Originally Posted by
davidad
According to the Mavic website the ERD is 600mm.
Use double butted spokes. They make for a stronger wheel.
What hub are you using?
Don't ever bother looking up erds online, they vary enough to be useless. I don't even trust the ERD from different batches of the same rim i've measured _myself_. Measure erd for the specific rim you're holding in your hands that you're about to build.