The adaptable bb386evo 30mm spindle will fit a wide variety of frames with a range of bb standards the sl k light uses fsas asymmetric bolt standard with four bolts at 90 degrees to one another and a fifth behind the crankarm adding support where its needed choose from the traditional 5339 chainring combination 5034 compact or 5236 semi compact the unidirectional carbon finish updated graphics and concealed chainring bolts make the sl k light look as fast as it is