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Just can’t get my head round it, not doubting you, just it’s something I struggle to comprehend.
Anyway, got s bit of a ride in en route to work today and didn’t hear a peep out of the wheel. Put a half a turn on each nipple at work (Id usually go round a wheel after it’s first ride and tweak it up a bit) but no truing needed.
M_V
For the same reason that radial on the drive side rear should not be a thing. The load path is slightly different between disc brakes and rim brakes, but the actual external loads are the same and they get from the tyre contact patch to rider via the spokes either way.
Think about a rim brake for a while; the ground pushes the bottom of the rim upwards and backwards, the caliper pushes the top of the rim backwards (and downwards a bit, as it isn't usually right at the top), and the fork ends push the hub forwards and downwards. All the vectors have to sum to zero at equilibrium. To a first order approximation, the hub is pushed forward by twice the horizontal force at the tyre contact patch and downward by the vertical reaction force at the tyre contact patch. Somehow, all these forces get from the rim to the hub. That somehow is called spokes.