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  1. #1
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    XTR 970 chainring

    I'm thinking about building a drivetrain around the xg-999 cassette which is 11-32 and super light. But I want to keep my low gear ratio that I have with the 22 tooth granny and 11-34 cassette.

    My cranks are XTR 970 - I'll run it 2x with a bash for the big ring.

    The plan is to get an actiontec 21 tooth granny and blackspire 970x 34 tooth middle ring. That's under the 14 tooth capacity of the front derailleur I'm looking at, and keeps about the same gear ratio for the lowest gear.

    I know the blackspire ring will fit since its designed for 970 cranks, but I'm not so sure about the actiontec. Maybe I'll need spacers?

    Does this seem like it'll work ok?

  2. #2
    www.bigrobracing.co.uk
    Reputation: robdeanhove's Avatar
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    Unless the inner ring is made with specific M970 spacing, you'll need some M8 washers. I got a pack of 1.5mm thick washers from eBay for 0.99 to adapt a normal 64mm PCD chainring and it works perfectly on both my bikes.

    Enjoy!

  3. #3
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    thanks for the info. I ordered the chainring from action tec and they said they include the correct spacers. hope this all works!

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