Wouter,

Thanks for the off-center load carrying description. It makes sense.

My experience with Ronstan 19mm track has been in a self-tacking jib traveller. These cars will stick slightly under their own weight when used horizontally with no jib sheet load, such as when tacking in light air. Sometimes we have to hand-move the car to complete tacks in these conditions... but that might be a good thing, as a better rolling car might tend to roll to the track center under its own weight. :-)

Thanks for the description,
--Glenn