• I don't really know myself either, but Sheldon says something about left or right drilling determining whether you start lacing from the first or second hole from the valve. I think it supposed to affect the spoke angles? I asked a wheelbuilder to check one of the wheels I laced last week, and he reckoned the angles were off because I should have started one hole further round because of the drilling. Its a mavic open sport I used, which the internets would have me believe is a left handed rim, but I can't see any pattern myself...

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