It took much longer than anticipated for Shimano to come out with a 12-speed mountain bike drivetrain, and even when they did release the details of the new XTR M9100 group it was still nearly a year before all of the components could actually be purchased. That meant there was a three-year span between the debut of SRAM's Eagle 12-speed gruppo and Shimano's entry into the ring, enough time that even diehard Shimano fans began to jump ship in search of more shifter clicks and wider range cassettes.
Thankfully, it looks like the amount of time between announcement and availability should be much shorter with the upcoming
XT and SLX groups, and, if all goes to plan, by the end of this summer riders will have a range of price points to choose from.
But let's focus on the XTR M9100 group for now, Shimano's flagship off-road drivetrain.
XTR M9100 Details• 12-speed, 10-45 or 10-51 tooth cassette (tested)
• Multi-release shifter
• Direct mount chainring
• Hyperglide+ cassette and chain technology
• Requires MicroSpline freehub body
•
www.bike.shimano.com DetailsAt this point, the details of the XTR M9100 drivetrain have been discussed in extensive detail multiple times, including a
First Look article and an
First Impressions article. But if you missed those, here's the quick rundown.
Cassette / Chain: The 10-51 tooth cassette is the heart of the drivetrain, with three aluminum cogs, five titanium cogs, and then four steel cogs to finish things off. The cassette and the hollow pin chain are shaped specifically to allow shifting to be performed at any time, even under load. The gear steps are: 10, 12, 14, 16, 18, 21, 24, 28, 33, 39, 45, 51. There's also a 10-45 tooth cassette for riders who don't need such a wide range and would rather have closer spacing between each shift. The cassette requires a MicroSpline driver body, which has 23 rectangular splines that allow for the use of a multi-part cassette with a 10 tooth cog. The cassette weighs in at 376 grams.
Shifter: According to Shimano, the M9100 shifter requires 35-percent less effort to activate, and shifting is 20-percent quicker. Both up- and downshift levers are textured to avoid thumb slippage, and it's possible to shift down two gears with one single push. Weight: 127 grams.
Derailleur: The derailleur uses 13-tooth jockey wheels and retains the adjustable clutch mechanism found on Shimano's prior derailleurs. Weight: 242 grams.
Cranks / Chainring: You may have noticed that the cranks shown in the title image look a little different - that's because they're the M900 cranks, which have an XTR direct mount chainring mounted to the new XT cranks. Production models of top-tier XTR M9100 cranks only recently became available; those cranks are still aluminum, but forgo the familiar two-bolt crankarm mounting interface, and are approximately 80 grams lighter than the 595 gram cranks (with ring) tested here.
InstallationEvery time I install a 1x drivetrain, I take a moment to pause and appreciate the fact that front derailleurs have almost completely disappeared from the mountain bike world. I spent way, way too many hours wrestling with those finicky things during my years as a mechanic, and the fact that many bikes don't even have a spot to mount one makes me happy. Yes, there is an XTR M9100 front derailleur, but I'm just going to look the other way and pretend I didn't see it.
With no front derailleur to fuss with, it's the rear derailleur adjustment that's the key step in the installation process. Shimano takes the win here vs. SRAM – they've thoughtfully printed a mark on the backside of the outer pulley cage that makes it incredibly simple to set the correct amount of B-tension, without the need for a separate plastic tool.
The cassette installation is simple, but don't forget to install the small, almost clear spacer that comes with the cassette. It's an easy thing to overlook or misplace, but it's designed to help prevent any unwanted creaking.
PerformanceWhen's the last time you really thought about when and where you shift during a ride? For most of us, shifting has become second nature – we're accustomed to shifting into an easier gear before a big hill in order to avoid shifting while pushing hard on the pedals, or, if that's not possible, unweighting the pedals slightly during a shift to prevent the chain and cassette from emanating any clunks and clanks of displeasure. Shimano's Hyperglide+ design makes that unweighting and pre-planning unnecessary – you can now shift whenever you want, and the chain will move up or down the cassette without any fuss.
I was skeptical at first, and all the years of practicing proper shifting technique made it hard to trust that bad things wouldn't happen when I decided to shift during the middle of an extra-steep climb. My fears were unfounded, though, and the chain went exactly where I wanted it to each and every time.
Want to quickly shift into an easier gear while you're pedaling hard out of a corner? Go for it. How about shifting into a harder gear in the middle of a sprint towards a hard-to-clear jump? Yep, that'll work too. For me, this is the most impressive feature of the entire drivetrain.
The only downside is that when I would hop on a SRAM-equipped bike I occasionally found myself shifting as if I was still on XTR, which caused a few clunky gear changes and some not-so-nice noises. I also missed the ability to drop down two gears with one push when I switched to a SRAM drivetrain It's a little thing, but with SRAM a double click is required, while with Shimano it's one single push.
As far as the actual shifter ergonomics and feel go, the XTR shifter requires a little more effort to push compared to a SRAM X01 shifter, but it is very distinct and precise, and shifts feel like they happen the very instant the lever is depressed.
I'm also a fan of the traction pad on the shift lever, a feature that came on several wet and slimy winter rides. That pad can be replaced but based on the limited amount of wear that's visible so far, I have a feeling that won't be a very common occurrence.
Cassette Spacing It wasn't too surprising when Shimano announced that their cassette had a 51-tooth cog. There's probably some science behind it, but I've got a feeling having a wider range, no matter how small, than SRAM's 10-50 tooth Eagle cassette was always the goal. I didn't notice any massive difference between riding with a 50-tooth gear and a 51-tooth gear – they're both easy enough to provide some welcome respite on super-steep climbs.
With the XTR cassette, it's only a 6-tooth jump to get to that 51-tooth cog, versus the 8-tooth jump on an Eagle cassette. That spacing difference is noticeable, and it makes it easier to maintain a similar cadence after making that shift.
Durability The entire drivetrain has survived the wide range of conditions I've subjected it to, and the amount of wear that's visible is in line with what I'd expect. The fact that the derailleur's clutch is adjustable and rebuildable is another point in Shimano's favor vs. SRAM. The non-series cranks are developing the usual rub marks; it's a little more noticeable on the black cranks compared to the actual XTR cranks, but either way, it's going to happen, especially if you ride in wet, gritty conditions.
Does It Blend? There have been a number of questions floating around in the comments section about the cross-compatibility of SRAM and Shimano components. Of course, neither company is going to recommend mixing and matching their components with a direct competitor's, but does that mean it doesn't actually work? Not exactly... It turns out that the cassette spacing and cable pull amount are close enough that mixing brands is entirely possible.
Not surprisingly, if you want the best shifting performance from an XTR drivetrain, it's best to use all of the components - chain, derailleur, cassette and shifter. The chain and cassette are specifically designed to work together, and if you use a different chain you aren't getting all of the benefits of the impressive Hyperglide+ shifting.
That being said, it's also possible to pair a Shimano XTR shifter and derailleur with a SRAM Eagle cassette and chain. You'll lose the ability to power through the gears under load, but you'll still be able to drop two gears with one push of the shifter, and have a serviceable and adjustable clutch, all without needing to buy a Microspline freehub body or an entirely new hub / wheel.
The Weight GameFor all the gram counters out there, here's a handy chart that illustrates how XTR stacks up against SRAM's X01 drivetrain. Yes, SRAM's XX1 drivetrain will be a smidge lighter, but that's group is aimed more at XC racers and riders, while X01 and XTR have a broader range of intended usage. The biggest difference in weight comes down to the cranks and is due to SRAM's use of carbon vs. Shimano's aluminum. The actual XTR cranks (I tested the non-series cranks, which are technically XT cranks with an XTR chainring) will be lighter, but still not as light as SRAM. Shimano does take the win for the derailleur weight, coming in at 242 grams vs. 281 grams for an X01 derailleur, but that gain is partially erased by the slightly heavier cassette and shifter. At the end of the day, both groups are quite light, especially considering how much abuse they can withstand.
Pros
+ Incredible shifting performance, especially under load.
+ Excellent shifter design, feel.
Cons
- Gram counters will likely want lighter cranks.
- MicroSpline driver body isn't widely available yet.
Pinkbike's Take | It took a lot longer than anyone anticipated, but the wait for Shimano's 12-speed drivetrain was worth it. The ability to shift at any time, combined with the excellent lever feel and well-thought-out gear spacing all uphold XTR's spot as the flagship gruppo in Shimano's off-road lineup. It does cost (and weigh) a little more than SRAM's X01 Eagle group, but the performance more than makes up for that.— Mike Kazimer |
What is up with those colored key words beneath the articles on the main page?
Looks horrible, clutters the page and doesn't really help with knowing the content of the articles.
You can find equivalent extensions for other browsers.
Kill it with fire, theres no reason to color-code your filter tags, noone will ever remember "oh, the yellow one means Drivetrain". Your font sizes are getting all over the place too, why are these all bold? can we also discuss the 1px gray stroke...
Seriously, for a site worth upwards of 32million, may want to hire a more experienced design/dev team.
Too busy riding bikes in Squamish I guess...
I also experience bugs and crashes on a regular basis. For example, with my last comment I submitted it, and scrolled down to see it posted twice (I did not double click the submit button), and when I refreshed the page the comment showed only once. So something as simple as making an ajax request and creating a div for my comment on the page on completion was something pinkbike got wrong. Stuff like this also happens on Trailforks for me.
I do professional software development, and have contributed to enterprise mapping applications in the past so I know this stuff is tough, but I figured the world's largest action sport website could handle it.
Oh - and no emoji support. Whyyy
Suggestion: make it gray, less poppy, less vibrant. They are just screaming for attention
Love pinkbike!
*NEW HAIBIKE E-BIKE REVIEW*
"I feel deceived, I clicked on the article and it is actually about e-bikes"
"They are screaming for attention".....
That is PB, its content, its users and its comments sections all right there, so those little coloured tags look right at home.
Very ouch.
Truth hurts sometimes.. equally guilty here!
Before Eagle, no one would have excepted a slipping drive train.
Sram releases exactly that and everyone goes gaga over it.
The two largest cogs are wide-narrow profile.
Just think of putting your chain on a W-N chain ring, you have to sync the chain to the teeth- same thing happens with an eagle cassette, sometimes when you shift onto those cogs, the chain rides on top of the teeth because it's out of sync and has to slip a tooth until it's in sync.
forums.mtbr.com/drivetrain-shifters-derailleurs-cranks/sram-eagle-design-flaw-1052658.html
Its simply impossible that every shift of yours to one of those two cogs is in sync. That would be like you telling me you can flip a coin and have it land on the same side every time.
People can neg prop me all you want doesn't change facts.
I have so many customers on Eagle drivetrains, and so few having issues. I'm glad shimano has caught up, and hopefully the real competition is going to push Sram into making their drivetrains better, but the constant "eagle is shit!" rhetoric is so bloody old. You have to be essentially blind to not see Eagle has been insanely successful.
It's not about issues, its design.
Not one post has disputed the fact that the shifts can never be 100% in sync. The system is designed to have to slip.
Please prove me wrong.
90% of our floor bikes are sram. To say it hasn't been a successful group is a joke. It changed the market.
I'm merely pointing out that while it took time, Shimano spent time engineering a drive train that can shift under load. You don't have to be a Shimano fan boy to respect the fact that took more time then slapping on an extra cog and making the lowest two WN with subpar shifting.
I just find it funny how everyone is ok dismissing that little fact while piling on Shimano for taking so long.
@TheOriginalTwoTone: As Tgent also said, once properly tuned, it's very rare to happen. You told me I thought N/W cassette cogs were a good idea, or implied it, I'm merely responding to that notion.
Anyway glad to have cleared this up for you and remember to change your chain at least once every 6 months even if it looks fine because eagle cassettes and chainrings aren’t cheap.
Lets educate you on the issue. A chain has wide and narrow links. A wide narrow chain ring or cog has wide and narrow teeth. Following so far? Good. Now in order to work properly, the wide link of the chain has to be on the wide tooth of the ring/cog. Why you may be asking, because the wide tooth can't fit into the narrow link.
So when a chain is out of sync with the ring/cog it rides on top because it can't physical mesh- it's impossible.
Hope that helps.
youtu.be/kem5Rk863WA
Funnest part of this whole thing is you're getting positive props.
I guess a lot more people don't understand how a chain and W-N tooth profile works.
Here, maybe you're better with pictures:
www.pinkbike.com/photo/17397438
A narrow link can never fit on a wide tooth. New chain old chain, doesn't matter.
That has nothing to do with chain stretch so why mention that?
I posted the video so you could see in slow motion how it works. I didn’t notice the chain sitting on top of any of the sprockets. Did you?
That is the slip we're talking about here. Not worn out drive trains that you stumbled into this conversation talking about. Two completely different subjects.
From this article it sounds like to me the new xtr is as good or better which is great and might end up in my next bike. your words? Just fanboi bs.
You're some kind of special. Go out and try it on your chain ring. Move the chain one link either direction tell me how well that meshes.
This guy is genuinely trying to help you and you've repeated the same irrelevant point some 6 times to this point. Please stop and be reasonable with the people trying to help you.
It's really that simple.
You don't want to stop and pay attention. The 'slip' I'm talking about is when the chain rides up on the wide narrow cogs. Simple to reproduce on a chain ring as well.
Again this slip I'm talking specifically about has nothing to do with a worn out drive train. It ONLY happens on two cogs that are wide narrow on a 12 speed Eagle cassette.
Why is this so hard to comprehend?
Stop with your nonsense and get a life. Sounds to me like you’re a crappy mechanic more than anything.
I love the way all of you ignore a very simple question.
Can the narrow part of a chain fit on the wide tooth? Nothing to do with wear.
Answer that simple question.
"I don't think the narrow wide cog is a great idea, nor do I recall saying that. The system can slip while shifting into the easiest cog. This is such a small problem for most people that most still absolutely adore the system."
My only point was @thenotoriousmic: came into the conversation about the slip you and I were discussing and starting into chain stretch etc... which is not what we were talking about and then proceeded to tell me I don't know what I'm talking about.
@thenotoriousmic - no way. No pinch bolts, no care
@WAKIdesigns: Got a link of the bike? Could always check out some rad rides. Kinda miss that 10 speed glory days kinda stuff.
Then I’ve seen the latest XTR in person yesterday and at least to me, looks as bad as Sram hahah. The rear mech is just Deore-ish. The 11sp was hideous enough but the only “cheap” looking thing was the plastic clutch lever. But the latest 9000 looks like Deore to put it mildly. The 10sp 980 series will stay in my memories as the best made MTB group ever, challenged only by 9sp X0.
I'm sure Shimano did design the new spline to resolve the issue as you described while intentionally adding another proprietary piece to the puzzle.
Cynically, the increase number of gears and narrower chain mean that everything needs to be replaced more often :-(
A 7/8speed 10-46 cassette would be plentyfull for everything while beeing way less painful to adjust.
Please- the SRAM E Bike group is obnoxious expensive.
Can't wait to buy XTR and dump the Eagle load...
Sunrace csm 680 8speed cassette almost gets you there, 11-40 but enough for 90% of ascents
And you can't forget to switch on a Sram clutch.
If you aren't using the chain and cassette you don't get the benefits of the new group
Amen, riding 10and11speed sram and shimano and srams only advantage is weight. Rest goes to shimano
I have XT 11sp on my bike, I rented an Eagle bike and was constantly searching for that second detent.
Today I run a SRAM XO cassette (11-42), Shimano XT derailleur, XTR shifter, KMC chain, and Wolftooth ring. The XO cassette is nice and light and ridiculously durable (being made out of steel; it's on it's 4th season now). For me, this is the best feeling system I've ever had. While I didn't mind the XO shifter and derailleur that came with the bike, I'm not a fan of that positive "clunk" in shifting, I prefer the silky smoothness of Shimano. But this is purely a preference thing, I totally get that some people find Shimano shifting vague.
They went more than one direction with this stuff!
Everything is well made and works as advertised.
So Shimano, please hurry up and allow other manufacturers (specifically Chris King) to produce the new freehub.
Preferably before my current 11 speed cassette wears out.
If not, I’m going e-13 9-46 with my current XT/Xtr 11 speed kit.
That should get me through 2021...
Thanks in advance
I agree that it would be better to have more choice though.
Check the link above. Bulldog is on the new XTR brakes, which are, essentially, a brand-new lever design on Saint calipers.
Not relevant for everyone, but since I run my levers very close to the bars, changes in bite point is massively annoying.
I am on the new XTR's now but it's been only about 20km worth of DH runs. The brakes are absolutely amazing but I do hope the bite point holds for the rest of the year.
And those Saint calipers now run on my do it all hardtail with leftover Slate T4 levers which is good enough, if anything it tamed down the bite. Testament to how much shimano brakes are bombproof as I never reconditioned those calipers.
I had some 2017 Code and while they were giving ok power I absolutely hated the way pads were way too close every time you put fresh pads int, even after removing some fluid in the lever.
No noises on mine though, and I've tried them out on both rain and dust (note I've only done about 10 DH runs so far and maybe 15kms worth of trails). Are you using the Freeza rotors, by any chance? I'm using floating rotors.
Also the lever has the fluid chamber and isn't just a lever, so it will indeed always make quite some difference.
Currently losing my mind because after 50 miles on my new bike with a GX eagle cassette I have the exact same clicking noise as the XTR had. I knew I was risking it because these GX cassettes are also held together with pins..but, I thought no way it happens again and with SRAM. I haven't fully started investigating but I'm not hopefull.
2. One pic appears to show a matchmaker clamp thingy that mounts the XTR shifter to a Sram brake lever. That is a part I am interested in purchasing. What is it?
Great product, used it for about a year before switching to Formula brakes.
www.mtb-news.de/forum/t/shimano-xtr-12-fach-eagle-kassette-schon-jemand-damit-unterwegs.878491
What is it that you prefer about this method over the tool?
And when you say look at it from the side, is the non drive side the best view?
If I wanted the best drivetrain the Shimano has a slight advantage. What is the durabuility of the micro spline free wheel?
If your going to build the ultimate bike you will probably go for custom wheels and a carbon crank.
Was there something wrong with the four bolt chain rings? Are the direct mount chainrings compatible with other cranks?
PS. I have AXS and honestly preferred Eagle but am too lazy to swap back. It's close enough. And yes the lack of cable really is nice.
And will there be a 11s HG+ cassette? Any infos yet?
(couldn't find this on the previous comments...)
My XTR cassette has always creaked. it can be temporarily appeased by slapping lots of grease round the freehub splines. needs to be repeated every few wet rides or the creak comes back. however i have not noticed anything that looks like an 'almost clear spacer'? am i missing a spacer i wonder? have checked the exploded view of the cassette and all of the spacers seem to be there?
si.shimano.com/pdfs/ev/EV-CS-M9100-4376B.pdf
none are available from Shimano till September. i am going to try and make my own out of helicopter tape.
Maybe 3rd time lucky....
Not sure I am keen on silent hubs, makes it easier to steal the bike.
1. Journalists (who don’t pay for this stuff)
2. Seasoned shop employees (buying it at the price of standard XTR/XX1),
3. Folks owning 500sqm apartments/lodges in Whistler or Aspen (so that’s pennies for them anyways)
...and a few lost souls who convinced themselves these are worth 5 months of their salary after paying bills and food.
Plus I'm just packing up my bikes and gear for 3 weeks in the Alps. So yeah, my life is pretty sweet at the moment.
Clearly your missing his point! Have fun in France.
Next year, when a 12sp di2 will be release, it's going to be fun !
I'm 44 years old and have run Shimano and SRAM extensively over the past 25 years. IMO it's a little ridiculous to get so bent out of shape on what is better. I've never been extremely unhappy with any drivetrain I've run except for an Eagle NX group which just felt cheap and doubled the weight of my bike. Even Eagle GX had been okay aside from the mech getting a bit sloppy after a year.
That being said, I'd freaking love to see a 9sp or 10sp 9-46 or 10-46 setup. The weight, lack of durability, cost, etc. of 12sp is jsut not needed.
But look at a di2 equipped bike from tour de France, do you see any cables? No you don't, so if you want to hide the outer-cables on a di2 mtb you can.
AXS works as cable-actuated drivetrain, nothing more nothing less. Di2 or Campy EPS on the other hand rely on proper fly-by-wire to improve shifting in any conditions on a given chain/cassette/chainring. Di2 shifts faster and better. Why? Because components talk to each other few times during 1 sec. Something you can't do with a wireless drivetrain as of now with the AXS or the old eTap. Why? Wireless drains too much battery.
There is a reason if the pro on the road don't want to use the AXS from Sram. I don't give a d*mn about the name of the better solution. As of now the HG+ from Shimano annihilates both Sram Eagle and Eagle AXS.
Look at the price of a rear AXS mech. I'm sorry but it's quite expensive, and even worse, Sram had the brilliant idea to put the brain of the AXS inside the rear mech, making it even more expensive than the old etap. The di2 'brain' is in its battery, well protected as it should be.
I banter about drivetrains because I know and have used them all because of my job. Like it or not, in terms of shifting performance the 12sp from Shimano is killing it with it's HG+. Having one less cable … what a big deal!
BTW, none of this matters...
Personally I prefer the shifting of the XTR, but I love the AXS more. Its f*cking cool and makes me feel a little bit better about the rest of my shitty shitty life.
@WAKIdesigns standup comedians almost exclusively perform on stage and most of what they do is in the delivery. There are plenty that have positive routines (Milton Jones, Michael McIntyre, Micky Flanagan)... Its all about their outlook on life.
Why would anyone get offended from this? Would someone please explain.
If it does it will be as unsuccessful in mtb as the current gen Di2.
There’s a reason why mtb Di2 never took off, despite how hard Shimano pushed it. They even tried with XT with basically no result.
Meanwhile AXS, even with the price, has been much in demand. Just wait till it trickles down, which it will.
Wireless shifting will be ubiquitous in a few years once the tech trickles down. Given the choice, if price isn’t a thing, would you really prefer a cable system over a wireless one?
Plus I'm really not sure why we're talking about road systems. It's completely irrelevant here. Seems to me Nino Schurter is doing ok with his AXS set up.
I said that because Sram went wireless, they couldn't do what Shimano or Campagnolo do. Every di2 or eps components talk to each other at least 10 times per second. Why? Because it doesn't drain power down as much with a fly-by-wire. And it gives the di2 or the eps a clear advantage in terms of shifting performance. Only FSA has a wireless drivetrain with a shifting performance on par with di2. Why because they have a way bigger battery than what Sram has.
25 to 40hrs well that's nice … What about every 3 to 6 months?
Nino Schurter had issues with the AXS and he HAS to use it.
If I can misjudge a tech climb and shift gears while climbing without skipping or horrible noises coming from my cassette Shimano wins.
If Shimano were to add hg+ to their m8000 m9000 lines they would put sram on the ropes.
I'll take the 11spd cassette that is only 30grams more then my current xx1 10-42.
Sounds great only I can't give them my money because I am on Chris King hubs.
25 hours is plenty. Charging is easy. Wires are stupid.
Road is irrelevant to this discussion. You'll get hit by a car before frequency of communications matter.
Nino absolutely does not have to use it. No way he or his sponsors would sacrifice wins with inadequate equipment.
It sad people have to latch on to purchases like it's life or death.
Now that we can mix SLX, XT and XTR it's cheaper to go HG+. Being able to mis-match is cool don't get me wrong, but that's not the way to go with 12sp.
Yes axs drains more battery and that's an issue. I'd rather use di2 because of that.
It otherwise works just like di2. Both systems communicate in a few milliseconds, not a second.
However, it would have been helpful to include the cost of the new FH in this piece (but perhaps the cost is unknown.)
This review is nothing new. It’s the same thing everyone else has been saying. It’s almost like it is strategically released PR to remind people that XTR still exists and that it shifts great (which is 100% true) because it is foundering in the marketplace and not coming close to the expectations that Shimano’s arrogant and out of touch management has for it. Add in that hardly anyone bought those “priority packs” of XT and SLX that they flew over from Japan and they might be waking up.
Shimano is lucky that the OEM’s expect us to spend 5 grand on a bike with garbage NX Eagle - that’s going to be their opening to get back some OEM share of they don’t mess it up.
Well as a workshop manager I've fitted it to a few too... including my own. get it out of your stand and onto the trail and the shifter works just fine. Sounds like the way you position you levers could be making it awkward too, so it could be worth reworking your personal setup preferences.
"As a Workshop mechanic" lol
Well as a Shop Manager, I have been recommend Shmeagle, best of both worlds, and you dont have to change out your wheels for Microspline. TBH the freehub is the big issue here, not you mounting the shifter to marshal down an aircraft down.