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Snow tire

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depends on the properties of the snow, which depend on its temperature and water content—wetter, warmer snow compacts better than dry, colder snow up to a point where the snow is so wet that it lubricates the tire-road interface. New and powder snow have densities of 0.1 to 0.3 g/cm (6 to 20 lb/cu ft). Compacted snow may have densities of 0.45 to 0.75 g/cm (28 to 47 lb/cu ft).
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passes over them than at warmer conditions with snow or ice on the road surface. However, as temperatures rise above −2 °C (28 °F), the presence of free water increasingly lubricates the snow or ice and diminishes tire friction. Hydrophilic rubber compounds help create friction in the presence of water or ice.
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In many prefectures, tread grooves of snow tires are worn off for more than 50% of their original depth, tires must be replaced to meet the legal requirements. Drivers will be fined for failing to comply with the snow tire or tire chains requirements, and checkpoints are in place on major highways.
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Snow tires operate on a variety of surfaces, including pavement (wet or dry), mud, ice, or snow. The tread design of snow tires is adapted primarily to allow penetration of the snow into the tread, where it compacts and provides resistance against slippage. The snow strength developed by compaction
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The deeper the snow that the tire rolls through, the higher the resistance encountered by the tire, as it compacts the snow it encounters and plows some of it to either side. At some point on a given angle of uphill pitch, this resistance becomes greater than the resistance to slippage achieved by
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Snow or ice-covered roadways present lower braking and cornering friction, compared to dry conditions. The roadway friction properties of snow, in particular, are a function of temperature. At temperatures below −7 °C (20 °F), snow crystals are harder and generate more friction as a tire
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Nationwide studded tire restrictions in Japan for passenger vehicles came into effect in April 1991, followed by restrictions for commercial trucks in 1993. Studded tires are still legal in Japan, but their usage is restricted by environmental law and it is a criminal offence to operate a vehicle
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high performance ceramic. The softer base is the part that anchors the stud in the rubber of the tire. As the tire wears with use, the softer base wears so that its surface is at about the same level as the rubber, whereas the hard pin wears so that it continues to protrude from the tire. The pin
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Many jurisdictions in Asia, Europe, and North America seasonally allow snow tires with metal or ceramic studs to improve grip on packed snow or ice. Such tires are prohibited in other jurisdictions or during warmer months because of the damage they may cause to road surfaces. The metal studs are
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The compacted snow develops strength against slippage along a shear plane parallel to the contact area of the tire on the ground. At the same time, the bottom of the tire treads compress the snow on which they are bearing, also creating friction. The process of compacting snow within the treads
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at the bottom of the jacket can be fitted nicely to the bottom of the hole. The metal studs come in specific heights to match the depths of the holes molded into the tire tread based on the tread depths. For this reason, stud metals can only be inserted when the tires have not been driven on. A
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on snow and ice. Such tires that have passed specific winter traction performance tests are entitled to display a 3PMSF (Three-Peak Mountain Snow Flake) and/or a IMP (Icy Mountain Peak) symbols on their sidewalls. Tires designed for winter conditions are optimized to drive at temperatures below
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are a type of snow tires which have metal or ceramic studs that protrude from the tire to increase traction on hard-packed snow or ice. Studs abrade dry pavement, causing dust and creating wear in the wheel path. Regulations that require the use of snow tires or permit the use of studs vary by
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the tread's contact with the snow and the tires with power begin to slip and spin. Deeper snow means that climbing a hill without spinning the powered wheels becomes more difficult. However, the plowing/compaction effect aids in braking to the extent that it creates rolling resistance.
372:– The following countries required snow tires between specified dates or when roads are snowy or icy: Austria, Bosnia-Herzegovina, Croatia, Czechia, Estonia, Finland, Germany, Latvia, Lithuania, Montenegro, Norway, Romania, Serbia, Slovakia, Slovenia, Sweden, and Russia. 378:– The following countries ban the use of studded tires: Albania, Belgium, Bosnia-Herzegovina, Bulgaria, Croatia, Czechia, Germany, Great Britain, Hungary, Luxembourg, North Macedonia, Montenegro, Netherlands, Poland, Portugal, Romania, Serbia, Slovakia, and Slovenia. 1073: 228: 408:
US states and Canadian provinces control the use of snow tires. Of these, Quebec is the only jurisdiction that requires snow tires throughout. Some may require snow tires or chains only in specified areas during the winter.
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requires it to be expelled in time for the tread to compact snow anew on the next rotation. The compaction/contact process works both in the direction of travel for propulsion and braking, but also laterally for cornering.
240: 852: 384:– The following countries allowed the seasonally restricted use of studded tires: Austria, Denmark, Estonia, Finland, France, Iceland, Ireland, Latvia, Lithuania, Norway, Russia, Spain, Sweden, and Switzerland. 1081: 626:
Nordström, Olle (2004), "Nya och begagnade vinterdäcks isfriktion: sammanfattningsrapport : undersökning avseende inverkan av ålder, mönsterdjup, slitbanehårdhet, dubbutstick och dubbkraft",
197:. Usually, there are 80 to 100 molded holes per tire for stud insertion. The insertion is done by using a special tool that spreads the rubber hole so that a stud jacket can be inserted and the 304:(Three-Peak Mountain Snow Flake) symbol, denoting a qualifying snow tire, and a separate snow flake symbol, that recommends tire replacement with 4 millimetres (0.16 in) of tread remaining 357:
As of 2016, regulations pertaining to snow tires in Europe varied by country. The principal aspects of regulations were whether the use was mandatory and whether studded tires were permitted.
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symbol to indicate that the tire has exceeded the industry requirement from a reference (non-snow) tire. As of 2016, snow tires were 3.6% of the US market and 35% of the Canadian market.
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All-season tires have tread gaps that are smaller than snow tires and larger than conventional tires. They are quieter than winter tires on clear roads, but less capable on snow or ice.
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should protrude at least 1 millimetre (0.04 in) for the tire to function properly. Snow tires do not eliminate skidding on ice and snow, but they greatly reduce risks.
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A narrower aspect ratio between the diameter of the tire and the tread width to minimize resistance from the plowing effect of the tire through deeper snow
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From 1 December to 15 March, your vehicle must be equipped with four winter tires that meet established standards and are in good condition.
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proper stud insertion results in the metal jacket that is flush with the surface of the tire tread having only the pin part that protrudes.
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Compaction of snow under an advancing snow tire, causing rolling resistance while passing through about 10 centimetres (4 in) of snow.
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when the road is covered by ice or snow. In addition, tire chains must be fitted for all vehicles on rural designated highways in
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Shoulder blocks, a specialized tread design at the outside of the tire tread to increase snow contact and friction
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Compaction in about 5 centimetres (2 in) of snow left behind a snow tire, showing tread-snow interaction.
1569: 1438: 443: 164:, or thin slits in the rubber, that provide more biting edges and improve traction on wet or icy surfaces. 1690: 1210: 1792: 1468: 1700: 966: 1672: 1531: 1488: 1418: 830: 605: 922: 1627: 1546: 1498: 1493: 51: 1614: 1400: 1345: 1046: 663: 145:
An open, deep tread, with a high void ratio between rubber and spaces between the solid rubber
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Vehicle in cold, dry, powder snow, which offers comparatively better traction than moist snow.
1513: 1478: 720: 1458: 1020: 326: 321:, have a traffic regulation requiring motorized vehicles to be fitted with winter tires or 314: 296: 8: 1584: 1220: 1192: 1168: 469: 445:
Chassis Handbook: Fundamentals, Driving Dynamics, Components, Mechatronics, Perspectives
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fabricated by encapsulating a hard pin in a softer material base, sometimes called the
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Attributes that can distinguish snow tires from "all-season" and summer tires include:
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Vehicles in warm, moist, granular snow encounter decreased roadway traction.
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Wet-film conditions on hard-compacted snow or ice require studs or chains.
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Winter tire, showing tread pattern designed to compact snow in the gaps.
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country in Asia and Europe, and by state or province in North America.
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Studdable tires are manufactured with molded holes on the rubber tire
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design with larger gaps than those on conventional tires, increasing
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Snow tire with metal studs, which improve traction on icy surfaces.
813:"Snow Tires on Your Car: Not Just a Necessity But Sometimes a Law" 19: 1632: 198: 117: 1230: 1723: 1184: 39: 35: 43: 1153: 835:
Ministry of Land, Infrastructure, Transport and Tourism
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fitted with a studded tire on dry asphalt or concrete.
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when regulated by traffic signs requiring tire chains.
552:. Springer Science & Business Media. p. 428. 448:. Springer Science & Business Media. p. 591. 157:
rubber compounds that improve friction on wet surfaces
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The 3PMSF (Three-Peak Mountain Snow Flake) indicates
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e-Gov Laws and Regulations Database (27 June 1990).
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The Physics of Tire Traction: Theory and Experiment
501:. St. Paul: MotorBooks International. p. 35. 941:"Cooper Recalls 7,067 Discoverer M+S Sport Tires" 1764: 967:"What You Should Know—Tires for Winter Driving" 66: 1074:"Designated Winter Tire & Chain-up Routes" 846: 844: 647: 395:National Highway Traffic Safety Administration 1169: 920: 789: 787: 1681:European Tyre and Rim Technical Organisation 1104:"National Parks Highway Traffic Regulations" 1080:. Transport British Columbia. Archived from 650:Effekter av vinterdäck - en kunskapsöversikt 603: 441: 317:, except for the southernmost prefecture of 923:"Winter driving in Iceland on winter tyres" 863: 841: 741:"winter tires new ice rating certification" 725:: CS1 maint: numeric names: authors list ( 597: 1176: 1162: 994:"The Joy and Terror of Urban Snow Driving" 857:law.e-gov.go.jp/htmldata/H02/H02HO055.html 784: 625: 205: 81:Dry and moist snow conditions on roadways 359: 344: 295: 124: 116: 18: 1021:"Legislation for Snow Tires in the USA" 973:. Tire and Rubber Association of Canada 652:, Väg-och transportforskningsinstitutet 470:"Prall Tester - Studded Tyre Wear Test" 1765: 1071: 1047:"Legislation for Snow Tires in Canada" 991: 947:. Modern Tire Dealer. 21 February 2017 584: 580: 578: 576: 541: 539: 537: 521: 494: 364:Russian studded tires warning sticker. 277:The IMP (Icy Mountain Peak) indicates 16:Tires designed for use on snow and ice 1157: 1110:. Government of Canada. 23 March 2017 442:Heißing, Bernd; Ersoy, Metin (2010). 269:F1805 (formalized in the year 1999) 648:Gustafsson, M.; et al. (2006), 545: 524:"How to pick the right winter tires" 353:which mandates the use of snow tires 285:F2493 (formalized in the year 2021) 1724:Uniform Tire Quality Grading (UTQG) 753: 573: 534: 498:Wheel and Tire Performance Handbook 13: 921:Brimborg ehf. (10 December 2017). 664:"Studded Tires for Winter Driving" 14: 1814: 992:Dudley, David (6 December 2016). 1747: 1746: 1736: 476:. Cooper Research Technology Ltd 388: 239: 227: 100: 88: 1580:Tire-pressure monitoring system 1122: 1096: 1065: 1039: 1013: 985: 959: 933: 914: 889: 823: 805: 747: 733: 681: 656: 604:ScienceDaily (6 January 2011). 263:10% better acceleration on snow 641: 619: 585:Glenne, Bard (December 1989), 515: 488: 462: 435: 291: 279:18% better deceleration on ice 1: 1570:Central Tire Inflation System 819:. Remington. 16 January 2015. 688:Subcommittee: F09.20 (2016). 522:Taylor, Rich (January 1985), 429: 1788:Inclement weather management 251: 67:Roadway conditions in winter 7: 1798:Vehicle safety technologies 1691:Tire Science and Technology 1211:Low rolling resistance tire 412: 181:. The pin is often made of 10: 1819: 134: 130:Nokian bicycle winter tyre 1732: 1699: 1671: 1613: 1545: 1512: 1399: 1344: 1191: 1183: 927:Dollar Rent-a-Car Iceland 877:. Continental Tires. 2016 765:. US Army. Archived from 340: 112: 495:Newton, Richard (2007). 382:Studded tires restricted 256: 171: 55:7 °C (45 °F). 1532:Slip (vehicle dynamics) 1489:Lateral Force Variation 1439:Pacejka's Magic Formula 1419:Cold inflation pressure 799:Tire Fair Trade Council 308: 1628:List of tire companies 1499:Traction (engineering) 1494:Radial Force Variation 1053:. Bartec USA LLC. 2017 1027:. Bartec USA LLC. 2017 901:www.uniroyal-tyres.com 859:. Government of Japan. 694:ASTM Book of Standards 587:"All about Snow Tires" 365: 354: 305: 300:Tire showing the ASTM 272: 220:Tire/snow interactions 206:Tire/snow interactions 137:Tire § Components 132: 122: 24: 1783:Ice in transportation 1479:Tire load sensitivity 875:continental-tires.com 546:Hays, Donald (2013). 363: 348: 299: 128: 120: 22: 1459:Self aligning torque 1130:"Winter Preparation" 945:moderntiredealer.com 754:US Army, Stuttgart. 630:(in Swedish) (966), 376:Studded tires banned 327:snow country regions 315:prefectures of Japan 46:. Snow tires have a 38:designed for use on 1585:Tire-pressure gauge 1221:Michelin PAX System 817:1816 – The Magazine 756:"Winter Tire Rules" 401:allow display of a 1623:Tire manufacturing 1454:Rolling resistance 795:"冬のタイヤの滑り止めルールって?" 772:on 22 January 2016 763:stuttgart.army.mil 366: 355: 349:A Czech road sign 306: 283:ASTM International 267:ASTM International 133: 123: 25: 1793:Automotive safety 1760: 1759: 1449:Relaxation length 1326:Formula One tyres 528:Popular Mechanics 351:Winter equipment, 1810: 1750: 1749: 1742:Outline of tires 1740: 1555:Tire maintenance 1504:Treadwear rating 1414:Circle of forces 1336:Continental tire 1276:Orange oil tires 1266:Mud-terrain tire 1246:All-terrain tire 1178: 1171: 1164: 1155: 1154: 1149: 1148: 1143: 1141: 1126: 1120: 1119: 1117: 1115: 1100: 1094: 1093: 1091: 1089: 1084:on 27 March 2017 1069: 1063: 1062: 1060: 1058: 1043: 1037: 1036: 1034: 1032: 1017: 1011: 1010: 1008: 1006: 989: 983: 982: 980: 978: 963: 957: 956: 954: 952: 937: 931: 930: 918: 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Index


tires
snow
ice
tread
traction
Vehicle in cold, dry, powder snow, which offers comparatively better traction than moist snow.
Vehicles in warm, moist, granular snow encounter decreased roadway traction.


Nokian bicycle winter tyre
Tire § Components
Hydrophilic
siping
tungsten carbide
hard
tread
flange
Compaction of snow under an advancing snow tire, causing rolling resistance while passing through about 10 centimetres (4 in) of snow.
Compaction in about 5 centimetres (2 in) of snow left behind a snow tire, showing tread-snow interaction.
ASTM International
ASTM International

prefectures of Japan
Okinawa
tire chains
snow country regions


National Highway Traffic Safety Administration

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