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  1. #1
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    Can interchange Shimano 10 spd sprocket units?

    I would like a 14-27 ultegra 10 speed casette. Shimano does not offer one. I am thinking I will purchase the 14-25 and interchange the 21-23-25 sprocket unit with a 21-24-27 sprocket unit for a 12-27. Will this work?

    I am concerned for I notice Shimano has 3 different part numbers for a 21-23-25 sprocket unit dependant on the rest of the casette. In this case 12-25, 13-25, 14-25. Why aren't these interchangeable? Or are they?

  2. #2
    Senior Member
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    Quote Originally Posted by Steve J.
    I would like a 14-27 ultegra 10 speed casette. Shimano does not offer one. I am thinking I will purchase the 14-25 and interchange the 21-23-25 sprocket unit with a 21-24-27 sprocket unit for a 12-27. Will this work?

    I am concerned for I notice Shimano has 3 different part numbers for a 21-23-25 sprocket unit dependant on the rest of the casette. In this case 12-25, 13-25, 14-25. Why aren't these interchangeable? Or are they?
    I would expect that you can make the 14-27 work just fine. The difference in the 21-23-25 clusters is probably synchronization, and there may be a slight timing issue when shifting between the 21 and the next smaller cog, but in my experience with making custom 9-speed cassettes if synchronization isn't perfect it's hardly noticeable anyway. I say go for it.

    Al

  3. #3
    Elitist Troglodyte DMF's Avatar
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    Quote Originally Posted by Steve J.
    I am concerned for I notice Shimano has 3 different part numbers for a 21-23-25 sprocket unit dependant on the rest of the casette. In this case 12-25, 13-25, 14-25. Why aren't these interchangeable? Or are they?
    Another possible is the perversity of logistical numbering systems. Sometimes the identical part has a half dozen different numbers.
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  4. #4
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    I did this and have used all year. No problems ...... a great decision. I use all gears and can lock in a comfortable cadence quickly.

  5. #5
    The mods changed this... damocles1's Avatar
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    Should work fine...

    Here's the exploded .pdf file from Shimano...

    http://bike.shimano.com/media/techdo...9830608752.pdf

  6. #6
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    I expect the three different part numbers for the 21x27 cluster cover Dura Ace (Ti cogs) Ultegra (steel cogs but assembled on a spider) and 105 (complete flat plate cogs.) Any will work but the higher lines will be lighter and more expensive.

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