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Ceramic braking surfaces in a nice silver finish! Light and low profile, the M231 was one of the most popular ATB rims of its day. Great for all around cross country use, well aligned but pinned rim seam, double wall, single eyelet. Silver anodized finish, with ceramic braking surfaces. 23mm wide (external) 548mm ERD. 440g. Drilled for schrader valves. See spoke hole drilling options below.