How to make wheel rotate on a flat surface?

Hello, I am a beginner in Solidworks and I have two instances where I would like to have a wheel travel along a surface.

Case #1 a wheel along a spline and a straight line over a rectangular block

 

Case #2 

a V-groove wheel over an L-angle surface

 

Please see attached assemblies. Please advise what mates should be used to have these freely rotate. Any help is greatly appreciated.