Mountain, Road, and Gravel rims.
29'r x 30i and 40i wide
27.5"/650b x 25i, 35i and 45i wide
26" x 35i wide
700c x 22i and 23i wide
Before derby rims, wide aluminum rims added at least 1/2 to 3/4 lbs in rolling weight. Heavier rims are slower to accelerate, slower climbing, slower handling. Added wheel weight bounces more, reducing traction, especially at faster speeds.
But now derby rims, the world's first carbon fiber wide rims, are stronger, stiffer, lighter.
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Wide rims build into strong and stiff wheels. Also optimize tire performance, for more stable handling and much increased traction and control.