Uncompromising grip on all types of winter surfaces. Out of competition on the ice tracks. Very low noise level, audible only at low speeds when driving on a clean road. With these tires, it is very difficult to achieve ABS actuation. Perfectly copes with leaving the track. After running-in in compliance with the manufacturer's recommendations, the studs took their position and after 15,000 km remain in place. I recommend to buy, the best studded tire.

Coming from Finland, a country of winter snow and studs. Have these on two cars
- 2007 Focus Cabrio
- 1998 996 C2

In most winnter conditions amazing grip level. However, two shortcomings. 1) The modern light studs do not penetrate well if there is loose snow on top of hard snor/icy surface. Obviously this has more to do with regulations rather than the tire brand and model. 2) These modern silica tires seem to collect a layer of snow in slow speeds, say below 30..40 km/h . Both these properties make the tires a bit Jekyll and Hyde. At best it gives enormous amount of grip but then you come on loose snow and you think you are driving very slow - and suddenly you have absolutely no grip. I wish we could still have the longer studs. I can tell it is not nice to get the impression of good grip for some 50 km (0.3 < muu < 0.5) and then in an open place wind has collected snow on the hard snow surface and a deer runs into your lights and you find absolutely no grip at all (like muu = 0.05). Fortunately I had my insurances. I dont think this would have happened with the old style big block, long heavy stud Hakkapeliittas. Those would have not given the level of grip on the 50 km stretch but they would have lost pretty much nothing coming to the loose snow.

What impresses me is the strong stud base. The cavity seems wrapped with a very strong compound and the studs seem to not come off at all. The construction of the tire seems very good for winter purposes, not too stiff nor too soft side wall. Subjectively I think I would prefer a sharper shoulder but that is more like an image in my head rather than supported by my driving experience.

If I was to develop this tire I would look into the slow speed attached snow layer phenomenom - perhaps on all the silica tires. I also would like to try something like raised tread on the lines of studs to get the modern studs penetrate better the loose snow on top of the hard.

I know one problem with the winter tire testing is that the tracks are always similar to get good comparability. But in real life the surfaces vary much more in winter conditions and a good winter tire should even the grip levels to predictable. As good as the X-Ice 4 is it is not the most predictable tire. Fortunately you can learn to predict the places where you will loose the grip. I find this all more of a result of rather compromized regulations than tire makes development work.

The best I have tried in winter conditions. Fantastic grip on ice and snow, comfortable ride and the studs seem to last much longer than on others I have owned. Going into the 5th winter of mostly urban driving in Reykjavik I can see that most of the studs have come loose now so they will be disappearing soon. I used to run Goodyear ultra grip ice arctic on my cars before, but the ride was rougher and noisier, the studs would be long gone by now and they did not have as much grip on snow and ice. The Goodyears had a better grip in the wet at high speeds though.

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Very good tires, on par with Nokian Hakkapeliitta 8, or even better when they were new. Maybe a bit faster wearing compared to Hakka8, but definitely better than Continental IceContact2. Of course these are not summer tires, so my scoring is compared to other winter tires.

This tire was bought for my old analogue awd car for use partially on road and ice track and it has been phenomenal. It made a twitchy and understeery car much more direct and leaning towards oversteer in a very preferable manner both in thems of controllability and for road feedback. My tires are quite narrow and has a bit of a wallowy feel on dry road. The width also dictates the feel of the tire in the wet, but is very much as expected from any studded tire in this dimmension. It made my car feel much more communicative in low friction enviorements

I've had the North4 studded tire for 3 winters ( 20-25 000 Km) in Manitoba Canada on a 2018 Kia Stinger GT limited AWD. They have never let me down, starting and stopping driving normal, is like driving in summer, but with some light tiktac clacking from the studs. The road noise is much better than any other studded tire due to advances in technology. I can feel a certain amount of slippage in rain and dry concrete, but on snow and ice ( and that's 90% of the roads here in winter) they dig in like claws. I drive in sport mode and it splits my power 80/20 to the back, and have the best control I have ever had in very bad conditions. The tires surpass my every exception and will be purchased again!

This is by far the best Winter Tire i have ever used. Compared to its competitors its miles better. The grip is outstanding, and the overall performance is perfect. I would never choose another Tire, unless its he next generation.