Here is a MAJOR release from SRAM: the all new XX1! The XX1 is a new single ring, 11spd drivetrain. Noting that many riders were striving for a simpler, lighter solution for their trail bikes and 29ers, SRAM came up with the new XX1 group. In fact this isn’t the first time SRAM has stuck out their necks–remember the huge push into 2×10 not too long ago?
The new gear carries nothing over from the present XX models. The XX1 group consists of a crank, rear derailleur, shifter / gripshift, chain, and cassette. This set-up definitely addresses the unique needs of many current designs and fits the trend toward lighter, faster, and more reliable shifting systems. And as 29er chainstays get shorter and shorter, fitting a front derailleur in has become more of an issue. Nixing the front derailleur and its associated shifter also frees up that side of the bar for lock out and dropper post controls.
Internally, the use of the clutch from the Type 2 derailleur improves shifting and reduces chain slap (perfect if your bike is carbon). The new cassette also reduces the need for two or three shifts to get your bike in the right gear. Finally, the wide range of chainrings is perfect for both 29er, 26er, and anything in between.
Driven by a cutting-edge, single-ring carbon crank and seamless component integration, the SRAM 1X drivetrain delivers flawless chain management and faster, more precise shifting. But the relationship between XX1 components goes far beyond fitment. From the X-HORIZON rear derailleur with TYPE 2 technology to the super wide range 11-speed 10-42T cassette, each component is designed to function synergistically with the others, achieving what no other 1X drivetrain has before.
Available October 2012.
Details From SRAM
Crank / Chainrings
New tooth profile alternates thickness by inner and outer links, providing maximum chain control
Carbon arms with forged aluminum spider
CNC-machined rings (28-30-32-34-36-38)
New spider design allows for easier ring changes
Wide/narrow Q factor cranks for BB30 and GXP
Weight: 650 grams with BB (approx.)
Large upper pulley offset automatically adjusts chain gap
Straight parallelogram design with horizontal movement reduces shift force and improves drivetrain performance
12T X-SYNC pulley wheels
TYPE 2 technologies: ROLLER BEARING CLUTCH and CAGE LOCK
New silent pulley tooth design
Weight: 220 grams (approx.)
Bearing design and ratchet mechanism steadied by XD driver body
Creates more stable hub connection
Gear steps optimized across entire range
Wheels equipped for XD driver body available from SRAM and DT Swiss
XD driver body is 6-8g lighter
Weight: 260 grams
SRAM 1X11 X-ACTUATIONfor precise and dependable11-speed performance
Multi-adjustable trigger shifter
MatchMaker X compatible
Carbon cover and adjustablecarbon pull lever
Full Gore Ride-On cable system
SPEED METAL shift indexing (grip shifter)
ROLLING THUNDER ballbearing technology(grip shifter)
JAWS lock-on grip technology(grip shifter)
New 1X11 XX1 specific chain
Designed for maximum strength and wear resistance
Proprietary link finish provides improved life span
So looking at the price tag of the new XX1 you will probably see it appearing on the top tier bike firstly and then possibly working it’s way down in an XO and hopefully an X9 in the near future. But for now it fills the need for top racers and cutting-edge riders alike who can appreciate the advantages the 1×11 offers.
Very interesting! I love riding 1×9 and I’ve been asked about going 1×10 but frankly it hasn’t seemed worth the upgrade for just one more gear. But for TWO extra gears, well that’s at least twice as compelling…
The chart at the end of the post leads me to believe the XX1 will necessitate a new rear wheel (or at least an XD-compatible driver body). Is the XX1 cassette wider than the existing standard?
Just what I need, an excuse to buy another bike. A lot of trails I ride I never never use the small ring on my 2X10 so I can see a 1X11.
Am I getting this right? A 28 and 38 tooth ring and 2 different length chains, and would be perfect anywhere, provided it is quick, and easy enough to change the ring gear.
RoadWarrior, I think you’re right. They even specificly state you don’t need to remove the crank arm to change the ring, which is another appealing aspect of this group. I may end up buying this group when I find a good sale on it and let it sit for my next mountain bike build. I’m wondeirng if my current DT Swiss 350 hubs will be compatible with a driver body swap or something similar.
I think the XX1 is an interesting concept, it goes along with the less is more concept of the 2×10. I’m no where near capable enough to use it though.
I still don’t understand the “straight parallelogram” thing. Can anyone dumb it down far enough for me?
I want this.
Trek7k – you are correct, the cassette is wider than normal and will not work on all wheels. It’ll work on the SRAM Rise 60 wheels and (I think) some newer DT Swiss wheels.
So how much longer till all MTB groups go 11spd? Shimano’s top end road group is going 11 now, only a matter of time till it reaches the dirt.
This sounds like a really cool concept! I would love to give it a try.
Sorry this is not optimum gearing the gap between the 10 and 12 is greater than the gap between the 36 and 42 it should be less. I’m using a 12 13 15 17 20 24 30 40 Sram could lose a gear and still keep the 10 and 42.