This chainset has been designed & refined to ensure maximum levels of power-transfer from rider to road are maintained. Thanks to modern technology, Shimano has designed this crankset with the perfect gear-pitch so it performs exceptionally with standard road frames (130mm rear dropout spacing) & modern disc brake frames, which have a wider 135mm dropout spacing & wider chainline. This design pushes the advancements of road chainset performance & achieves exceptional levels of efficiency & comfort.