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  • if you want the high flange, this comes as solid or slotted (in phil's case they call it slr, this is more for weight reduction). the preference is high flange, supposedly stronger and stiffer. it's your choice
    low flange
    high flange

    fixed/fixed you get two threaded sides (for a fixed cog)
    fixed/free you get one side for a freewheel cog
    fixed single means only one side is threaded

    the other option you have is the spacing (OLN), check your rear spacing 120mm, 126mm or 130mm?

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