When Shimano started work on the completely redesigned 2011 XTR, it wanted to expand the group’s appeal beyond it’s XC-racing history and offer a top-of-the-line group for all types of riders.
Given the growing variety of riding styles – All Mountain, Trail, Freeride or just plain ol’ classic Cross Country – XTR needed to expand it’s options to suit the varied needs of today’s riders. The XC oriented XTR groups of yesterday just weren’t what more aggressive riders were looking for. The freeriders rocking Saint groups still wanted something more high end, and so XTR has split into two sides: Trail and Race.
After talking to a lot of riders and sponsored racers, Shimano boiled their customers down to three groups: XC racers, gravity and “the rest of us.” The Trail group is really for that middle group called “the rest of us.” We still like to go fast, and we still want lightweight parts, but we want something that is designed to really handle anything we can throw at it.
THE CRANKSET AND GEARING
Debuting earlier this year on their XT and SLX groups Shimano calls their new DynaSys “a generational improvement that increases efficiency with a wide range gear ratio so you stay in a bigger gear longer with less energy loss to chain tension.” It’s a mouthful for sure, but versus a traditionally geared triple crankset, the benefits of DynaSys are:
24T = 10% reduction in chain tension overall versus 22T granny
32T = 30% reduction in tension in 32/36 versus 22/25 (both equivalent to a 0.88 gear ratio)
42T = 30% reduction in 42/36 (or reduced cross chain at equivalent effort)
How does that help? Read “more” for the complete breakdown of the impressive improvements on each component and the system as a whole…

Chain tension causes power loss through chain stretch, chain friction and unwanted suspension movement. On a bigger chainring, there’s less of an angle out on the chain going around the ring, which creates less friction. Most suspension bikes are optimized for riding in the 32 middle ring, so by making the big ring smaller and the granny larger, you’re bringing the gears closer in position to that sweet spot.
Plus closer gearing means less of a cadence change, fewer cadence recovery shifts and less momentum loss.
For the “Race” XTR double cranksets, the gear combos use a 12T difference with the exception of a pro-spec 44/30. Options for us mere mortals are 42/30, 40/28 and 38/26. The smallest of these uses the same crank arm as the triple setups, which means you can remove the outer caps off the big ring bolts and install a bash guard. You could also swap out and run three rings, but you’d want to switch front derailleurs as they’re optimized for double or triple ring set ups. You wouldn’t have to switch shifters, though, just change the setting on the left shifter.
The middle ring on the “Trail” XTR triple cranksets has titanium teeth with a carbon fiber reinforced engineering plastic base, and the granny and big rings are aluminum. On the double cranksets, both rings are aluminum.
REAR DERAILLEUR
Dyna-Sys also promises enhanced stability increasing the lenght derailleur like increase the length of the arm that the cable pulls on, which gives the shifter better leverage over the derailleur spring, leading to Shimano’s light action feel. It also means reduced cable tension, which makes shifting performance less susceptible to lousy cable runs or contamination.
In the photo above, you can see how the arm that holds the end of the housing and the lever that the cable pulls are both extend a good ways off the back of the derailleur. This, combined with the comparatively long throw of the shift lever, gives you incredible leverage when shifting. The result is feather-light shifting going up the cassette, yet it’s plenty snappy going to a harder gear, too. Yes, you have the push the lever a bit further than competing models, but it never feels excessive and the reward is the easiest, smoothest shifting we’ve ever felt. Seriously. Ever. And it’s just as good shifting up and down the chainrings, too.


- 559x21mm Scandium rim
- E-Thru 15mm front axle only
- E-Thru compatible 142×12 rear axle option (solid axle w/ replaceable nut)
- 14g butted spokes
- 1,670g per set with QR rear / 1,700g with 12mm rear
- 559x19mm Scandium rim
- Aluminum axles
- 15mm and QR front hub options (non-swappable)
- 15/17g super-butted spokes
- 1,480g per set