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According to Zipp:
The asymmetrical flange design yields equal tension on both the drive side and non-drive side of the rear wheel. This completely eliminates torsional deflection through the hub shell providing immediate acceleration and flawless tracking through turns on the velodrome under power. To ensure consistent spoke tension and support for the spokes, the hub flanges of the 333 are angled inward to provide a direct path from a spoke’s j-bend straight to the rim.
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According to Zipp:
The asymmetrical flange design yields equal tension on both the drive side and non-drive side of the rear wheel. This completely eliminates torsional deflection through the hub shell providing immediate acceleration and flawless tracking through turns on the velodrome under power. To ensure consistent spoke tension and support for the spokes, the hub flanges of the 333 are angled inward to provide a direct path from a spoke’s j-bend straight to the rim.
zipp.com/technologies/hub/333-track-hubs.phpactually quite common in the MTB world when much more dishing is required.
I have never seen hubs like that, why is one side larger?