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  1. #1
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    Suntour/Shimano Comaptibility

    Overhauling my Le Tour, I need to replace the worn front 52t chainring and the chain, but the 6 speed freewheel seems in good shape, and works well with the suntour alpha-4050 RD (I got it shifting really nicely). So I would prefer to not replace it. I've been looking around and the NOS Shimano BioPace components look excellent and within my price range. I've searched on the forum but didn't get a clear answer on wether or not the Shimano components would be compatible with the Suntour RD and Freewheel. Please let me know. If this needs to be moved to mechanics, that's fine, I just figured since old components, I would post here.

  2. #2
    Senior Member auchencrow's Avatar
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    Quote Originally Posted by xkjzix View Post
    Overhauling my Le Tour, I need to replace the worn front 52t chainring and the chain, but the 6 speed freewheel seems in good shape, and works well with the suntour alpha-4050 RD (I got it shifting really nicely). So I would prefer to not replace it. I've been looking around and the NOS Shimano BioPace components look excellent and within my price range. I've searched on the forum but didn't get a clear answer on wether or not the Shimano components would be compatible with the Suntour RD and Freewheel. Please let me know. If this needs to be moved to mechanics, that's fine, I just figured since old components, I would post here.
    Shimano Biopace chainrings will work with your Suntour RD - if that's what you are asking. Just make sure your crank is compatible with the rings for BCD.
    - Auchen

  3. #3
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    Quote Originally Posted by auchencrow View Post
    Shimano Biopace chainrings will work with your Suntour RD - if that's what you are asking. Just make sure your crank is compatible with the rings for BCD.
    Thanks. Will it work with the freewheel as well?

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    YES. Roger

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    Thanks so much the both of you. I'll post up a thread when it's complete.

  6. #6
    Bianchi Goddess Bianchigirll's Avatar
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    Are you sure want BioPace? You should read up on it. Normally BioPace rings are a bargain simply because there is little interest in them.

    I actually find it odd that your chainwheel is worn but not the freewheel. how old or roughly how many miles on the chain?
    Bianchis '87 Sport SX, '90 Proto (2), '91 Boarala 'cross, '93 Project 3, '88 Trofeo, '86 Volpe, '89 Axis, '79 Mixte SOLD, '99 Mega Pro XL Ti, '97 Ti Megatube, , '90 something Vento 603,

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  7. #7
    Senior Member Lascauxcaveman's Avatar
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    Quote Originally Posted by Bianchigirll View Post

    I actually find it odd that your chainwheel is worn but not the freewheel. how old or roughly how many miles on the chain?
    Yeah, that does sound kind of backwards. Maybe someone swapped in a more recent freewheel before the OP took possession of the bike.

    And don't go hatin' on the BioPace that way...
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    The Biopace I was looking at was actually a little than other pricier than other NOS components I was looking at. Anyway I'm interested in hearing criticisms of them because I have only read good things about them. So please let me know. As for the chainring/freewheel discrepancy, I have only had the bike 6 months, and do not know how many miles are on the components. But the chain is well stretched, and the original 52t ring looks worn, but the smaller one does not...I assume from significantly less use. Freewheel also seems leas worn so it very well may be newer than the other components.

  9. #9
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    Quote Originally Posted by xkjzix View Post
    The Biopace I was looking at was actually a little than other pricier than other NOS components I was looking at. Anyway I'm interested in hearing criticisms of them because I have only read good things about them. So please let me know. As for the chainring/freewheel discrepancy, I have only had the bike 6 months, and do not know how many miles are on the components. But the chain is well stretched, and the original 52t ring looks worn, but the smaller one does not...I assume from significantly less use. Freewheel also seems leas worn so it very well may be newer than the other components.
    A few things here.

    Shimano/Suntour compatibility has more to do between the shifters derailleur and freewheel/cassette. Generally speaking- it's about how much cable the shifters pull, how much that pulls the derailleur, and how much the derailleur is moving over the freewheel/cassette. Suntour and Shimano had different ratios. Some things work together, some don't. For the most part, the front rings aren't impacting much of what's taking place in the relationship of the shifters, derailleur and rear cogs- so it's not so much of an incompatitibility with that system.

    The BioPace stuff isn't bad, some people don't like it- some people think they don't like it. Solely based on that, I don't think I'd pay more for a part that plenty of people would give you for free.

    A "stretched" chain is bad. The "stretching" is actually wear on the chain.
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    Thanks for the info. I like the way my RD and freewheel work (I tinkered enough to get the indexing really smooth), I'll examine the freewheel closer when I return from travel, if it needs to be replaced, I'll definitely go with a NOS Suntour one. As far as getting the front ring for free, I don't know who would hook me up for free, but free is always better.

  11. #11
    Senior Member auchencrow's Avatar
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    Quote Originally Posted by xkjzix View Post
    Thanks for the info. I like the way my RD and freewheel work (I tinkered enough to get the indexing really smooth), I'll examine the freewheel closer when I return from travel, if it needs to be replaced, I'll definitely go with a NOS Suntour one. As far as getting the front ring for free, I don't know who would hook me up for free, but free is always better.
    Once you swap your FW for a new one, you will probably have to install a new chain as well, or the old one will ramp up on the cogs and skate under load. IME it's best to plan on replacing them together.
    - Auchen

  12. #12
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    Quote Originally Posted by auchencrow View Post
    Once you swap your FW for a new one, you will probably have to install a new chain as well, or the old one will ramp up on the cogs and skate under load. IME it's best to plan on replacing them together.
    Oh I definitely knew that one. Chain for sure is donezo.

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