Racers responsiveness and lightweight performance with a smoother deeper rim the ksyrium pro exalith sl is a lighter and stiffer version of ksyrium pro exalith it pushes weight saving one step further making it a high performance choice for any kind of ride like the pro exalith this wheel features the same fore technology and zicral spokes that bring higher stiffness and strength at a very low weight so why does tracomp make such a difference well a traditional wheel works with spokes