Both are incorrect. The correct ERD to use is 535. Mavic uses a measurement called "spoke support diameter", it's essentially 3mm off of the more commonly used ERD measurements that other rims use. They list the SSD number as 532, so ERD for spoke calc is 535.
most spoke calculators will give you the correct spoke length for shorter nips. if you use the suggested 16mm nips (mavic suggests them for clearance when used with UST rims) you will need to subtract 4mm.
I have the mavic XM819 Disc also. I used 534mm ERD at prowheelbuilder dot com to calculate my spokes with a Hadley 32 hole 3 cross front hub. I got 260mm spokes and 12mm nipples for both sides but after putting the nipples on so no thread show and the rims inserts tight the spokes seem really loose to me.
Has any one else built this rim/hub combo and remember the spoke length?
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