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  1. #1
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    mixing chain rings

    I want to put a 39t round inner ring on my oval biopace crank set.The bcd is identical.Is that acceptable?Can I expect any problems?The original ring is 42t and I could use the help on the hills.

  2. #2
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    In the days when oval/biopace rings were common it wasn't unusual to find them that way from the factory. I still have a Sun Tour labled crank that ismoval, oval, round on the big ring and have put together sets will mixed rings without problems. Roger

  3. #3
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    Not unless you are in love with the Bio-pace rings.

  4. #4
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    Ive never had a problem when replacing biopace with a normal chainring.

  5. #5
    7-speed doomsday prepper ThermionicScott's Avatar
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    40T 130BCD Biopace rings are rare, but sometimes come up for sale. A cassette swap could help, too.
    Quote Originally Posted by chandltp View Post
    There's no such thing as too far.. just lack of time
    RUSA #7498

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