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  1. #1
    Join Date
    Jan 2009
    Location
    Dallas, TX
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    361

    very novice part swapping question...

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    Ok, I've only been cycling since last summer and this is my first attempt at minor upgrades on my bike and would like advice.

    I have a friend who upgraded his cassette and crank and gave me the parts he replaced. I have all 105 components on my bike except for a FSA crank. I would like to swap out his cassette with mine because it would give me an extra gear to help on the hills. His cassette is 12-27T and mine is 11-25T. They are both 105 cassettes so I don't forsee and issues with this.

    My question really more concerns my husband's bike. He has sora/tiagra mix on his bike. He wants to put my 105 11-25T cassette on his bike and a FSA Gossamer crank on his bike. The problem is that his bike is 9 speed. I am not sure that these new parts are compatible and if there will even be increased performance from these parts if he can use them. Any opinions?
    Last edited by abejita; 04-26-2010 at 06:39 AM.
    Mary
    ~Strong and content, I travel the open road.~



    http://www.the3day.org/goto/mary.aguirre

  2. #2
    Join Date
    Sep 2007
    Location
    Uncanny Valley
    Posts
    14,645
    Shimano steel freehubs are compatible with 8-, 9- and 10-speed cassettes, so that shouldn't be a problem.

    The reason for that is that the cogs are different widths. So a 10-speed cassette requires a 10-speed chain and a 10-speed shifter. I'm not 100% sure whether chainrings are also different widths.

    When you swap your cassettes, you may have to adjust the B-tension screw on your RD to keep the jockey wheel from contacting the 27T cog. (I did when I made the same swap.) Shimano has service and adjustment instructions for all their components on their website.
    Speed comes from what you put behind you. - Judi Ketteler

  3. #3
    Join Date
    Jan 2009
    Location
    Dallas, TX
    Posts
    361
    Ah, ok...so hubs will not be able to use the 10 sp cassette because he has 9 sp shifters?
    Mary
    ~Strong and content, I travel the open road.~



    http://www.the3day.org/goto/mary.aguirre

  4. #4
    Join Date
    Aug 2008
    Posts
    2,845
    the 9 speed shifters won't work with the 10 speed cassette - he can use the gossamer cranks no problem

  5. #5
    Join Date
    Jan 2009
    Location
    Dallas, TX
    Posts
    361
    Quote Originally Posted by OakLeaf View Post

    When you swap your cassettes, you may have to adjust the B-tension screw on your RD to keep the jockey wheel from contacting the 27T cog. (I did when I made the same swap.)
    Did you notice a difference when you went from you 25T to the 27T cog? Is it worth swapping them?
    Mary
    ~Strong and content, I travel the open road.~



    http://www.the3day.org/goto/mary.aguirre

  6. #6
    Join Date
    Sep 2007
    Location
    Uncanny Valley
    Posts
    14,645
    Those two teeth make all the difference in the world to me when the grade is over 15% or so.

    And he CAN use the hub, he CAN'T use 9-speed shifters with a 10-speed cassette.
    Speed comes from what you put behind you. - Judi Ketteler

  7. #7
    Join Date
    Jan 2009
    Location
    Dallas, TX
    Posts
    361
    Quote Originally Posted by OakLeaf View Post

    And he CAN use the hub, he CAN'T use 9-speed shifters with a 10-speed cassette.
    LOL, I always call my husband 'hubs'...there is not a new bike hub in the equation...sorry!
    Mary
    ~Strong and content, I travel the open road.~



    http://www.the3day.org/goto/mary.aguirre

  8. #8
    Join Date
    Sep 2006
    Location
    Oslo, Norway
    Posts
    4,083
    You can put an 8, 9 or 10-speed cassette on the same hub (wheel). They're the same width. But to fit more sprockets on the same width, each sprocket gets narrower and the distance between them gets less as you go from 8 to 9 to 10. Therefore you will need a specific 8, 9 or 10 speed chain to fit the sprockets.

    The rear derailleur doesn't care how many sprockets you have, it just moves as much as the shifter on the bars tells it to. The rear shifter, on your bars, does care. It's indexed to 8, 9 or 10, and if you want to swap your cassette to one with more sprockets you also have to swap your shifter.

    With my limited experience of road bikes, and if I have understood Sheldon Brown and my LBS correctly.
    Winter riding is much less about badassery and much more about bundle-uppery. - malkin

    1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
    2008 white Nakamura Summit Custom mtb/Terry Falcon X
    2000 Schwinn Fastback Comp road bike/Specialized Jett

  9. #9
    Join Date
    Apr 2006
    Location
    Maine
    Posts
    983

    Very novice part swapping

    Great advice everyone!

    If indeed you make the swap, the one thing that could also pop up is the wear on the new cassette vs your chain. If either have a fair amount of wear on them, you could get skipping/poor shifting as a result. So, if you find this happens, it easy to fix with a new chain.

 

 

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