"Uh-uh. Respek Knuckles."
Join Date: Jun 2005
Bikes: '06 LeMond Versailles, '04 S&M Beringer, '03 Quamen Bowls, '68 Raleigh Grand Prix (converted to fixed gear)
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By crossing more spokes, the spokes become closer to tangent with the hub flange, which means less vertical stress on the flange. It doesn't necessarily mean the wheel is any stiffer or handles 'windup' any better. I'm not sure if this applies to 28h wheels or if a couple more spokes need to be lost but here's my guess as to what she was explaining:
At certain points as spoke count decreases and distance between them on the rim increases, the number of spokes one *can* cross to place the spokes at proper angles to the hub flange will decrease. For example, on a 48h wheel you cross 4 spokes to get the same spoke angle on the hub as you would with 2x on a 24h wheel. If you cross too many spokes and the angle is too close to tangent (say you tried 4x on a 24h wheel), the spokes don't clear each other at the bend. No good.