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Dyna-Sys: Shimano's new 10-speed MTB drivetrains

  • By VeloNews.com
  • Published Apr. 15, 2010
  • Updated Oct. 11, 2012 at 5:08 PM EDT

Click to enter full Shimano Dyna-Sys gallery

You knew it had to happen eventually. The question was not “if,” but “when” and “how” would Shimano go about creating a 10-speed mountain bike drivetrain. Now those questions have been answered. That’s right — at the Sea Otter this week, Shimano finally revealed its 10-speed off-road drivetrain.

But the answer to “how” might come as a slight surprise, as Shimano’s 10-speed cogset and corresponding drivetrain improvements will appear first on XT and SLX groups, as part of what Shimano is calling the Dyna-Sys drivetrain. And for now, the 10-speed cogset will be paired with conventional triple cranks, albeit with revised chainring sizing and spacing.

Dyna-Sys

Perhaps acknowledging that 10-speed mountain bike drivetrains are not entirely revolutionary to the sport, but do mark a new era for the company, Shimano calls Dyna-Sys “Shimano’s generational improvement of mountain bike drivetrain technology.”

The Dyna-Sys moniker refers to the family of compatible 10-speed components meant to function optimally together. Dyna-Sys XT and SLX components will be compatible, and any potential future components wearing the Dyna-Sys label would likely be up- and down-spec compatible within the family.

Shimano’s goal with creating Dyna-Sys is to improve drivetrain efficiency by creating a more closely spaced front gearing range paired to a wider range 10-speed cogset. Basically, the small chainring is bigger (24 teeth vs. 22), the middle ring stays the same (32 teeth), and the big ring is smaller (42 teeth vs. 44). Shimano says this narrower triple crank range paired with a wider 11-36 cogset results in smoother and more intuitive shift patterns plus smaller interruptions in cadence and pedaling rhythm. Chain tension is also reduced in certain gear combinations by more than 30 percent (for example, riding in the 32t chainring and 36t cog, instead of the equivalent 22t chainring and 25t cog).

Further, by permitting a wider range of effective gearing from the frequently used 32-tooth middle ring, Shimano says that the Dyna-Sys drivetrain should work well with the pivot locations on most full-suspension bikes currently on the market, essentially creating a more stable, integrated platform between drivetrain and bike.

XT, SLX get Dyna-Sys’ed

For now, rather than marking the wholesale reworking of one or more entire component groups, Dyna-Sys technologies will be  integrated into the existing design cosmetics of XT and SLX groups. Starting in about June, XT and SLX groups will grow by one gear in the rear and get new chainrings, but won’t otherwise change significantly in form or function. Shifters and derailleurs will be subtly redesigned to work with 10-speed, but won’t look different.

Naturally, the centerpiece of Dyna-Sys is a new 10-speed cogset. It will be available in both XT and SLX trim in 11-34 and 11-36 combinations.

The cogset is joined by a new directional asymmetric HG-X 10-speed mountain bike chain, the familiar XT or SLX cranksets bolted to new chainrings, derailleurs with revised plates and increased gear capacity, and rear shifters with more detents.

XTR and Dyna-Sys?

Shimano’s Dyna-Sys answers a few questions, but of course raises new ones. It’s impossible not to imagine the 10-speed upgrades making their way up to the flagship XTR level, but Shimano is keeping quiet.

We’re willing to bet that the “if” question is a foregone conclusion, but stay tuned for another round of “when” and “how.”

2011 Shimano Deore XT Specs:

RD-M773 – XT Shimano Shadow Rear Derailleur
Low Profile Shimano Shadow rear derailleur design reduces the component profile by 15mm less than a traditional design in high gear.
Top normal spring design to mesh with the more common choice of RapidFire shifters for trail / all-mountain riding
Sealed bearing guide and tension pulleys
Available in medium and long cage (GS and SGS)
Total capacity: 43T (SGS), 35T (GS)
MSRP: $129.99

FD-M770/771-10 Front Derailleur
Specific 10-speed cage design
Available in Top Swing, conventional, or E-type configurations.
Adaptable clamp means one size fits all for 28.6, 31.8, 34.9 and multi-pull allows top- or bottom-cable pull.
Set screws are angle outward for easier adjustment on some full suspension designs
Clamp band positions is the same for 9s and 10s versions
Cage profiled for more tire clearance
MSRP: $59.99

SL-M770-10-R RapidFire Plus Shift Lever (rear)
Additional rear shifter option with 10s vs. 9s
Alloy main lever
2-way release trigger allows thumb or finger actuation
Two position clamp band for tune-able ergonomics
Multi-bearing construction
Removeable optical gear display
MSRP: $99.99 (set, front lever same as 9s)

FC-M770-10 Front Chainwheel
Hollowtech II design maximizes stiffness while keeping weight to a minimum
Precision two-piece construction for perfect chainline and chainwheel alignment.
42T-32T-24T
Carbon / Steel composite middle ring adds rigidity for better shifting, increases service life, and smoothly delivers powers to the cassette.
Outboard bearings maximize stability and stiffness
MSRP: $359.99

CS-M771-10 Cassette
Largest 6 cogs on two spiders for light and rigid construction
11-13-15-17-19-21-24-28-32-36 and 11-13-15-17-19-21-23-26-30-34
Alloy lock ring
MSRP: $114.99

CN-HG94 Chain
HG-X direction chain
Inner and outer plates feature asymmetrical design to optimize front and rear shifting
Zinc-alloy plated for maximum durability
Uses standard connecting pin
MSRP: $49.99

2011 Shimano SLX Specifications:

RD-M663 – SLX Shimano Shadow Rear Derailleur
Low Profile Shimano Shadow rear derailleur design reduces the component profile by 15mm from a traditional design in high gear.
Top normal spring design to mesh with the more common choice of RapidFire shifters for trail / all-mountain riding
Available in long cage (SGS)
Total capacity: 43T (SGS)
MSRP: $89.99

FD-M660/661-10 Front Derailleur
Specific 10s cage design
Available in Top Swing, conventional, or E-type configurations to mount on most any frame
Adaptable clamp means one size fits all for 28.6, 31.8, 34.9 and multi-pull allows top or bottom cable pull .
Set screws are angle outward for easier adjustment on some full suspension designs
Clamp band positions the same for 9 and 10s versions
Cage profiled for more tire clearance
MSRP: $49.99

SL-M660-10-R RapidFire Plus Shift Lever (rear)
Additional rear shifter option with 10s vs. 9s
Alloy main lever
2-way release trigger allows thumb or finger actuation
Two position clamp band for tune-able ergonomics
Removeable optical gear display
MSRP: $64.99 (set, front same as 9s)

FC-M660-10 Front Chainwheel
Hollowtech II design maximizes stiffness while keeping weight to a minimum
Precision two-piece construction for perfect chainline and chainwheel alignment.
42T-32T-24T
Graphite / Steel composite middle ring adds rigidity for better shifting, increases service life, and smoothly delivers powers to the cassette.
Outboard bearings maximize stability and stiffness
MSRP: $239.99

CS-HG81-10 Cassette
Largest 3 cogs on spider for light and rigid construction
11-13-15-17-19-21-24-28-32-36 and 11-13-15-17-19-21-23-26-30-34
Alloy lock ring
MSRP: $84.99

CN-HG94 Chain
HG-X direction chain
Inner and outer plates feature asymmetrical design to optimize front and rear shifting
Zinc-alloy plated for maximum durability
Uses standard connecting pin
MSRP: $44.99

FILED UNDER: Bikes and Tech / MTB / News / Sea Otter Classic TAGS: / /

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