Winter tires that don't work in snow 2

[MintJulep]

Company recalls more than 541,000 winter tires over lack of traction in snow

Owner notification letters should be mailed out by February 1, 2025.

local12.com

 

[dtimberlake]

That Pirelli link mentions at 7° C ( 45°F !) summer tires' dry road " stopping distances may be as much as twice those of winter tyres, especially on wet roads."

No mention of how " all season '" (no season) tires might compare.
In the 1980s I had one set of cheap Sears all-seasons that performed amazingly well on snow and ice.
I was immediately so impressed with their performance I studied their tread design.
As I recall their tread blocks were pretty small, and heavily siped.
Smaller/narrower than these, and the sipes may have run across the tread blocks.

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTeydHrjfs10qX-uIuFvbZM5-tQ3e9r9X20WQ&s

 

[Alistair_Heaton]

I have crossclimate 2's on my cars.

They are great all season. Extremely impressive in the rain. And in the staff car park I less trouble than the winter no studs tyres.

Only issue now is they have changed the law to require 4mm tread on winter tyres and all season with snowflake. The cross climate come with 6mm new mine are two years old and I will get one more winter season out of them. 35000 km on them today

 

[IRstuff]

The snow/packed snow/ice that forms almost always has a film of water atop it, and the result is slicker than snot on teflon.

I think even just tire contact pressure on ice will develop the water film, similar to how ice skates float on a thin layer of water in the ice rink. If the tire rubber gets too hard because of the temperature, it adds to the slipperiness. While all-season tires might fair better than summer tires, their rubber formulations have to perform and wear well during summer, so all-season tires have to be somewhat harder than desirable in freezing conditions, such as at the hill just before California Lodge at Heavenly during peak ski season. I've had the displeasure of sliding around on that hill, as well as the hill before Mount Waterman ski resort; that's ZERO fun at all

 

[Alistair_Heaton]

Well I predict a collosal number of car crashes in the UK over the next couple of days.

Weather warnings - BBC Weather

Latest weather conditions and forecasts for the UK and the world. Includes up to 14-days of hourly forecast information, warnings, maps, and the latest editorial analysis and videos from the BBC Weather Centre.

www.bbc.com

 

[LionelHutz]

It actually matters quite a lot.

For the purposes of that rather vague graphic it makes NOT ONE BIT of difference, and there is nothing you can write to convince me even in the slightest otherwise.

My comments were directed at that graphic ONLY. Your comments don't even apply to that, and even have nothing about how that affects the performance of winter vs summer tires. In fact, I don't even know why you're quoting me except to be purposely argumentative since your posts have nothing to do with mine. You even quoted only part of my response to get rid of the part which indicated my response was directed at the graphic just because it fit your narrative better.

It's impressive how people just MUST tell others they're wrong based on some new and completely irrelevant thing.

 

[waross]

If there's a water film between tire and ice it's a lot more slippery.

That is a worrysome effect at or near 0C but traction increases quite a bit with dropping temperatures.

I have experienced conditions where a vehicle could be stopped, but in a few seconds, the pressure of the tires would develop the ice film and the vehicle would start sliding downhill. It could then be stopped for a few seconds and would then start sliding again.
But, after starting to drive on ice and snow in about 1958, with all manner of tire treads and rubber variations, and at all temperatures down to -50F, I won't waste my time in this thread any more.
A lot of experience is no match for a little experience.

 

[dik]

That is a worrysome effect at or near 0C

It can be quite a bit colder than 0C. The process is called regelation.

 

[btrueblood]

This is where studs - long studs - are really helpful.

yes, or chains.