The XM 321 from Mavic the mainstay of the "cross-mountain" series. Replacing the older F219 model, it is a 28mm wide rim (outside to outside) for use with disc brakes only. At 570 grams, it's designed with an eye on durability and strength for aggressive riders. It all comes at a price that won't ding your wallet, making these rims ideal for your next custom disc-specific wheelset. Presta only.
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