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Manufacturers are the worst for measurements, if they do supply them they are never right!
Even with sites like SJS that say they've measured stuff themselves I don't trust it. You can see them discussing discrepancies with manufacturer spec in the Q&A on this rim, https://www.sjscycles.co.uk/rims-tape/sun-cr18-16-x-1-38-349-abt-alloy-rim-silver-36-hole/ - yet I measured the rim myself and got a different result, which I then used to calculate spoke length and the wheel built up perfectly, proving their measurement was wrong.
I think items get revised or the machinery that's making it gets adjusted or the actual manufacturer changes so frequently that measuring stuff yourself is the only way to be sure.
yes i am, i thought they'd be some factory specs and ifo on an official website but i cant find any information at all about VIA hubs.
Time to get the callipers out again