Assymmetric (offset) Rims
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Well, it’s all about equalising spoke tension.
By offsetting the rim, the nipple holes are placed more directly in line with the centre of the hub, which allows a more even spoke length, and therefore tension of spokes between both sides of the wheel.
(It also improves the bracing angle of a dished wheel)
This is one of the reasons wheels are cross-laced.
The rim asymmetry enables an entire wheelset to be built, with almost uniform spoke tension.
This results in a stiffer and more stable wheelset, which is under less strain ( similar to the Evo boost idea).