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Why asymmetric carbon MTB rims

Asymmetrical rims build up into stiffer, stronger and more reliable wheels by improving the bracing angles of a dished wheel and equalizing the spoke tensions between the drive and non-drive side spokes. On a mountain bike wheelset with disc brakes, both the front and rear wheels have significant dish. With traditional rims, the rim is centered (or dished) by decreasing spoke tension on one side relative to the other so that the rim is pulled into center. A typical symmetric-rimmed mountain bike rear wheel requires spoke tension ~40% less on the non-drive side. This mismatch in spoke tension means the wheels is weaker than it could be, the lateral stiffness could be improved, and the low-tension spokes are prone to coming loose over time. Asymmetrical rims help fix these issues by offsetting the nipple holes so that the bracing angles are improved and the spoke tension between the drive and non-drive side is more equalized.
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