Shimano dura ace 9100 c24 clincher front wheelthe shimano dura ace 9100 c24 clincher front wheel is designed to meet professional road racing criteria low rim weight is achieved by reducing the alloy wall thickness from 13mm down to 07mm then a patented phosphoric acid anodising process is used to bond the carbon fibre to the alloy giving an excellent combination of low weight strength and rigidity features full carbonalloy 21mm deep 20 8mm wide rim carbon reinforced spoke eyelets alloy