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  1. #1
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    Chain ring or cassette change over?

    Hi all.I just purchased a 2012 Marin Lucas Valley,my first brand new bike for myself.The unit comes with 52/42/30 and 11-26 cassette.I would like to have a little more hill climbing capability for the hills out here in British Columbia,Canada.This would come in handy especially when I am thinking about doing some touring.Any suggestions?
    Happy to be a new member to the forum,thank you.

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    Not knowing which Tiagra rear derailleur came on your bike, it's hard to say. You can can use up to 31T as the largest gear on the rear if you have the short cage RD. If you have the long cage, it can go bigger.
    Last edited by jsdavis; 06-04-12 at 08:31 PM.

  3. #3
    His Brain is Gone! Tom Bombadil's Avatar
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    If you have the newest Shimano Tiagra RD, then they now offer a Tiagra-level 12-30T rear cassette.

    If it happens to be their previous model, then it can be problematic to go over 11-28T. I've known of people who have had a lot of problems when trying to use a 30T on the old version.
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  4. #4
    Senior Member Seve's Avatar
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    Quote Originally Posted by als20 View Post
    Hi all.I just purchased a 2012 Marin Lucas Valley,my first brand new bike for myself.The unit comes with 52/42/30 and 11-26 cassette.I would like to have a little more hill climbing capability for the hills out here in British Columbia,Canada.This would come in handy especially when I am thinking about doing some touring.Any suggestions?
    Happy to be a new member to the forum,thank you.
    As already mentioned, if you post the model of derailleur you will get more detailed assistance.
    If it's a RD-4500 with a short cage, 31 would be the largest, with a long cage the limit is 37. (You can check Shimano's web site for the exact specs once you know the model No. etc.) http://bike.shimano.com/publish/cont...-.rd_road.html

  5. #5
    Igo
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    Quote Originally Posted by als20 View Post
    Hi all.I just purchased a 2012 Marin Lucas Valley,my first brand new bike for myself.The unit comes with 52/42/30 and 11-26 cassette.I would like to have a little more hill climbing capability for the hills out here in British Columbia,Canada.This would come in handy especially when I am thinking about doing some touring.Any suggestions?
    Happy to be a new member to the forum,thank you.
    The Shimano web site shows a 9 speed 11-30 Tiagra cassette that should make your bike pull like a D9 Cat. New version Tiagra only.
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    Thank you all for your input.I now have an idea where to concentrate on.

  7. #7
    His Brain is Gone! Tom Bombadil's Avatar
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    Quote Originally Posted by Seve View Post
    As already mentioned, if you post the model of derailleur you will get more detailed assistance.
    If it's a RD-4500 with a short cage, 31 would be the largest, with a long cage the limit is 37. (You can check Shimano's web site for the exact specs once you know the model No. etc.) http://bike.shimano.com/publish/cont...-.rd_road.html
    You are misreading their specs. That link states their maximum rear cog size is 27T. The "Total Capacity 37T" spec means what the total range is when both the front and rear ranges are added. That is, if you have front triple 50/39/30 that is 20, then the rear max difference would be 17, for a total of 37.

    According to Shimano, the old version Tiagra has a supported max rear cog size of 27. Although many people have reported they have used 28T and 29T cogs successfully, however some have said it can be balky with a 29.

    The new version Tiagra supports a rear cog size of up to 30T.
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