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Vision do a 35mm rim with 21 up front
21 spokes suggests 14 on the disc side and 7 on the other side, which is nearly as good as having 28 spokes.
You can make 20 spoke disc brake wheels, but it's not really worth the effort. If you're not racing, you might as well use 32 spokes, because the performance gain from using 24 is tiny but the durability gain from using 32 is huge.
gbj_tester-
the performance gain from using 24 is tiny but the durability gain from using 32 is huge
But the vast majority of broken spokes I've come across have fatigued from low tension. If the rim is strong enough in the nipple bed for low spoke counts, IMO&E you get a more durable wheel with fewer spokes, for the same counterintuitive reason that skinnier spokes build more durable wheels: it prevents spokes going slack.
That reasoning also says that triplet lacing is probably better on a dished wheel. And when considering front braking load, which will certainly exceed driving load on the rear, triplet lacing makes a lot better use of the spokes compared to standard semi-radial.
I reckon 21h is a pretty good number for front and rear, for medium strength rims (carbon, or at least a pound of ally), under a medium weight rider, on an unloaded bike.
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You can make 20 spoke disc brake wheels
I was wondering where you'd find the hubs.
Kimmo
I’ve seen Vision do a 35mm rim with 21 up front, does the additional rim depth help? Or is it still better to go for a higher number