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  1. #1
    mtbr member
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    20T ring on XT M770 crankset clearance?

    I would like to put a 20T ring on my XT M770 3x9 crankset with a 10 speed chain. Anyone out there that have done this? I'm afraid that the chain will rub on the posts that the ring attaches to, because the chain comes pretty close to the posts with the stock 22T ring.
    Thanks,
    Shawn
    '96 San Andreas
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  2. #2
    I Tried Them ALL... Moderator
    Reputation: Zachariah's Avatar
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    You need four 2mm metal spacers.....done!
    "The mind will quit....well before the body does"

  3. #3
    official eMpTyBRain
    Reputation: Hawg's Avatar
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    Do you climb some extremely steep terrain? Why drop down to a 20 tooth?

    What size is your cassette?
    ...and proud member of the anti-sock puppet desolation

  4. #4
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    Quote Originally Posted by Zachariah View Post
    You need four 2mm metal spacers.....done!
    No shifting problems? Or rubbing problems in the front derailer?

    Quote Originally Posted by ambassadorhawg View Post
    Do you climb some extremely steep terrain? Why drop down to a 20 tooth?

    What size is your cassette?
    Yeah, around here everything is either up or down. Cassette is 11-34, 9 speed. I really don't want to increase my weight by putting on a 36T and losing my 11T on my cassette.
    '96 San Andreas
    '12 Santa Cruz Nickel LT
    '08 KTM 530
    '12 Toyota FJ TT
    '05 MiniCooper S
    '95 Honda HB Si
    '71 Dino 246 GT

  5. #5
    I Tried Them ALL... Moderator
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    Quote Originally Posted by Mountain Cycle Shawn View Post
    No shifting problems? Or rubbing problems in the front derailer?
    Zero. The spacers makes it work flawlessly.
    "The mind will quit....well before the body does"

  6. #6
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    I used a 20t on a 3 ring xtr 970 crankset. Got it from www.mountain-goat.de

  7. #7
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    Quote Originally Posted by Zachariah View Post
    Zero. The spacers makes it work flawlessly.
    What about the chainring bolts? I might try this, but I doubt it will work.

    This is a good thread for how to do it: 20x36 options - Mtbr Forums

    4crawler was right in the above thread, you have to grind a lot off. 10 speed or 9 shouldn't matter, but for some reason I got the action tec to work easier than the ebay ring.

  8. #8
    I Tried Them ALL... Moderator
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    The 20t front and 34t rear combo works great, for the steepest climbs. So what if you can hike it on foot faster? The fact I don't have to put a foot down and keep pedaling, makes it all worth it!
    "The mind will quit....well before the body does"

  9. #9
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    ^ yeah, there is a pride factor involved. I'm not a good climber, and I don't really even enjoy it. I don't care how slow I am, as long as I don't have to get off.
    '96 San Andreas
    '12 Santa Cruz Nickel LT
    '08 KTM 530
    '12 Toyota FJ TT
    '05 MiniCooper S
    '95 Honda HB Si
    '71 Dino 246 GT

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