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AutoSock is more effective than winter TIREs and are also more effective than snow chains in certain situations. They have been tested and formally approved by several leading manufactures, and TÜV SÜD in Germany. AutoSock can be mounted on summer tires and winter tires (with or without studs).
AutoSock will improve traction on snowy or icy surfaces. It is recommended that you take them off when you get back to road conditions where no snow or ice is present, e.g. dry asphalt. During the approval test by TÜV, AutoSock passed the distance and durability requirement of the snow chain norm (ÖNorm 5117). Nevertheless asphalt & concrete driving is not recommended as it increases fabric wear considerably.
AutoSock does not have the loud rattling and the bumpy ride which you associate with snow chains. Because there is no danger of damage to the vehicle structure they are approved for speeds up to 30mph, 50km/h; nevertheless your speed should of course be appropriate to the weather and road conditions.
They're likely to be wet and probably dirty. Put them back in their storage bag - gloves are provided. When you get home, dry them and shake the dirt out, and then remember to put them back in the Truck for the next time!
You get one pair (two AutoSock), which is to be mounted on the driving wheels.
AutoSock can be used where snowchains are required in Canada (**SOME APPLICATIONS**), the United States, Germany, Czech Republic, Slovenia and since last winter also in France.
BC (CANADA) RULES:
Yes, you can! AutoSock is 100% textile and will not damage your rims!
Yes, this is no problem if the AutoSock size you have matches the tire sizes of the other vehicle. You can check if your AutoSock size covers the tires you want to use: Just use enter the new tire dimensions into the size finder.
No, just stop your truck and engage the brakes. Make sure the truck is not on a slope during fitting. Pull the AutoSock over the driving tires and downwards as far as possible, and then move the vehicle approx. 1m, to pull the remainder into position. AutoSock will automatically become centered when you start driving. If you are stuck, do as above, but then make a small wheel spin instead of moving the truck.
AutoSock is a textile tire cover that increases traction on icy and snowy winter roads. AutoSock is very easy and quick to mount and remove – much easier and quicker than any metal snow chain.
AutoSock sizes depend on your cars tire dimensions. Simply enter your tire dimensions in the Size Finder
It is well known that snow and ice sticks to textiles. AutoSock is made from 100% high-technology fibers. These fibers, which become hairier with use, are arranged in a specific pattern in order to optimize grip. The specially developed textile has the advantage of handling water film found between the icy and snowy road and the tire, (generated for example by heat from the sun, or wheel spin), thereby maximizing the grip.
Tribology/ Dry vs. wet friction
Tribology is defined as the science and technology of interacting surfaces in relative motion and of the practices related thereto.
A tribological system consists of three parts:
- Upper surface
- Lower surface
In the case of friction on icy or snowy roads the upper surface is the tire or AutoSock, the lubricant is water film created by frictional melting and liquid layer on the ice/snow, and the lower surface is the icy or snowy road.
When the water film thickness is insignificant, we have dry friction; this is the case when braking a car at -20ºC. When the water film separates the two surfaces, we have wet friction; this is the case when a car water planes. AutoSock wants to have as large area as possible under the AutoSock with dry friction, since dry friction gives the highest friction coefficient.
Snow vs. Ice friction
- A surface pattern that makes the total contact area exposed to friction sufficiently large under both soft and hard snow or ice conditions
- A combination of surface pattern, strength and elasticity that make the contact points sufficiently sticky under hard snow or ice conditions
To some extent we have a trade off between good friction properties on snow relative to ice. It is favourable to open up the structure in order to increase the total contact area exposed to friction on snow. At the same time the contact points need to be sufficiently sticky on hard ice. The contact configuration of a tire or AutoSock can be quite different on snow relative to ice.
The upper figures show the contact configurations of a tire on soft snow.The figure to the left simulates compaction resistance, while the figure to the right simulates impact resistance.
The lower figure shows the contact configuration of a tire on ice where the macroscopic impact and compaction resistances are negligible.
The AutoSock is made of a special high friction textile fabric. In a frictional AutoSock sliding situation, electrostatic pressures can be defined in:
- The air gaps between: a) the sock surface and the icy or snowy road, b) the sock surface and the water film, c) the water film and the icy or snowy road surface.
- The interfacial contacts between: a) the sock surface and the icy or snowy road surface, b) the sock surface and the water film, c) the water film and the icy or snowy road surface.
- The water film.
The dry friction process is dominated and characterised by accumulation of electrostatic charges in the slider contact points. The frictional water film initiates discharge of potential differences between the slider and the sliding surface due to the much higher electrical conductivity of water relative to snow/ice.
The topography of the slider and the sliding surface is decisive for the electrical contact configuration between the slider and the sliding surface.
The electrolytic conductivity of a melted snow/ice sample may indicate the rate of ions introduced to the interface between snow/ice and the slider by frictional melting and thereby the rate and ease of discharge between the slider and snow/ice through the frictional water film during braking. Larger frictional electrification should take place on snow/ice with low electrical conductivity compared to snow/ice with high electrical conductivity.