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  1. #1
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    chain/cassette differences

    hey all,
    i have a cheap road bike thats rear wheel is completely unusable. i bought a new wheal and cassette for it, and one of the gears on the cassette broke. So i went to my local bike shop and bought a new cassette, there they told me a lot of things that i dont quite understand and want to make sure i do before i install this new cassette.

    the chain thats on there now came with the bike and what was on that was a 7 gear freewheel, along with a shimano index system rear derailer. now this cassette im putting on is a 9 speed shimano.
    I dont quite understand all the differences between chain and stuff so i just want to know if it will ruin anything? or do i need a new chain and derailer. just dont want to brake anything else.. thanks

  2. #2
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    so your going to replace a 7-speed freewheel with a 9-speed cassette...

    maybe try going back to the lbs and telling them you have no idea what you are doing and ask them to point you in the wrong directiong. there is a HUGE difference between 7 speed components and 9 speed.

    You should have bought a wheel that is meant for a 7-speed freewheel, along with the 7-speed freewheel. Thats really the only way your going to make it work.

  3. #3
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    well i bought the wheel online and do need to replace the chain on my bike sometime soon anyway. so beyond that, do i need a new deraileur?

  4. #4
    Senior Member SweetLou's Avatar
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    Quote Originally Posted by nymtber View Post
    so your going to replace a 7-speed freewheel with a 9-speed cassette...

    maybe try going back to the lbs and telling them you have no idea what you are doing and ask them to point you in the wrong directiong. there is a HUGE difference between 7 speed components and 9 speed.

    You should have bought a wheel that is meant for a 7-speed freewheel, along with the 7-speed freewheel. Thats really the only way your going to make it work.
    Uhm, no. If the rear shifter is a friction type, that shouldn't be a problem. The chain will need to be replaced with a 9 or 10 speed chain.

  5. #5
    Senior Member barba's Avatar
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    Hi peacemac. What kind of bike do you have?

    I think you are a little confused and should probably just take the bike into the shop and ask for advice. The main problem that you have is that your shifters are made for 7 speeds, and will not shift correctly for a 9 speed cassette. The derailleur isn't really the issue. You should also check to make sure that the rear wheel is actually compatible with a cassette (i.e. not made for a thread on freewheel) and that it will accept a 9 speed cassette.

  6. #6
    that bike nut BikingGrad80's Avatar
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    From what I gather you had a 7 speed freewheel on an old wheel. You replaced in with a newer wheel with a 9 speed freehub/cassette wheel. Problems:
    1. Will the wider wheel fit in your bikes dropouts. The old wheel was probably 126mm wide the new one 130. If it's steel you may need the dropouts spread. If aluminum you're probably out of luck.
    2. you need a narrower chain.
    3. Your shifters, if indexed, have 7 clicks spaced for 7 gears in the back. Though if you can live with friction this will be fine. Otherwise a pair of 9 speed barcons or Down tube shifters will run ~$70

  7. #7
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    hey thanks for all the replies. i do understand most of what im doing with the bike, but this confused me.

    Now yes the new wheel fits just fine on the bike and i dont have the indexed sift levers, i have some old school shifters from and old road bike. so it looks like all i need is a 9 speed chain. This is great because the old one has a good 3,000-4,000 miles/1.25 years so i need a new one anyway.
    thanks for all your help!

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