Hi,

The radial and polar series use a fixed aspect ratio for the viewport. Increasing one dimension of the chart only does not allow for the area available to the radial/polar series to grow. You have a few avenues available to you, though. First, you can adjust the values of LabelSettings.Extent (to provide an adjusted distance that the labels should be to the outer ring of the chart, including overlapping them into the inner region) and NumericRadiusAxis.RadiusExtendScale (to make the overall percentage that the radial chart takes up within the viewport less so that it leaves more bleed over room for the labels) Here's an example that shows this strategy:

https://gist.github.com/gmurray81/7cde8dbae26e27b177da

	<igChart:XamDataChart x:Name="chart"
                              VerticalZoomable="True"
                              HorizontalZoomable="True" >
            <igChart:XamDataChart.Axes>
                <igChart:CategoryAngleAxis x:Name="angleAxis"
                                       
                                       ItemsSource="{StaticResource data}"
                                       Label="{}{Label}" >
                    <igChart:CategoryAngleAxis.LabelSettings>
                        <igChart:AxisLabelSettings
                            Extent="15" />
                    </igChart:CategoryAngleAxis.LabelSettings>
                </igChart:CategoryAngleAxis>
                <igChart:NumericRadiusAxis x:Name="valueAxis" RadiusExtentScale=".5" />
            </igChart:XamDataChart.Axes>
            
            <igChart:XamDataChart.Series>
                <igChart:RadialLineSeries x:Name="line"
                                      ItemsSource="{StaticResource data}"
                                      ValueMemberPath="Value"
                                      AngleAxis="{Binding ElementName=angleAxis}"
                                      ValueAxis="{Binding ElementName=valueAxis}" />
            </igChart:XamDataChart.Series>
        </igChart:XamDataChart>

Hope this helps!

-Graham

Currently those are your only two handles on adjusting the positioning of the labels on this chart type. We could add the ability to disable plot area clipping to the chart, but this would be a feature request at http://ideas.infragistics.com

Also, disabling the plot area clipping only really helps you for labels that spill out to the left and right. Not to the top and bottom of the plot area, unless you add extra padding around the plot area. The mechanisms I mentioned already are meant to be sufficient to keep the labels in view. Could you maybe insert a line break into the extra long labels as an alternative?

-Graham