The aluminium and plastic CHAINBOW fully encases the chainset for superior protection. CHAINBOW BLACK 38 TEETH (SKCBW38B) This version is suitable for hub gears, with a maximum chainring diameter of 158mm, maximum 38 teeth. CHAINBOW BLACK 44 TEETH (SKCBW44B) This version is suitable for hub gears or derailleur gears, where the chainset has a chainguard ring already in place. Maximum chainring diameter of 175mm, maximum 42-44 teeth. CHAINBOW BLACK 48 TEETH (SKCBW48B) This version is suitable for hub gears or derailleur gears, where the chainset has a chainguard ring already in place. Maximum chainring diameter 199mm, maximum 46-48 teeth.