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DIY bike repair

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  • 13-06-2008 12:14pm
    #1
    youcancallmeal
    Registered Users Posts: 8,018 ✭✭✭


    I've been a cyclist for fairly long time and I can do most of the basics of bike repair but I'm at a loss when it comes to gears/cassettes? I have an old bike and I want to change the rear wheel on it because a lot of spokes are broken and it is buckled, I found another old rear wheel which is in good condition and I want to replace it with that. The problem is the current wheel has a 7 speed cassette and the wheel I want to put on it has a 6 speed cassette. Would it possible to take the cassette of one and put it on the other or is that just going to cause me problems? Also I vaguely remember reading somewhere before that you need a special tool to remove cassettes, is this true?


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    #2
    penexpers
    Closed Accounts Posts: 4,038 ✭✭✭penexpers


    Should be possible. You might need to mess around with the spacers to get the 7 speed onto the 6 speed cassette.

    You need two tools for this - a cassette lock tool and a chain whip tool. The chain whip is pretty standard but the cassette tool will be specific to the cassette.


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    #3
    kenmc
    Registered Users Posts: 7,276 ✭✭✭kenmc


    Would it possible to take the cassette of one and put it on the other or is that just going to cause me problems?
    . Maybe it's possible, but it is also possibly not do-able. a 6 or 7 cassette is *probably* a threaded hub rather than a splined hub like is used now in 8/9/10/(11!) cassettes, although it's also possible that one is threaded the other is splined.
    Another issue is that the 6 speed wheel will have less dishing than the 7 speed, so there might not be the room to put the 7 speed block on the 6 speed wheel and still have it fit inside the frame. These are all hypotethical issues that may or not actually cause problems depending on the exact combination of factors.
    Also I vaguely remember reading somewhere before that you need a special tool to remove cassettes, is this true?
    Yes, you need 2 - a chain whip and a cassette extraction tool, which is a splined nut which goes into the block to unscrew it from the hub.


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    #4
    Gavin
    Registered Users Posts: 4,676 ✭✭✭Gavin


    If it's an older cassette as the 6 one probably is, you might not need the hain whip, it could just be a screw on cassette. You'll need the correct cassette tool. Go into a bike shop with the wheel and ask for the right one that will fit.

    They might even take the cassette off for you if you ask nicely. Those screw-on cassettes are torturous to remove, they are tightened by the cycling motion, so can be tiiiiight !

    Gav


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    #5
    youcancallmeal
    Registered Users Posts: 8,018 ✭✭✭youcancallmeal


    Hmm this sounds a lot harder than I thought it would. Would it maybe be easier to try and replace the broken spokes and straighten up the wheel at the same time?


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