Product Description The Vento chainring from TA is compatible with standard Campagnolo 9- and 10-speed cranks. Specifications:Application:RoadAttachment:135 mm bolt circle diameter, 5-armTeeth:46 T, 48 T, 50 T, 52 T, 53 T, 54 T, 55 T, 57 TGearing:2x9-speed, 2x10-speedTechnical Information:Material:aluminium (7075-T6)Compatibility:Campagnolo and Fulcrum cranks with 135 mm standard bolt circle diameterPosition: externalFeatures:hole spacing 80 mmblack or anodised silverdesigned and produced in France Note:The manufacturer recommends a difference between 12 and 16 teeth between the two chainrings.Manufacturer Numbers:silver 46 tooth:PL-50135302-46black 46 tooth:PL-50135309-46silver 48 tooth:PL-50135302-48black 48 tooth:PL-50135309-48silver 50 tooth:PL-50135302-50black 50 tooth:PL-50135309-50silver 52 tooth:PL-50135302-52black 52 tooth:PL-50135309-52silver 53 tooth:PL-50135302-53black 53 tooth:PL-50135309-53silver 54 tooth:PL-50135302-54silver 55 tooth:PL-50135302-55silver 57 tooth:PL-50135302-57Contents:1 x TA Vento chainring Manufacturer: Spécialités T.A. 41 bis rue de Laon 02150 Sissonne France france@specialites-ta.com