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I was talking about rim braked 700 c rims.
I have yet to find a rim of that weight that doesn't need rim washers/low tension/high spoke count and a lot of luck to stay together.
In fact I have stories of rims just over 400 grams cracking, but I prefer not to go on a tangent and be cursed forever for that...
390g is prefectly adequate rim weight...
If it's a 32 or 36 hole 26" Mavic XC717Disc.