I personaly would meassure the distance between your RHS drop out to the center of the cog, lets call thaT X and your over locknut messurment lets call that Y then you chainline will = (Y/2)-X
@TheBrick(Tommy) started
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I personaly would meassure the distance between your RHS drop out to the center of the cog, lets call thaT X and your over locknut messurment lets call that Y then you chainline will = (Y/2)-X