New Shimano XTR 12-speed: What you need to know

Race-ready drivetrain boasts 510% gear range, plus options galore

Components News
New Shimano XTR

The new 10-51 cassette delivers a whopping 510% gear range. Take that SRAM.

It’s no secret. In the last couple years, Shimano has been taking a beating in the mountain bike drivetrain wars — especially at the high end. Just look at the current North American component spec on top tier XC and enduro race bikes from the big three. Giant’s Anthem Advanced Pro 29 0 (XC) and Reign Advanced 0 (enduro) both come stock with SRAM Eagle XX1 drivetrains and SRAM brakes. Same goes for Trek’s Fuel 9.9 Race Shop Limited, Procaliber 9.9 SL Race Shop Limited, and Fuel EX 9.9 29. And just one Specialized halo race bike (Epic XTR Di2) has Shimano parts. All the other upper level Epic, Enduro, and Stumpjumper builds are draped in SRAM components.

So why this glaring disparity? Two words: 12 speed. Indeed, until today Shimano hasn’t had a product to directly compete with the wildly popular 12-speed SRAM Eagle drivetrain, which has all but put an end to front derailleur equipped bikes, at least in the U.S. market. But that will most certainly change in 2019 — and we don’t mean the return of 2x systems.

New Shimano XTR

The new 12-speed Shimano XTR group has arrived.

Behold Shimano XTR M9100, the Japanese giant’s first foray into the 12-speed world. There is a ton is information to get to here, so start scrolling.

Cassette Goes to 51

The primary new cassette (there are three total) has a 10-51 spread, which equals a 510% gear range or 2% more than SRAM Eagle’s 10-50. The other two new Shimano options are a 10-45 Rhythm Step, which has a 450% range, gentler gear steps, and slightly lower weight, and a 10-45 11-speed cassette, which offers lower weight (310 grams versus 367 grams for the standard 12-speed), but still works on company’s new 12-speed platform.

New Shimano XTR

There are three XTR cassette options, including the standard 10-51 12spd and a lighter 11spd option that will work with the new system.

Using the 11-speed cassette also means fewer total chain links needed (about 6), meaning more shaved weight (about 13 grams), reduced chain slap, better chain retention, and increased ground clearance because you can use the new short cage rear derailleur (more on that later). The 11-speed cassette also plays nice with Shimano’s new wide flange XTR hub (covered here), which reduces weight by 3 grams and allows for a wider spoke bracing angle and more even spoke tension.

All three of these cassettes employ what Shimano calls its Beam Spider construction, where in the case of the 12-speed set-up, aluminum (3 largest cogs), titanium (5 middle cogs), and steel (4 smallest cogs) are used, “for an optimal blend of weight savings, rigidity, and durability,” says Shimano.

New Shimano XTR

All three new cassettes employ Beam Spider construction.

The rationale for the three cassette gearing options is simple: choice. Shimano says that in talking with both pro XC and enduro racers, they found that many of them preferred either less weight or better gear steps over wider gear range. And since the “R” in XTR stands for race, Shimano listened. But while choice is nice, Shimano also revealed that 100% of the OEM spec requests for Shimano-equipped bikes slated for the North American market next year were for standard 10-51 set-ups, and that in Europe the number was 95% for 10-51, and just 5% for the other two. Clearly max gear range is what most consumers want — or at least that’s what the bike industry thinks. (Mtbr would have to agree.)

Direct Mount Cranks

Key point No. 2 focuses on the Hollow Tech II crankset, which will be available with both single and double chainring set-ups. Chainrings are now easily exchanged thanks to a direct-mount system, and cranks can be swapped between single and double front chainring setups.

New Shimano XTR

Chainrings are easily exchanged thanks to the direct-mount system.

The single chainrings (round only, no ovals) use a narrow-wide tooth profile and will come in 30t-38t options and two Q-factors, a narrower 162mm that replicates a rider’s road bike position from training, and 168mm for trail/enduro applications. In either case chain line holds at 52mm, meaning Shimano is still supporting non-boost bikes.

If you prefer a 2x set-up (and have a bike that will accommodate it), you’ll get a 38/28 gear combination and again have the choice of 162mm or 168mm Q-factors. Either way, attachment is direct mount with single key release that Shimano says is both lighter and stiffer in part because there are no pinchbolts on the left crankarm. It’s just pressed onto the BB spindle. Shimano has yet to provide any exact crankset weights, but we do have pricing info, which can be found below.

Micro-Spline and What it Means
New Shimano XTR

Micro-Spline features smaller freehub splines that allows for use of a 10-tooth cog.

That brings us to important point No. 3. Part of Shimano’s XTR launch includes the debut of Micro-Spline freehub technology. Not surprisingly, Shimano did not adapt SRAM’s XD Driver standard (they don’t make one-piece cassettes was the rationale given), and instead they created something of their own.

As the name suggests, Micro-Spline features smaller freehub splines that allow for use of a 10-tooth cog, which according to Shimano helps eliminate damage/gouging to the lightweight aluminum freehub body. This technology is found on a host of new Shimano XTR and non-series hubs that are detailed in this post. The new XTR brakes are covered here.

New Shimano XTR

XTR through the years.

It’s also worth noting that there are no wheels in this conversation. Shimano said it decided to focus on their strengths and get their hubs into other people’s rims. That said, DT Swiss is the only other company to have access to the new spline pattern, but not to what Shimano is calling its Scylence system (that’s only available in new Shimano hubs) which delivers 7.6 degrees of engagement for a very direct pedaling feel along with a silent coasting function.

“You really need to experience [the Scylence system] to truly understand,” explained Nick Murdick, Shimano’s North American MTB product manager, who gave the key presentation at the initial XTR press launch at company world HQ in Osaka, Japan, an event attended by Mtbr and small group of other North American mountain bike media. “You can hear how much traction your tires have and it dispels the notion that a loud buzzing noise equals high performance.”

New Shimano XTR

Classic Shimano aesthetics.

That sounds cool for sure, but the press launch in Japan did not include any testing time, so for now all we can do is report Shimano’s claims. The good news is that in mid-June, the Big Blue S is coming to Mtbr’s Colorado headquarters in Crested Butte, where the North American MTB press will get their first opportunity to experience the new XTR group. Stay tuned for our first ride review.

The new freehub body is constructed of two driver plates that completely disengage when you stop pedaling, thus eliminating any freehub ratchet sounds while coasting. Shimano will offer a variety of hub options, including XTR-level with straight pull, as well as a more affordable non-series hub that also includes a straight pull option. Prices range from $530 for a set of straight pull XTR hubs, to $253 for the standard non-series hub option.

New Shimano XTR

Nick Murdick, Shimano’s North American MTB product manager, gave the key presentation at the initial XTR press launch at company world HQ in Osaka, Japan.

One big question, of course, is what does Micro-Spline mean for all the wheels/hubs that you’ve already paid for? The short answer is that if they’re DT Swiss (or a DT Swiss collaboration, think Roval for instance), then you may have nothing to worry about. “DT did not have to make a new hub shell in order to fit the new freehub body,” explained Murdick. “It’s just a new freehub body that can plug into an existing DT system. So DT hubs can be upgraded by getting a new freehub body.”

Of course, that’s contingent on DT Swiss actually offering the new freehub body as an upgrade, which Mtbr has yet to confirm. We’ll update you on that as soon as we know more.

DT Swiss also makes wheels for lots of other people (remember the Roval example) and Murdick believes that in most instances, those hubs will be okay, too. “But there is not a guarantee that it will be upgradable to the new freehub body,” he conceded. “The issue is that the hub shell could touch if it hangs out over the freehub body, because [with the new Micro-Spline system] we do take up just a little bit more space. So yes, there could be a case where a wheel [with DT Swiss made hubs] is not upgradeable. But I think those will be pretty rare.” Let’s hope so…

New Shimano XTR

The new Shimano XTR Micro-Spline freehub.

Bottom line, XTR M9100 series components won’t be available until fall 2018, so let’s call this an evolving story and move on to key point No. 4, the debut of Shimano’s Hyperglide+ technology, which likely will end up being the primary reason why bike makers and consumers will (or won’t) choose new XTR over Eagle XX1.

Smoothest Shifting Ever?
New Shimano XTR

The new XTR chain features an extended inner link plate that connects seamlessly with the new chainring tooth shapes.

Good question. Here’s the Shimano sales pitch. “Building on [our] long history of shifting technology, new XTR M9100 delivers groundbreaking advancements in drivetrain performance with the introduction of Hyperglide+ where the newly redesigned M9100 cassette guides the chain both up and down the cassette, providing faster, smoother shifting in both directions… Adding to XTR M9100’s smooth drivetrain transmission, the new M9100 HG chain features an extended inner link plate that connects seamlessly with new chainring tooth shapes for Shimano’s most efficient drivetrain. The new design reduces natural vibrations normally caused by the inner and outer chain plates rolling onto the chainring and provides better chain engagement, stronger retention, and smoother pedaling.”

Admittedly, the text above is filled with marketing hyperbole. But we know from experience that when Shimano puts its mind to something (especially smooth shifting) they almost always do it really well. Again, though, Mtbr won’t get a chance to test the new group until mid-June.

New Shimano XTR

For enhanced durability, Shimano is using a special surface treatment on the new XTR-specific chain.

In the meantime, here’s how Murdick explained Hyperglide+ shifting. “It’s a faster and shockless system,” he said. “Think about out-of-saddle shifting under full load. The jerk you may normally experience is gone. That means smooth acceleration and that makes you faster. It’s not just a pleasurable shifting experience, it’s a true performance enhancer.”

Murdick added that the chain and cassette interface also enhance drivetrain efficiency. “It’s a different kind of shift ramp technology,” he continued. “The chain holds on to the larger cog until the upshift is finished. Power is actually transferred to the next gear sooner because the chain never spends time in the air floating between gears. It’s faster, smoother, and more efficient.”

The chain and chainring interface also helps with efficiency. “The chain has an extended inner link plate, which allowed us to put the inner link plate in contact with every tooth in the chainring. Instead of an only relying on the alternating wide tooth/outer link, narrow tooth/inner link, the inner link touches every tooth for a perfectly consistent driving engagement. That quiets side-to-side vibration.”

New Shimano XTR

Yes! Quick Link.

Shimano says that for enhanced durability, they are also using a special surface treatment on the new XTR-specific chain, a process that was previously only done on their eBike-specific chain. And yes, the chain has a quick link for easy on-off.

Derailleurs Rear — and Front

The movement of that chain will primarily be handled by one of three new rear derailleurs, which Shimano says are optimized for wide range cassettes whether using single or double front chainring set-ups. The derailleurs feature bigger 13-tooth pulleys and include Shimano’s Shadow RD+ technology for better chain retention and quieter operation. Each different cage lengths (long and short) is designed for different gear ratios, providing systems to work with the new 10-51 wide range cassette, 10-45 rhythm step cassette, plus another derailleur for 2×12 set-ups.

New Shimano XTR

The derailleurs feature bigger 13-tooth pulleys and include Shimano’s Shadow RD+ technology for better chain retention and quieter operation.

The RD-M9100-SGS is the long cage rear derailleur with a 51t max cog size. It works with both 10-51 and 10-45 cassettes. RD-M9100-GS (short cage) has a 45t max and works with both 11-speed and 12-speed 10-45 cassettes, offering better ground clearance due to the 28mm shorter cage. Finally RD-M9120-GS is designed for front double chainring setups, has a 45t max cog size and is compatible with 2×12.

All three are claimed to have lower tension at the low gear position, preventing efficiency compromising high chain tension. There is also a protective bumper on the derailleur cage. Add it all up and you have three cassettes, three rear derailleurs, and four different ways to build up your bike with new XTR.

New Shimano XTR

The Sakai Intelligent Plant and Manufacturing Technology Center in Sakai, Shimano’s birthplace.

And yes, one of those options includes a front derailleur, which Shimano says is better than ever. Indeed, the side swing front derailleur comes with three mounting options (direct mount, E mount, mid clamp) and all three derailleurs work with 49 and 52mm chain lines, i.e. boost or non-boost.

XTR Shifters

Controlling the derailleur(s) are Shimano’s new RapidFire Plus shift levers, which are claimed to offer light operation force and more versatility thanks to a new I-Spec EV lever design that features greater flexibility in mounting for a clean and ergonomic cockpit. And for double chainring systems, the lever simplifies front shifting with a lightweight and compact design that shifts up and down with a single lever.

New Shimano XTR

New Shimano Rapidfire shifting lever.

Additionally the SL-M9100-I and SL-M9100 shifters has a claimed 20% quicker lever access time, 35% less shifting operation force compared to M9000, and 14mm slide range and 60-degree rotation for I-SPEC EV. The SL-M9100-IL and SL-M9100-L control front double shifting with a single lever design, have 2-way release with instantaneous push and pull movements, and provide a natural finger position and intuitive shifting operation.

Now that we’ve covered all the key parts, here’s a little comparative price and weight info. Just note that Shimano has yet to provide a complete weight breakdown.

Weight Comparison: SRAM Eagle XX1 vs New Shimano XTR
  • 12spd Cassette: Shimano 10-51 – 367g | SRAM 1-50 – 360g
  • Rear Derailleur: Shimano Long Cage – 240g | SRAM – 265g
  • Shifter: Shimano – 79g | SRAM – 124g
Price Comparison: SRAM Eagle XX1 vs New Shimano XTR
  • Shifter: Shimano $130 | SRAM $162
  • Rear derailleur: Shimano $260 | SRAM $289
  • Crankset: Shimano: $420 | SRAM $455
  • 12spd Cassette: Shimano $380 | SRAM $420
  • Chain: Shimano $65 | SRAM $85
  • Chainring: Shimano $130 | SRAM $99
Mtbr’s Take
New Shimano XTR

Mtbr was among a small group of North American MTB media who attended the XTR launch in Japan and got to take a tour of their factory.

Without having ridden the new group, it’s hard to say too much about the new XTR. But based on what we’ve seen so far — and what know about Shimano — it’s a pretty safe bet that this new group will do nothing to damage the company’s legacy for making superb high-end mountain bike drivetrains.

And while most riders will default to the standard 10-51 12-speed set-up, the idea that you have some choice is cool, too. I could definitely see a time where the lighter weight 11-speed set-up would make sense (think XC racing on rolling terrain with only short climbs, or an enduro race where the transfers aren’t particularly steep). Why not save a little weight?

New Shimano XTR

New XTR enduro/trail pedals.

The biggest concern is with the new freehub standard. Consumers are sick of the industry’s knack for making things more complicated (and forcing purchases to attain compatibility). But if Shimano’s Murdick is correct about the ease of DT Swiss upgrades, then this won’t be as big a concern. We’ll have to check back on that one.

Of course one thing we’ll all want to see sooner rather than later is a more affordable XT version. And while Murdick wouldn’t reveal too much, he did tell us to expect a second tier 12-speed to launch sometime in 2019.

And that my friends is a wrap on the new Shimano XTR drivetrain — for now. We’ll be posting more as soon as we get some ride time. And again if you want to learn about the other new XTR products, check out this post on brakes and this post on hubs, pedals, and more.

To learn more about the new Shimano XTR drivetrain, head to

About the author: Jason Sumner

An avid cyclist, Jason Sumner has been writing about two-wheeled pursuits of all kinds since 1999. He’s covered the Olympics, Tour de France, MTB world champs, and dozens of other international cycling events. He also likes to throw himself into the fray, penning first-person accounts of cycling adventures all over the globe. Sumner has also done extensive gear testing and is the author of the cycling guide book "75 Classic Rides: Colorado." When not writing or riding, the native Coloradoan can be found enjoying life with his wife Lisa and kids Cora and Tommy in and around their home in the MTB Mecca of Crested Butte.

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  • p brig says:

    If cassettes on these 1X drivetrains that were forced upon us continue to get ridiculously larger, then 29er wheels will be the only viable option simply to keep the derailleur and all of that chain from scraping the ground.

  • wally says:

    Looks awesome ! cant wait for XT version SO….you know what that means !?
    Sram will not take this laying down! expect an XX1 8-54 24K gold plated,titanium billet, NASA APPROVED cassette for just under $1000.00 in 2020 !!!

  • Curmudgeon says:

    Who wants the smoothest shifting ever? I still miss the positive kerchunking of my old 6 and 7 speed drivetrains. I also shudder to think of the costs of this junk.

  • Plusbike Nerd says:

    Looks like Shimano got back in the game. For years they’ve been eating Sram’s dust. With a 10-51 cassette they actually made a drivetrain that has better range, 510%, than the 10-50, 500% Sram Eagle. I’m now expecting Sram to come out with the 555%, 9-50 cassette. Competition leads to better products. The old 10-42 Sram and 11-46 Shimano cassettes just don’t have enough range. I want a 1×12 cassette with the widest range possible that still performs well.

    • Sean Ragot says:

      I’m running SRAM 9 spd.
      Been to BCBR, Moab multiple times, Whistler, Fruita, Sedona on that drive.
      Works well and 2X…

  • Juan Ghuy says:

    Is this compatible with my e-bike? Kidding…

  • Derek says:

    “And while most riders will default to the standard 10-51 12-speed set-up…” Sure, I can see them crowds lining up with $380 in hand (and signing mortgage for the rest of the groupset). Those that actually ride will stick to “budget” 9 and 10 speed options for years to come. Plus, this huge UFO looks like a dork disc on a Huffy

  • benito says:

    I’m always interested that the rear mech, the most fragile and damage-prone part of the bicycle, continues to be the focus of all this innovation. We’re definitely seeing benefits (including drawbacks in complexity and durability), but I keep waiting for some belt drive / internal gearhub setup to really change the game. That’s still a leap from today’s bikes, especially designing suspension systems around a tensioned belt drive, but I have to believe eventually we’ll end up ditching the derailleur completely.

    • Sean Ragot says:

      Agreed needs to “level up” in drive & reliable no flat tire tech rather than just larger pizza gears in order to get me to buy-in.

    • MathIsFun says:

      Not if physics has anything to say. The current chain and gear system has friction losses of 1%. It’s really amazingly efficient. No one has ever done any type of internal system where the loss is under 5%, most are over 10%. No one will wants to lose 5% to 10% of their power on a high performance bike.

  • Euls says:

    E13 Trs+ 11 speed cassette, 511% range, $249.00.

  • dave says:

    +1 to Benito and Sean Ragot. File this under “because that’s the way we’ve always done it”. Yawn.

  • peter chapman says:

    hmm wonder when it will be available on DI2? i can see a nice setup of 10-51 rear with a dual front DI2 🙂

  • Jason says:

    Man, this looks really really nice, but seems impractical in terms of cost, incompatibility with existing hubs and potential maintenance. For example, I wonder how much of a bump to a derailleur hanger it takes to throw the shifting off given the tighter spacing on 12 speed cassettes. Seems like the spacing would also be less happy about mud and other debris, too. It would be one thing if my 3x and 2x XT 9 and 10 speed groups didn’t function fantastically, weren’t easy to maintain and didn’t cost less than one of these 12 speed cassettes, but that’s not the case. To swallow the cost of the new group plus have to abandon a couple sets of really nice wheels because of the new hub standard is a tough ask. I guess everything changes at some point, though. SRAM Eagle seems pretty popular, too, so maybe this will get traction.

  • MathIsFun says:

    10-50 vs 10-51 is basically the same, only a 2% difference, like the article says. But Shimano does get the bragging rights, so kudos to them. The real game changer here is the silent freehub. We’ve never had one before without a significant weight or durability penalty. Looking forward to some quiet rides. Now nothing can drown out my Taylor Swift rocking in my earbuds

  • Bruce says:

    Will the new 10-45 11 speed cassette be compatible with the current XT/11-speed/M8000 shifter, chainring, and derailleur? The gearing ratio, weight and looks would certain be better than the current 11-42 and 11-46. Any information on MSRP?

    • Jason Sumner says:

      Nope. It uses the new Micro-Spline freehub body style so no backwards compatibility.

    • James says:

      Similar question, does anyone know if the new 12 speed derailleur is compatible with a previous generation 11 speed cassette?

  • Bruce says:

    Hub aside (I know i need a new freehub and should have been clear in my first post). My concern is the 11speed cassette has the same spacing as the 12 speed cassette which I think implies at a minimum a new shifter and 12-speed chain. Not sure about the chainring and derailleur?

  • tony a says:

    “Shimano did not adapt SRAM’s XD Driver standard (they don’t make one-piece cassettes was the rationale given), and instead they created something of their own.”

    Yet e13’s 11 sp cassette runs on an XD driver and you have several pieces so you don’t need to replace the whole thing. “Both parts of the TRS+ cassette are individually replaceable and available individually, which means that replacing worn parts is possible without buying a whole new cassette.” I’ll just wait for e13 to come out with a 12sp cassette that you can swap worn parts.

  • Not Again says:

    The bike industry shafting us again. 11-speed forced obsolescence in 3-2-1…

  • Spiro says:

    Will the cassette still be compatible with SRAM derailleurs/shrifters?

  • Ryder says:

    does an XT crankset work with an XTR 12-speed groupo?

  • matthew says:

    does anyone have any suggestions on a full suspension frame that is compatible with Shimano XTR products?

  • giorgio says:

    the new shimano xtr m9100 chain is compatible with the old shimano xtr m9000 crown? thank you

  • Charles says:

    Anyone know when the 10-51 12 speed cassette will be commercially available?

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