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Do you have any pictures of the disc brake hub (and drag numbers...)?
and why not stay at 20 spokes for disc but upgrade to dt swiss new aero spokes (1.1x3.3mm). There should be the same drag for cx-ray and them (better aspect ratio but slightly thicker).
svenhöek-
why not stay at 20 spokes for disc
Because a 20H disc hub would never work. Oh, hang on...
http://www.wheelsmith.co.uk/product-page/wheelsmith-20h-front-6-bolt-disc-hub-quick-release-onlyI'm a bit surprised that a narrow 20H hub is an improvement over a wide 16H hub, and it wouldn't even need to be full width with that rim depth considering how reliable my Shimano RS30s have been with 16 spokes of 3.0×0.9 cross section.
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We didn’t want to mix and match spokes and so stuck with Sapim. Number of spokes isn’t as important as where they’re placed in the airflow we found
gbj_tester
xavierdisley
Someone will try to copy it I'm sure :D