I appreciate that clarification - didn’t know there was an actual test involved in the 3PMSF rating.
Still, we both agree that it is a proxy. I’ve seen (and driven) AT tires with a 3PMSF that do well in snow, and those with a 3PMSF the do poorly in snow. So, again, agree that the are marked differences in non-winter tires.
I don’t trust the 3PMSF as a reliable predictor of snow performance because actual snow performance varies so much in those tires with a 3PMSF.
In general, actual winter tires are significantly better in snow than AT tires. There are some all season tires, like the LTX, that are better than AT tires in snow. When I lived in Vermont, I had BFG AT KO on one truck, and Blizzaks (DM-V) on the other. Absolutely no comparison. The BFGs, lauded for their snow performance, were nowhere near as capable in snow, as the Bridgestones, and on ice, they were laughably poor by comparison.
I don’t understand the hate for the LTX. Mine were actually quite good in snow. Again, not as good as the Blizzaks, but surprisingly capable. My Tundra sees snow often. It’s my vehicle of choice for winter, not because it’s a truck, but because of the tires. The tires that I have put on the truck have all been selected with snow performance in mind.
The best winter performance I have had in non-winter tires, were the Nokian WR-G3, but they wore quickly. Latest set of tires on the truck are Nokian Outpost nAT, which promise good snow performance from a Finnish company known for snow performance. Yeah, they are AT tires, but I don’t off-road much anymore, and I was looking for decent manners on road with good snow performance.
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