I have had these on 20 inch rims for 5000 miles..and am very impressed. They grip very well..very secure in turns etc, great over small and large bumps. I also had them through the New England winter this crazy year, and just for fun after 1 foot snowfalls i would go out driving. Not sure what the guy above is talking about, but i ran these though unplowed roads, up hills etc. and through 1 foot plus of snow. The thing will go through anything. The Mercedes 4matic is pretty advanced, yes, but the tire certainly did its job as well from my perspective. Was not sure what to expect with this tire, but am happy with it an i am very discerning when it comes to my tires. I've also driven them at 120 mph on open road..smooth as can be.