SRAM XX1 Drivetrain 1x11- Mtbr.com
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  1. #1
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  2. #2
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    I love my 1x setup. One the best upgrades? I have done.
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  3. #3
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    Lol...10 years from now cassettes will be the size of rear wheels

  4. #4
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    That chain ring tooth profile looks interesting. If it means that no chain guide is needed (along with the clutch in the RD), then this could be good!

  5. #5
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    Love 1x systems, some interesting ideas - SRAMS front chainring tooth concept intrigues me, although I love the security of my chainguide.
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  6. #6
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    The chainring teeth look neat. I wonder, though, if it will need a special chain of a new design, other than thinner.

  7. #7
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    id like a cassette the size of a dinner plate please.

  8. #8
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    Very cool. I've stuck with 1x9 (32/11-34) for a long time now but am looking forward to how this plays out.
    If the front ring tricks work out it'd be pretty sweet. No more guide?!

    The downside to these wide-spread cassettes is the need for a long cage derailleur, which I'd be willing to do if it works.
    Ultimately the goal is to do away with the front derailleur, something 2x10 didn't do. A 10x42 cassette should look pretty funny, but at least it's not rotating momentum. I for one don't give a crap how my bike looks.
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  9. #9
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    I like the push to making 1x10s a bit wider in range, but I'm struggling to see why someone would go with sram xx1 over the 9-36 cassette and a 28t ring that is available on the microdrive (such as canfield/hope and MRP bling ring). If you do the math the new monster 10-42 cassette isn't giving you any extra spread but requires going to a new rear derailleur, shifter, etc. The advantages of going smaller on the microdrive are that you keep a lot of the standards, you are saving weight and you gain a bit more bb clearance (more important to me than weight).

  10. #10
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    I'm surprised that more people aren't talking about this. It could be the start of a significant change in drivetrains. I'm still on 9 speed but this could be a game changer.
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  11. #11
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    I am holding out for the 12 speed cassette. Eleven seems like an odd number.

  12. #12
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    I'm actually looking at this for a new 1x9 build. I was going to use the XX crank for the low q-factor, but this will get me a clean 1x setup as well (instead of having to use a bash ring).

  13. #13
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    Long toothed front ring (Salsa, Homebrewed etc), XTR clutch mech RD and proper chain length on a 29er hardtail: No need for a chain guide. Have tried in vain to get the chain to fall off on fast bump descents, holds on like a champ!

    Not going 1 x 11 for a long time. My 1 x 10 is just too good!

  14. #14
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    Im happy with my current 2X9, which has 24T/34T Chainrings and a 11-36T cassette. I like the idea of a single front chainring, but I dont think this new system would suit me. I like to think that I would ride in the middle ring most of the time, but the reality is that I'm usually spinning out in the granny. I could this working for me if it covered most of my Granny range and some of my Middle Ring spread.

    Is there a simple Gear Inch calculator available you guys know of?

  15. #15
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    Quote Originally Posted by KeviChe View Post
    Is there a simple Gear Inch calculator available you guys know of?
    Check out http://www.gear-calculator.com/

  16. #16
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    How does the clutch work? How does it allow for backpedal?
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  17. #17
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    Old, over weight guy here. If I had a little lower 1st gear, and a little taller 9th gear, I would be very happy. Not sure why you have to have so many gears, (11), it would make sense to just have a little larger gap between each gear to accomodate a larger gearing spread. But, if 11 gears is the only way to achieve this, so be it. I'll buy it if it works.

  18. #18
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    Quote Originally Posted by Whitebull View Post
    Old, over weight guy here. If I had a little lower 1st gear, and a little taller 9th gear, I would be very happy. Not sure why you have to have so many gears, (11), it would make sense to just have a little larger gap between each gear to accomodate a larger gearing spread. But, if 11 gears is the only way to achieve this, so be it. I'll buy it if it works.
    Makes the jump between gears far more pleasant. Fewer gears with the same spread means a much larger gap between gears.

  19. #19
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    I see. I love my single ring front, so I'll keep a close eye on this product development. Or maybe just loose a few lbs........
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  20. #20
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    Quote Originally Posted by sslikesnake View Post
    How does the clutch work? How does it allow for backpedal?
    From BikeRadar
    The SRAM and Shimano clutch rear derailleurs are similar in design intent – in both cases, forward pulley cage movement is permitted, but significantly restricted in speed – but their methods are quite different. Shimano opt for an adjustable steel band lined with friction material and clamped around the pulley cage shaft, while SRAM have built a miniature one-way roller clutch that — ironically enough — is similar to the guts inside Shimano's old Silent Clutch rear hub.
    From Bike Rumor
    TYPE 2 derailleurs use a fully enclosed, non-serviceable roller clutch to add a significant amount of rearward pull to the chain. In our test rides on some fast, rough descents and drops, they virtually eliminated chain slap and noise. In fact, I don’t recall hearing any chain noise whatsoever. It’s impressive.
    From Dirt Rag
    Unlike Shimano’s metal-on-metal friction band, SRAM utilizes what they call their Roller Bearing Clutch. This one-way clutch damps the derailleur’s spring force to greatly reduce chain slap and chain instability on rough terrain. Said damping is tuned from the factory, requiring neither adjustment nor maintenance through the life of the derailleur. The polymer roller bearings in the clutch are self lubricating, requiring no maintenance for the life of the derailleur.

  21. #21
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    Quote Originally Posted by Shalom View Post
    Thanks!
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  22. #22
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    I ride my 2x like a 1x with a bailout granny gear for those rare times when I need it, so the idea of 1x11 is interesting. For me though, the deciding factor for something like this is cost. I prefer Grip Shift, but I have to live within a realistic budget, so I just converted my new 29" HT from 2x10 to 2x9 because I just can't spend $200+ for 10 speed Grip Shift. If SRAM eventually hits the X7/X9 price range with 10 speed twisters, I'll consider 10 speed a possibility, but I suspect that 11 speed for those at my level will remain out of reach for a few years to come.
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  23. #23
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    Quote Originally Posted by SaddleRags View Post
    I like the push to making 1x10s a bit wider in range, but I'm struggling to see why someone would go with sram xx1 over the 9-36 cassette and a 28t ring that is available on the microdrive (such as canfield/hope and MRP bling ring). If you do the math the new monster 10-42 cassette isn't giving you any extra spread but requires going to a new rear derailleur, shifter, etc. The advantages of going smaller on the microdrive are that you keep a lot of the standards, you are saving weight and you gain a bit more bb clearance (more important to me than weight).
    Couldn't agree with this more, I don't get it. I already flex the heck out of a 38 tooth cog (not to mention the extra stress/leverage on your freehub, axle, bearings etc) can't imagine running a 40 tooth cog and the extra flismyness 11 speed will bring.....good luck! Seems to me shimano is starting to pull ahead in the components race as the servo wave brakes blow avids out of the water

  24. #24
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    I already flex the heck out of a 38 tooth cog (not to mention the extra stress/leverage on your freehub, axle, bearings etc) can't imagine running a 40 tooth cog and the extra flismyness 11 speed will bring
    Good point about the flex, I didn't even think of that...

    The thing that surprises me the most on the Sram thing is that they already have the jump on the market as far as microdrive goes since their X0/ X9 cranks can go spiderless and will take the MRP blingring. Kinda funny that they went the other way on this and went bigger??

    It will be interesting to see what Shimano comes out with along these lines. They gotta be cooking something, right?

    Really, I'm set for now with my 2x10 but hopefully in a few years (if I can curb my bike whoring for that long) things will be sorted out and I won't have 8 "standards" for drivetrains to chose from.

  25. #25
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    I've been thinking about a 1x for awhile, but we have real climbing here and I'm no racer. I can push a 26x32 on a 31lb 29er and a 22x34 on a 35lb freerider (unless I'm bonking) and I regularly ride SS, so looking at the gear calculator I think a 32x42 low might be doable. The tallest gear I don't really care, I coast bombing downhill at that speed anyway. I ditched 3x years ago for the simplicity and I don't miss that third chainring, I'll never go back. I'd have to test ride a bike with 1x11, but I wouldn't hesitate to jump in headfirst if it works for me.

  26. #26
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    i'd rather have an 11-36 with smaller jumps between gears. ran 1x10 and many times felt like i was missing the "right" gear on my local trails.

  27. #27
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    Currently on a 1x9 36x(11-34) on 26" wheels, 180 cranks (Bmx guy, no advice please).

    I've been on the fence on the next step to 1x10, but the XX1 has got my attention, mostly cause I don't want to invest in new cranks, a front shifter, & a F derailleur. Running a 40x(10-42) would be pretty sweet.

    My main worries are with SRAM durability; I don't have the time to pursue warranty parts every other month. We'll have to see.

    I like the concept though.
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  28. #28
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    I like the idea of the simplicity in 1 x 11 but i have the same doubts as i did with 2 x 10.......SAYING THAT THOUGH i tried 2 x 10 on 2 separate 29ers and was a convert immediatley. Im still not strong (or the hills are steeper) to be able to drop the granny yet, and that was my worry but if 1 x 11 was within reasonable prices id entertain the idea but id test ride it first

  29. #29
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    Any educated speculation on when this should hit the market?

  30. #30
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    ^^^^ me too, i am about to build a new bike and the 1 x 10 has passed me by, i have run 1 x 9 on the last 2 geared bikes including my fat bike, might as well buy 1 x 11 if its available. I'll be able to run an HBC spiderless 28-29t on my middleburns for massive front chainring clearance.
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  31. #31
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    Big woo I've been running a 48 tooth rear for years. 48_tooth_cog | Flickr - Photo Sharing!

  32. #32
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  33. #33
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    Quote Originally Posted by big JC View Post
    Couldn't agree with this more, I don't get it. I already flex the heck out of a 38 tooth cog (not to mention the extra stress/leverage on your freehub, axle, bearings etc) can't imagine running a 40 tooth cog and the extra flismyness 11 speed will bring.....good luck! Seems to me shimano is starting to pull ahead in the components race as the servo wave brakes blow avids out of the water
    Please... You've got it all wrong. You can't possibly put enough torque on a 42 tooth ring to flex it. The easier it is to pedal something the less stress on it. Hence on a 3x10 set up you couldn't wear out the small ring in 20 years. I agree on the brakes though, un-beatable.

  34. #34
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    Will this all work with a favorite singlespeed ring, or does one have to pony up for the XXI crank to make it work?

  35. #35
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    Quote Originally Posted by RockyJunky View Post
    Please... You've got it all wrong. You can't possibly put enough torque on a 42 tooth ring to flex it. The easier it is to pedal something the less stress on it. Hence on a 3x10 set up you couldn't wear out the small ring in 20 years..
    With any due respect yoy haven't a clue as to which you speak. The tallest cogs get the most torque simply because I (and most) climb in the tallest cog PERIOD! I typically bend my upper 2 cogs several times a season and only run M771 as nothing else can take the punishment.

    "You can't possibly put enough torgue on a 42 tooth ring to flex it" .....PFFF....go back to school genius.

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