Friction Drive Encounters Oil
Water is bad enough for a friction drive. In my case, the engine revs up every time I cross a wet spot (not a puddle, just a wet spot). But an even worse problem is oil on the pavement. I'm working ways to deal with it. I suppose just washing the tire & roller in detergent?
In the end, if oily pavement is unavoidable, a FD isn't practical.