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  1. #1
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    Shimano105 late 80's-early 90's, Need Help

    I removed my front chainring (42) and the 53 and need to replace the chainrings. This bike is used in the early spring due to the weather. I would like to know if anyone has any info on where I could purchase new chainrings and hopefully the spacing will be the same. I would like to make the inner a 39 tooth since the bike is an old ALAN frame with a 6 sprocket freewheel. I also have to buy a new derailler pulley wheel, chain, and some cables. Any recommendations on purchases is greatly appreciated.

    thanks

  2. #2
    cab horn
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    Any bike store will have the correct chainrings for that crankset.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  3. #3
    cat person GlassWolf's Avatar
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    you can pick up Biopace II chainrings on eBay for $10 each or so.
    130mm BCD for the 105 crank if I'm not mistaken. Easily measured to be sure.
    As for cables, chain etc, Nashbar has generics pretty cheap.
    GlassWolf
    Organ Donors Save Lives.

  4. #4
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    Aebike, JensonUsa and similar have tons of bike parts.
    Check the chainrings by Sugino.
    http://aebike.com/page.cfm?PageID=30...ils&sku=CR1539

    Don't forget to measure the Chainring BCD first:
    http://www.hostelshoppe.com/tech_bol...e_diameter.php

  5. #5
    Velocommuter Commando Sirrus Rider's Avatar
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    Quote Originally Posted by grall1126 View Post
    I removed my front chainring (42) and the 53 and need to replace the chainrings. This bike is used in the early spring due to the weather. I would like to know if anyone has any info on where I could purchase new chainrings and hopefully the spacing will be the same. I would like to make the inner a 39 tooth since the bike is an old ALAN frame with a 6 sprocket freewheel. I also have to buy a new derailler pulley wheel, chain, and some cables. Any recommendations on purchases is greatly appreciated.

    thanks
    You can even ditch the biopace for round rings. I was never able to spin biopace smoothly; consequently, a buddy of mine had some campy round rings. (he went to a 53 outer) that he gave me and I've been using ever since..

  6. #6
    Just ride. roadbuzz's Avatar
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    Second GrassWolfs advice. Biopace or not, be sure to check the BCD before purchasing.

    http://www.hostelshoppe.com/tech_bol...e_diameter.php

    http://www.branfordbike.com/chains/chains1.html
    (scroll down to Chain Ring measurements made easy...)

  7. #7
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    Quote Originally Posted by Sirrus Rider View Post
    You can even ditch the biopace for round rings. I was never able to spin biopace smoothly; consequently, a buddy of mine had some campy round rings. (he went to a 53 outer) that he gave me and I've been using ever since..
    How did you fit Campy chainrings (135 mm bcd) to a Shimano crank (130 mm bcd)?

  8. #8
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    Quote Originally Posted by HillRider View Post
    How did you fit Campy chainrings (135 mm bcd) to a Shimano crank (130 mm bcd)?
    That's easy. His Biopace had 110mm BCD,
    http://harriscyclery.net/itemdetails.cfm?ID=2332
    and the Campy chainrings were from a compact crankset.

  9. #9
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    good answer

  10. #10
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    Quote Originally Posted by Barabaika View Post
    That's easy. His Biopace had 110mm BCD,
    http://harriscyclery.net/itemdetails.cfm?ID=2332
    and the Campy chainrings were from a compact crankset.
    Even that may not explain it. Campy's compact chainrings had a proprietary bcd with one of the bolts off-set from the standard 110 mm bcd to keep you from using "inferior" chainrings on a Campy crank.

  11. #11
    Senior Member MrCjolsen's Avatar
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    If it was 42 and 53 tooth rings, I'm almost certain it was 130bcd. Yes you can use a 39. It does not have to be biospace.

  12. #12
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    Quote Originally Posted by HillRider View Post
    Even that may not explain it. Campy's compact chainrings had a proprietary bcd with one of the bolts off-set from the standard 110 mm bcd to keep you from using "inferior" chainrings on a Campy crank.
    The aluminum Campagnolo compact cranksets use standard 100mm chain rings, the plastic ones is a different topic.

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