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  1. #1
    Senior Member shakadude's Avatar
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    Convert downtube to STI

    Hi all,

    Is is possible to convert a shimano seven speed downtube shifters to STI? I know the older STI shifters aren't that good. Can the 9 speed shifter be made to work with a seven speed cassette?
    Aloha Mr. Hand

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    Senior Member barba's Avatar
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    7 speed Sora STI would be a great choice.

  3. #3
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    Older Shimano 7-speed RSX were good and functional shiftrer with decent reliability. Sora shifters are a less convenient design but work ok.

    9-speed shifters won't work with a 7-speed cassette since the cog spacing is different. One work-around is to install 8 cogs of a 9-speed cassette on a 7-speed freehub and lock out one click with the limit screws. That gives you compatible 9-speed spacing, lets you use your 7-speed hubs and adds one more cog to your choices.

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    cab horn
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    Quote Originally Posted by shakadude
    Hi all,

    Is is possible to convert a shimano seven speed downtube shifters to STI? I know the older STI shifters aren't that good. Can the 9 speed shifter be made to work with a seven speed cassette?
    Yes, they have sora 7 speed STI still available everywhere.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  5. #5
    Year-round cyclist
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    See this page

    In practice, since 7 speed and 8 speed spacing are very similar, you could use a 9-speed shifter with your 7-speed cassette if you install the cable according to the alternate cable routing (see link above).

    Or build your own 8-speeds-out-of-9 cassette. (see this)
    Michel Gagnon
    Montréal (Québec, Canada)

  6. #6
    59'er Mariner Fan's Avatar
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    Wouldn't it be alot easier to just put a nine speed wheel on the back? If your riding a seven speed I'm guessing you have 126 rear spacing and spreading to 130 would not be that hard.

  7. #7
    The quieter you become... Falkon's Avatar
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    if the bike is steel, this is true. Unfortunately, aluminum will weaken if spread even that much. I say pick up a shimano 8-speed cassette and older 8-speed shifters. That's what I plan to do on my commuter once I wear out the wheels.
    Quote Originally Posted by TechKnowGN
    San Jose has to be the most boring place I've ever been. And I live in Ohio.

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