FSA Vero Triple Crank Set Square Taper 50t /39t /30t Alloy Road Bike Touring Bicycle 172.5mm 170mm FSA Quality with Aluminum Alloy Arms and Steel Chain Rings Comes With Crank Bolts 50 tooth outer , 39 tooth Center, 30 tooth inner chain rings Replacebale Chain Rings 130mm Bolt Circle Diameter Threaded for 9/16 Pedals