Product Description The Shimano Tiagra 10-speed Chainring for the FC-4703 crank This Shimano 10-speed chainring is only compatible with the Tiagra FC-4703 triple crankset and can be combined with a 30-39-50 gradation. The bolt circle diameter is 74 or 110 mm with asymmetrical hole distribution. The 30-tooth version is made of steel, the large chainrings are made of aluminium or an aluminium-plastic composite. Specifications:Application:Road, CityMount:110/74 mm bolt circle diameter, 4-arm asymmetricalTeeth:30 t, 39 t, 50 tGearing:3x10-speedTechnical Information:Combinations:30-39-50 tMaterial:steel (30 t), aluminium (39 t), aluminium/composite (GFRP 50 t)Compatibility:Tiagra FC-4703Features:large and middle chainring anodised, small chainring platedModels:30 tooth: Type:MMBolt Circle Diameter:74 mmManufacturer Number:Y-1RD30000 39 tooth: Type:MMBolt Circle Diameter:110 mmManufacturer Number:Y-1RD98020 50 tooth: Type:MMBolt Circle Diameter:110 mmManufacturer Number:Y-1RD98030Note to Type Designation:The type designation (one or two characters) helps identify the compatibility of various chainrings with other chainrings. Because the larger chainrings have specially-formed teeth and upward shifting assistance, only particular smaller chainrings will match to ensure proper shifting performance. An XY chainring should only be combined with another XY chainring. This applies to all other types as well. Contents:1 x Shimano Tiagra FC-4703 chainring Manufacturer: Shimano Europe B.V. High Tech Campus 92 5656 AG Eindhoven Netherlands info@shimano-eu.com