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  1. #1
    mtbr member
    Join Date
    Jul 2010

    1x10 XT Conversion Questions . . .

    I'm shopping around for a crankset to complete my drivetrain upgrade to XT 1x10. I plan on getting the M780 3x10, which is $80 cheaper on Jenson than the M785 2x10, removing the three chainrings, and putting on a E-Thirteen guidering. My two questions are:

    1. Will I have any problems starting with the 3x10 M780, or should I go with the M785 2x10?

    2. I'm currently running a 32T middle chainring, but would like to change it to help out a little more on steeper climbs. I assume I should go up in teeth count for this? What are the benefits/drawbacks of going to 34T or 36T? I'll be running a 11-36 cassette, up from an 11-32 9-speed I'm using now.

    Last edited by ccarbot; 06-05-2013 at 03:03 PM.

  2. #2
    mtbr member
    Join Date
    Jan 2009
    1. Should be no difference. Might be easier to mount a bashguard on the M780 though.
    2. You want to go down in tooth count to make it easier to spin on steeper hills. Unfortunately, 32T is about the smallest you can use with the 104BCD on the cranksets. Some manufacturers do make a 30T chainring but it is offset by a couple mm to clear the spider.

    If you cannot easily spin a 32-32, a 32-36 won't make a huge difference. It may be best to stick with 2x10.

  3. #3
    mtbr member
    Join Date
    Jul 2010
    Thanks for the reply, acuracing. I went ahead and ordered the M780.

    As for the teeth, I'll just keep the middle 32T ring then. I'm actually already running a 1x9 with the Deore drivetrain that came stock with the bike. I never left the middle ring when I was running 3x9, and I don't know if it's psychological, losing some rotating mass, or me just continuing to get stronger the more often I ride, but my climbing has improved since making the switch. There's still two steep, fairly long tech climbs that kick my ass though, so I was hoping for a little added edge. Guess I'll have to conquer them the hard way.

    Thanks again!

  4. #4
    mtbr member
    Reputation: Nater's Avatar
    Join Date
    Jan 2004
    If you find you want to go smaller than the 32, there are a couple manufacturers that are making 30 tooth rings that will fit on a 104BCD crankset.

    Wolf Tooth Components
    Race Face

    Or you could go with a SRAM X9 and use a spiderless ring from WTC, MRP, or North Shore Billet and go down as low as 27 teeth.

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