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    Largest rear sprocket for ST4
    #1
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    I am going to be running a 600RR engine in my ST4 and I want to get the best mechanical advantage available. I have already bought an 11t front sprocket, but now I am looking at the rear. I have found some conflicting info as to the largest you can go. I will be running a 520 chain and the sprocket hub design is wide open, but I am curious on how big you can go without extensively modifying the rear cradle. I don't want to keep buying and returning sprockets if I can avoid it. Also where is a good source for these larger sprockets?

    Thanks!
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    Re: Largest rear sprocket for ST4
    #2
    Millenium Member
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    How much room ya got? I'd shoot for a 60t which is right at 12" diameter, and bump the front to a 12t for a 5:1 ratio.
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    Re: Largest rear sprocket for ST4
    #3
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    Who sells a good one?
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    Re: Largest rear sprocket for ST4
    #4
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    I have a 55 tooth on mine and I can't go any bigger because my diff cradle has to slide for chain tension. I'd imagine if you stuck to the plans a 60 tooth would be the absolute biggest, but you may even be needing to grind away the suspension cross bars some for it to work.
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    Re: Largest rear sprocket for ST4
    #5
    Keeper of the Asylum K-fab's Avatar
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    SuperSprox is the way to go. They're tough, have minimal wear and they'll make custom sprockets if needed too.
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    Re: Largest rear sprocket for ST4
    #6
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    Quote Originally Posted by K-fab View Post
    SuperSprox is the way to go. They're tough, have minimal wear and they'll make custom sprockets if needed too.
    Awesome! Thanks!
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