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  1. #1
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    Thinking of buying new wheels. Cassette fitment question

    I believe my Specialized Sirrus has a SRAM 7 Speed cassette I believe PG730.

    Are all wheels that have a SRAM/Shimano hub compatible to fit a 7 speed cassette I would assume the spacers are wide enough but I want to double check if this is universal.

    Vice versa, if I wanted to outfit a new drivetrain can I keep my current wheel?

  2. #2
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    Nevermind I think I found my answer. I guess the free hub body on a 8/9 hub is bigger so I might need a spacer in the back of the cassette.

  3. #3
    Bikaholic blamp28's Avatar
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    You did find the answer. A new hub would most likely be 8-9-10 speed compatible and would work with a spacer for your 7 speed cassette. This would also allow you the option of upgrading to a different drive-train later if you want.
    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

  4. #4
    Constant tinkerer FastJake's Avatar
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    Yes, you found your answer. As long as you're sure that you have a cassette, and NOT a 7 speed freewheel. These are not the same and are not cross-compatible. http://www.sheldonbrown.com/free-k7.html
    Why "derailer" is the correct way to spell the gear-change mechanism: sheldonbrown.com/derailer.html

  5. #5
    Bikaholic blamp28's Avatar
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    Quote Originally Posted by FastJake View Post
    Yes, you found your answer. As long as you're sure that you have a cassette, and NOT a 7 speed freewheel. These are not the same and are not cross-compatible. http://www.sheldonbrown.com/free-k7.html
    +1 and remember that if you do have a freewheel now, you can switch to the cassette by simply buying the cassette and spacer with the new wheel.
    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

  6. #6
    Senior Member BCRider's Avatar
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    Quote Originally Posted by blamp28 View Post
    +1 and remember that if you do have a freewheel now, you can switch to the cassette by simply buying the cassette and spacer with the new wheel.
    Sorry, how's that again? You've mixed up references to freeWHEELS with cassetes and spacers. I'm guessing you intended to say freeHUB.
    Model airplanes are cool too!.....

  7. #7
    Bikaholic blamp28's Avatar
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    Quote Originally Posted by BCRider View Post
    Sorry, how's that again? You've mixed up references to freeWHEELS with cassettes and spacers. I'm guessing you intended to say freeHUB.
    The OP wants to buy a new rear wheel and understands that a spacer would be needed behind a 7 speed cassette. I'm only clarifying that if the OP does in fact own freewheel style wheel now and wishes to switch to a cassette style wheel when making this purchase, the only expense in addition to the wheel itself would be a cassette and spacer.
    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

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