In Tube and Pipe Styles, the minimum bend radius for a particular style can be set under the rules tab. When using flexible hoses (in my case hydraulic hose) this value can be set as normal. If you right click and check the bend radius in the model tree, Inventor will inform you if there is a violation of the specified minimum bend radius, but that is all.
It would be great if, while you are creating the route, Inventor would not allow the radius to be smaller than that specified in the style.
I have searched for a solution to this on the forums but have only found that it is not a feature that exists.
Thanks for listening.