me know if you are interested, have a brand new xt 10-51t cassette I'd include too.

 

The mt510 came out when slx/xt did. It's used on alot of bikes with slx. It's all steel, deore grade, which is why its very heavy and I expect the bearings to be deore grade - as in, fairly poor (compared to xtr anyway).

 

Just thought I'd share my positive experience with the MT900 series (non-XTR XTR) hubs.

I ordered these as soon as they were available in mid-2019. Built them to Ibis rims and using with XTR drivetrain.

I love these hubs so far. Maybe 800mi on them? They roll amazing well compared to my I9s and are basically silent. I don't even notice them. No play and engagement is great even after coming from I9.

I have yet to service them so I do not know the construction. These are very early release hubs so no idea what running changes might have been made to them. They have also not gotten very wet at all. Maybe a few rides in the rain and zero submersion in water.

Probably not much useful info, but figured I'd share my positive experience.

 

This is music to my ears. I have a set that I got for a pretty good price that I'm just waiting on the spokes to arrive for. Reading this thread has had me a bit worried that I shouldn't have invested the time/money/spoke lengths into them. But it's too late to turn back. Looking forward to getting these wheels built and this bike build done.

 

I think the m900 is the same hub as the xt, perhaps with better bearings.

Do you notice any sort of noise when climbing or pedaling hard? it may not be very loud and it doesn't sound like any normal bike creak.

I dont think theres anything wrong with mine (yet), I expect the noise is probably only noise, and wont develop into anything else, but we'll see.

 

Not sure it is the same except bearings. I think there is about a 40g difference in the rear between the MT900 vs XT. Probably some material differences. I doubt bearings can account for 40g in just the rear.

I have zero creaks/cracks/sounds even when mashing hard out of the saddle. of course, my riding here in VT is pretty steady as she goes. We don't have staircases or hop ups where you really mash on your rear end.

 

I'm pretty certain the MT901-B is the full XTR internals in the XT hubshell. (Both flanges of the MT901 are tall as opposed to the Hi/Lo of the XTR hubshell.) There is at least one procedure in the service manual that makes a distinction for the XTR M9100/MT901 vs the rest of the series.

On the trail, the MT901 had quite an unique sound when coasting at speed. Not loud, not annoying, but different than anything I had heard. Great engagement!

Can also attest that the MT901-B rolls faster than an I9 Torch

 

Can also attest that the MT901-B rolls faster than an I9 Torch

Sometimes it feels like I have zero friction. Really the best spinning hubs I have ever had, but I've only had Single, I9 and Easton in the last 10 years.

 

Pop goes the weasel. My xt rear microspline hub just binded up after 2 months. Worked fine then on the way home from a few hour ride the freehub locked up out of the blue, derailing the chain in the process. Fortunately it happened on a rolley strech of pavement, not a high speed section. I only had to carry the bike a mile or two before getting a ride the rest of the way home. The hub design is flawed, or the grade of parts are not up to the task. I took the hub apart and noticed that the plastic part, in the diagram "slider", had been chewed and spit out. Pieces of it went lodged in the axle/freehub preventing it from spinning. Other parts inside the hub may have failed as well.

 

I'd take it to LBS to do an analysis and let them get a warranty from Shimano.

 

Just purchased an XTR and SLX microspline version of these hubs. Couldn't pass up the good deal and will build up the XTR's next week.
I can take apart for inspection of parts in case anyone is interested in pics.
I may sell the SLX hubs as I don;t need backups for my backups....

 

Had the same problem with two Shimano XT M8100 hubs.
Got my Cube Stereo Hybrid in May 2020, after about 300km I could hear an increasingly loud noise coming from the hub.
I then got a new rear wheel from Cube with a new XT M8100 hub.
After about 50km the same problem again.
Two weeks ago I had the Shimano hub exchanged for a Newmen hub at my own expense.
Since then I have driven about 300km and no problems yet.

 

Nexusx1, wow that is some really fast failures! So far I seemed to be right about the 2 months of higher mileage riding before they have issues. I definitely classify that as a manufacturing defect, maybe an early batch for The OEM spec on the cube?

Because I wanted to sell off my 12spd wheelset(wanted to build up something lighter for XC riding, dt swiss xm481 rims are burly!) I gave shimano warranty a call and managed to get the tech in charge of my hub warranty on the phone. They've changed the material that the spacers/sliders are made of to a harder plastic, and now all hubs should be coming with greased splines from the factory to prevent creaking. He even took my wheel out for a couple test rides after reassembling to make sure there was no issues. Sounded like a good enough proccess for me to feel comfortable selling, I made sure to let the buyer know that I had issues freehub that shimano warranty had fixed in house.

 

Nexusx1, wow that is some really fast failures! So far I seemed to be right about the 2 months of higher mileage riding before they have issues. I definitely classify that as a manufacturing defect, maybe an early batch for The OEM spec on the cube?

The funny thing about the whole story is that the Newmen hubs are fitted as standard on the 2018 and 2019 Action Team models and the current delivery has also been installed with Newmen hub.
The Shimano XT hub was only used for the first deliveries in May because Newmen lacked to have the license for Microspline.

 

I will report back in a few months I guess, have starting riding this hub on a giant reign 29 so it'll get a bit of abuse.

Went for it's first proper ride yesterday and i really do like the silence when coasting, hopefully it doesn't eat it self up but knowing that the plastic spacer thing gets chewed up I can keep an eye on it.

 

I'm waiting for a random colour 28h hope pro 4 sale I guess...

My frame is non boost QR so i dont have too many options for economical wheels (this is my commuter i ride in the snow and slush, i dont intend to spend money on fancy wheels)

 

New XT hubs totally suck. 2 times failures !

Hi all, new to posting on the forum but have been reading product reviews on here for a while. I have had 2 of the new 12spd xt freehub mechanisms fail on me, and wanted to see if others have had the same experience. I built the hubs up to dt swiss xm481 rims with dt spokes as a solid set of trail/training wheels. I have had great success with shimano hubs in the past, so I saw no reason to spend more for a 350...

I'll start by saying the new design is completely different to the old system that has been around forever. Its similar to a dt, with 2 springs and separate freehub body that runs on cartidge bearings. The ratchet mechanism is self contained in the freehub body and is not user serviceable. the hub shell has cup and cone on either side. side note, the front hub is identical to the previous model.

The first failure happened within a couple weeks. I had the wheel off the bike, and it toppled over on the cassette side(hurts my soul to think about) and the cassette pulled the freehub out. At first I wasn't too concerned, thinking that they had finally copied dt swiss and made a tool free freehub. Then I realized that was not the case, as 2 small c-clips had popped out of place(one labeled DO NOT DISASSEMBLE) allowing the freehub mechanism to fall apart! I called shimano and explained what had happened. They were confused at how it fell apart, but walked me through how to reassemble it. After a few rides it started to creak like crazy(took me a couple weeks to figure out it was the hub), so I called shimano and they sent a whole new hub to my LBS under warranty.

I rebuilt the wheel with the new hub, and it worked flawlessly for 2 months. fast engagement, smooth bearings at a great price! really the goldilocks hub for 12spd IMO. Then it tried to lock on and turn into a fixie. I had just pedalled to the end of the driveway and started to coast up to a stop sign, when it made a god awful grinding sound that scared the sh*t out of me. I proceeded to lock the rear brake and slide to a stop. Upon taking it apart back at home, I found the toothed plastic spacer(think it is a tolerance thing) was completely chewed up. I think part of it must have gotten jammed in the ratchet mechanism. The two cartidge bearings in the freebody were also totally shot. I put every back together without the spacer, and while the freehub didn't lock on anymore, the horrible creaking was back.

Currently waiting on another warranty replacement, shimano maybe sending out an xtr hub. hopefully it doesn't break too.

Hi, I just suscribed to this forum to answer your question :

YES > the XT hubs are weak piece of ****.

They where initially designed to be 100% the new SYLENCE thing, but few months before shipping the first batch, they realized after testing that they would have issue.
They modified something (invert 1 spring) in order to improve the engagement, but whatever it is, there is an engineering flaw.

My hub has failed 2 times.

At the beginning, they look good. At a certain speed, they unlock and roll silent, but if you push them up hill (high load climbing) they will very soon start to make cracking sounds...

At the beginning, I thought that my lacing was wrong, or the spokes where the cause of cracking sounds, but after inspection, some plastic part were chew-up in the hub. They did developed play and had to be sent back to shimano.

I did purchased a new one, waiting for Shimano to repair the defectuous one, but the new one start to get the same symptoms...

The rest of the groupset is fine (all new XTR) I went for XT hubs based on the reliability of the previous model. Big mistake... I should have spent more for some DT 240.

 

YES > the XT hubs are weak piece of ****.

^^^^ Doesn't know the difference between a freehub and a hub.

 

Good luck...

If you don't load them, they may last... But if you climb those long road/trail with slopes of more than 30 degrees, be ready to cling-klank **** (and failure coming after)

 

new XT hub faulty

I forgot to write that the free hub started to catch up and lock the chain, nearly crashed 3 times ! Costing down hill, the chain suddenly fall !

I managed to went back home by breaking and pedaling all the way done, in order to keep the chain under tension.

Shimano must stop selling this specific hub DEORE XT M8100. They are dangerous !

 

Are people seeing issue with XTR or the MT901? I have not heard if any yet


Sent from my iPhone using Tapatalk

 

Are people seeing issue with XTR or the MT901? I have not heard if any yet

Sent from my iPhone using Tapatalk

I recently built a set of MT-901B hubs so I'll let you know if no one else chimes in about them. I've been waiting on some parts due to supply chain issues to get the bike they are going on rolling, but think I should be good to go later this week.

 

How many hours of riding are you guys doing before seeing these failures? I've just done about 10 hours worth so opened up the hub to have a look. Couldn't see any issues or wear on the toothed spacer thing.

I do hear what I think you're all referring to as this popping sound when climbing, it's always been doing it though, not as though it's been silent and then suddenly it starts.

 

I got around 150 hrs of ride time out of the second hub before it started creaking, so probably check the spacer every 50hrs or so. I never had popping sounds, just slowly started intermittently creaking, then tried to lock on.

 

Something is different about the M9100 XTR and MT-901 hubs vs. the M8100 and below.

The Shimano owners manual has different instructions for the M9100/MT-901. One specific section talks about spacers that are used to set (what I assume to be) lateral freehub/axle preload.

Also, just learned today that the M5100 Deore hubs have cartridge bearings and standard pawl freehubs... interesting

 

new XT hubs are defective > FH-M8110-B

They will work for 2 or 3 rides, but if you load them, they will start to get side-to-side play, make creaking sounds and fail.

If you bring them to the tech, they will try to tight it back, it will work for a while, they chewing party...

Think about it, what kind of (free) hub design would randomly "be silent" or engaging with clicking at speed? Rubbish design. Or let's say "incomplete".

The worse is, they did send to reviewers all around the world the "Scylence rear hub", of course, it was working time of the review trial. But in between, labs sent "Alarm warning!" they have to hold their shipment and under commercial pressure, they quickly try a solution to the problem by "cancelling" the Scylence" but the structure remained the same. Impossible to redesign and manufacture the whole design !

Too many tiny parts, weak construction/material, and commercial pressure to launch the product.

btw > I am talking about that specific model FH-M8110-B. I like Shimano products, but this time, they failed.

Now, if you like to rebuild a rear hub every 3 months, it's another "hobby" than mountain-biking.

 

My failed xt hub worked great no creaking etc, then out of the blue it locked up. Dangerouse. I did notice it had gone silent all the time a few days before it failed. I have a warranty replacement ready to be laced up, shimano is quick with the warranty, hopefully they sent out a hub with the updated harder slider. Wonder if certain serial number correspond to the updated part?

 

The updated slider was a smooth, white plastic, vs the porous black plastic of the original. I think the best thing to do would be to pull the hub apart and reassemble it to the specifications of the document shimano sent me(post #30). So many small parts, I could easily see something going wrong during factory assembly. A little too much force and the slider will be bent from the get go.

Youtube also recommended me this, in Portuguese but seems this shop was having so many problems with these hubs creaking on the cube bikes they sold that they made a video for their customers. turn on auto translate to get a decent idea of what's going on, pretty much word for word the updated service doc I received from shimano.

And for those wondering what the creaking sounds like: