Wheelset bike wheel system uses racing bike triathlon size 28 inches size etrto 622 x 15 series mavic r sys weight 1 390 g tyres clincher brake mount rim brake spoke type circular hubs 16 20 spoke materials carbon aluminium mavic zicral einbauma der hinterradnabe 9 5 x 130 mm fitting dimensions front wheel 9 x 100 mm lacings radial front radial rear two cross rear rim joint welded rim flange parallel type of bearing industrial tech