Product Description You can combine the s with one chainring or with two chainrings. Specifications:Application:Road, Triathlon & Time Trial, CyclocrossCompatibility:1x, 2xChainring Mount:Cinch Direct MountTechnical Information:Crank Arm Material:CarbonAxle Material:AluminiumCrank Arm Length:170.0 mm, 172.5 mm, 175 mmChainline:dependent on chainringAxle Diameter:30 mmCompatible BSA Shell Width:68 mm, 86 mmContents:1 x s Manufacturer: FOX Factory GmbH Gewerbepark 6 66989 Höhfröschen Germany info@ridefox.com