20" CHAMBER - Features: Unique chambered sidewall design increases strength and lower pinch-flats and sidewall issues. We have offset spoke pattern. Extruded from 6061 Aluminum. - Welded seam. - Includes Stolen PVC rim strip. - Bead diameter: 406mm. - Width: 36mm. - Seam: Welded. - Sidewall height: 17mm. - Holes: 36H. - Valve: Schrader. - Colors: Matte Black, or Polished. - Weight: 18.5oz. / 524g.