The legacy wheel of the ksyrium family now gets ism 4d rims and a stepped up finish quality to make it even fasterthe ksyrium pro sl is the result of over 15 years wheel developmentbreaking the moldwhen it was first introduced in 1999 ksyrium totally broke the mold of wheel build 40traditionally 32 thin steel spokes with tiny nipples traditional drilling and lacing41 it drastically improved the ride quality of a wheel and a new generation of wheel system was born that would set the indu