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  • Perfect! Found some cheap 3DF cranks on ebay minus rings .. need to run 1x anyway.

    Now I hope I can run them using 4130 BB on this frame which says BB86.5.

    Did you just remove the old bearings and pressed the rotor ones in?

  • yup - knock out the old bearings and press in the new ones. The 4130 bearings were noticeable stiffer than normal bb30 ones to start with - soon loosened up though.

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