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Old 05-26-11, 01:55 PM   #1
pixelharmony
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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?
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Old 05-26-11, 02:02 PM   #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.
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Old 05-26-11, 02:19 PM   #3
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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.
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Old 05-26-11, 03:43 PM   #4
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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
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Old 05-26-11, 07:47 PM   #5
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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
+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.
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Old 05-26-11, 08:14 PM   #6
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+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.
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Old 05-26-11, 08:42 PM   #7
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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.
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