diff --git a/VectoCore/VectoCore/Models/Declaration/Axle.cs b/VectoCore/VectoCore/Models/Declaration/Axle.cs
index 371ac5231afec5f3457e2f0d002a6af3d337e41f..4ab3df706321a42fbdb6c710d7066147d4bade70 100644
--- a/VectoCore/VectoCore/Models/Declaration/Axle.cs
+++ b/VectoCore/VectoCore/Models/Declaration/Axle.cs
@@ -29,31 +29,46 @@
 *   Martin Rexeis, rexeis@ivt.tugraz.at, IVT, Graz University of Technology
 */
 
-using System.ComponentModel.DataAnnotations;
-using TUGraz.VectoCommon.Models;
-using TUGraz.VectoCommon.Utils;
-using TUGraz.VectoCore.Models.SimulationComponent.Data;
-
-namespace TUGraz.VectoCore.Models.Declaration
-{
-	public class Axle : SimulationComponentData
-	{
-		public string WheelsDimension { get; internal set; }
-
-		[Required, SIRange(0, 100)]
-		public KilogramSquareMeter Inertia { get; internal set; }
-
-		[Required, SIRange(0.003, 0.015)]
-		public double RollResistanceCoefficient { get; internal set; }
-
-		[Required, SIRange(500, 100000)]
-		public Newton TyreTestLoad { get; internal set; }
-
-		[Required, SIRange(0, 1, ExecutionMode.Engineering), SIRange(double.MinValue, 1, ExecutionMode.Declaration)]
-		public double AxleWeightShare { get; internal set; }
-
-		public bool TwinTyres { get; internal set; }
-
-		public AxleType AxleType { get; internal set; }
-	}
-}
\ No newline at end of file
+using System;
+using System.ComponentModel.DataAnnotations;
+using TUGraz.VectoCommon.Models;
+using TUGraz.VectoCommon.Utils;
+using TUGraz.VectoCore.Models.SimulationComponent.Data;
+
+namespace TUGraz.VectoCore.Models.Declaration
+{
+	[CustomValidation(typeof(Axle), "ValidateAxleData")]
+	public class Axle : SimulationComponentData
+	{
+		public string WheelsDimension { get; internal set; }
+
+		[Required, SIRange(0, 100)]
+		public KilogramSquareMeter Inertia { get; internal set; }
+
+		[Required, SIRange(0.003, 0.015)]
+		public double RollResistanceCoefficient { get; internal set; }
+
+		[Required, SIRange(500, 100000)]
+		public Newton TyreTestLoad { get; internal set; }
+
+		[Required, SIRange(0, 1, ExecutionMode.Engineering), SIRange(double.MinValue, 1, ExecutionMode.Declaration)]
+		public double AxleWeightShare { get; internal set; }
+
+		public bool TwinTyres { get; internal set; }
+
+		public AxleType AxleType { get; internal set; }
+
+		public static ValidationResult ValidateAxleData(Axle axle, ValidationContext validationContext)
+		{
+			var execMode = GetExecutionMode(validationContext);
+			if (execMode == ExecutionMode.Engineering)
+				return ValidationResult.Success;
+			try {
+				DeclarationData.Wheels.Lookup(axle.WheelsDimension);
+			} catch (Exception) {
+				return new ValidationResult(string.Format("Unknown Tyre dimenstion '{0}'", axle.WheelsDimension));
+			}
+			return ValidationResult.Success;
+		}
+	}
+}