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  1. #1
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    27.5 & 29: 2x10 vs 1x11?

    Knowing and trying to gloss over the angst of the wheel size wars...

    All things being equal, if you were to get an FS 29 and an FS 650b, which would have 2x10 and which would get 1x11?

    Looking at new rides for my wife and myself, and wondering if one gearing format makes more sense of one over the other.

    Assuming XC usage, strong riders in the southeast US ( i.e., no seven mile climbs locally ).

    Thoughts? Thanks in advance.

    BTW, my current ( and only, for now ) MTB is an SS 29er.

  2. #2
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    If price were no object, either would get 1x11.

    If I'm constrained by price, I'd go 1x10.

    I've grown to dislike front derailleurs.

  3. #3
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    If I had two groups to put on those two bikes, the 29er would get the 2x10, and the 650b would get the 1x11.

    Reasoning: I feel the 29er will be better on the road and super steep climbs than the 650b, so the added range of the 2x10 would be beneficial. If I had the option, I'd go 1x11 on both.
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  4. #4
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    27.5 & 29: 2x10 vs 1x11?

    1xXX. Front derailleurs are a Satanic invention! If you're strong riders and don't have tons of climbing, 1x10 is plenty. Go 1x11 if the budget allows. XX1 shifts SOOO smooth! Hurry up SRAM, and produce the X9 version so I can afford it

  5. #5
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    I had a chance to ride the new Giant 27.5 Trance for 2 days, I still prefer my Trance X 29er, because its better in downhill and climbing. However Giant 27.5 Trance excellent in tight turns than Trance X 29er.

    if you have money go for 1x11 coz you have all the gears available for climbing and downhill.

  6. #6
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    Go 1x, but get a bigger chainring.

    That granny won't see much use if you go for a 2x setup in the SE part of the US, unless you're riding 4+ hr epics and your body can barely take it. Probably more just for convenience, for shifting to a lower gear if you enter something in a gear too high. I've grown tired of chain drops and missed shifts with 2x.

    Don't really need to go with SRAM's XX1. You'd be paying about $1200 for each XX1 groupset, and would need a XD driver compatible rear hub. With that kind of money, you can probably kit both of your bikes with XTR/XT kit in a 1x setup, with a XTR M986 Shadow+ RD ($130 @ merlin cycles), $300 for a XTR crankset (various places), RaceFace 34T Narrow Wide ring ($35 @ Universal Cycles), under $80 for a XT/X9 level cassette, XT 786 shifter (was $55 at Nashbar), and XT level chain ($30 competitive cyclist). Most less costly to replace worn parts as well. It's $60 for a XX1 chain, $400 for the XX1 cassette, $100+ for chainrings, and pray that you don't bust a $200+ RD, that doesn't have any vertical give, on a rock or root (a hit in another direction might break the RD hanger, but pray that it doesn't get caught in the spokes).

  7. #7
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    I run XX1 on my bikes, I was on XX 2x10 for about 18 months before that & as nice as the front shifting was for a 2x set up, I doesn't hold a candle to just how well the XX1 works.

    I myself will not be going back to 2x

    My wife has a Jet9 RDO setup with X0 2x10 & I have just set up her Air9 RDO with XO cranks & wolftooth front ring & Sram type 2 rear derailleur .

    After 2 rides with the 1x10 setup on her Air9 RDO she has asked me to setup her Jet9 RDO the same way.

    Note Running the X9,X0 or even the XX1 cranks give you so many chain ring options, Anything from Wolf Tooth 26 tooth direct mount ring through to 38 XX1 ring if you choose a NSB 1x11 spider & many other options to.

  8. #8
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    27.5 & 29: 2x10 vs 1x11?

    Run my 29" 2X10, with 30T Anderson ramped 104bcd ring & 22T granny. My 27.5" is 1X10 with 30T direct mount WTC ring. At my age and ability 30:11 on either wheel size suffices as high gear, just barely. Need something lower than 30:36 the 27.5" though, short of new 11 speed drivetrain. Maybe General Lee 11-40T SRAM cassette adapter?
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  9. #9
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    1x10/11 for both

  10. #10
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    You only need 2 x 10 if you ride your mountain bike in the mountains!
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  11. #11
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    Quote Originally Posted by kosmo View Post
    You only need 2 x 10 if you ride your mountain bike in the mountains!
    I run a 28T on my XX1 if I ride in the mountains.
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  12. #12
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    Quote Originally Posted by homeless junkie View Post
    I run a 28T on my XX1 if I ride in the mountains.
    Me to, I have just ordered 26 wolf tooth for when I want to ride up a wall.

  13. #13
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    Sorry for slight OT but can you run double rings on an XX1 Q156 crank? with an XO 2x spider? Curious if anyone has tried this, I am thinking about switching over to 1x10 but would like to have the option of a double for certain rides/races. Would be nice to get by with one crank for both setups.

  14. #14
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    Yes the xx1 crank is really the X0 crank so you can fit a double chain ring on that crank.

    However there is not enough movement in the XX1 rear derailleur to cope with both the XX1 cassette & a Double ring setup.


    Quote Originally Posted by fastezzie View Post
    Sorry for slight OT but can you run double rings on an XX1 Q156 crank? with an XO 2x spider? Curious if anyone has tried this, I am thinking about switching over to 1x10 but would like to have the option of a double for certain rides/races. Would be nice to get by with one crank for both setups.

  15. #15
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    Thanks for the reply. I wouldn't be using the XX1 der. though, probably XT Shadow Plus 10 speed as I am a Shimano fan myself. Might try the XX1 crank setup though.

  16. #16
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    Just to add to what muzzanic said, beware that there's 2 different spiders. One for BB30 with more outboard offset, and one for GXP. Mismatch the spider and crank type and your chainline won't be optimal (chainline affects power transfer efficiency, chain wear, how tolerable cross chaining would be in the extremes, and chances of chain drop up front, among other things).

  17. #17
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    Thanks for everyones' input so far.

    Having looked further into this, including gear-inch and ratio charts, the 1x solution sounds very promising on a lot of levels...which is why it's becoming so ubiquitous.

    The XX1 options are still pretty stupid expensive. I'm not averse to dropping serious coin on my hobbies, but the cassette price is enough to choke a horse.

    That said, a 1x10 would serve my needs, abilities, and primary terrain. Heck, my last 26 FS was 3x9, and I almost never left the 32T chainring, locally. I could have removed the F Der, F shifter and two chainrings years ago.

    Thanks again. Please feel free to continue adding to the thread!

  18. #18
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    Think about your body as well. I get sore knees on my 1*11, but not on the 2*10 from mashing up steep pinches rather than spinning.

    From a common sense POV , you'd want 2x10 for th 29er because the gearing on a 29 is harder than on the 27.5.

  19. #19
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    27.5 & 29: 2x10 vs 1x11?

    Quote Originally Posted by pharmaboy View Post
    Think about your body as well. I get sore knees on my 1*11, but not on the 2*10 from mashing up steep pinches rather than spinning.

    From a common sense POV , you'd want 2x10 for th 29er because the gearing on a 29 is harder than on the 27.5.
    Agreed.

    On my 27.5", I can attach a Wolf Tooth direct mount ring to X9 crank and add General Lee 11-40T 10sp cassette adapter to 10 sp SRAM cassette, and get a wide range 1X10 for a fraction of XX1 cost. With type 2 rear mech, no chain retention add on needed either.

    True, XX1 gives you a higher high and a lower low, but at a huge premium. To spend or not to spend is the question.
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