
M+S = Mud and Snow Tires
Some Mud and Snow Tires also have the Snow Flake Mountain Symbol but are "WINTER USE ONLY" tires. Tires that don't have the Snow Flake Mountain Symbol may be designed and built for Mud and Snow but may also be excellent winter tires . The manufacturer has decided not to use or participate in the use of symbol for different reasons; Tires can be used all year round, Canada wasn't their intended market, have their own rating system, don't produce a "WINTER USE ONLY" tires or don't want be in that market.
AT = All Terrain
Some All Terrain Tires also have the Snow Flake Mountain Symbol but are "WINTER USE ONLY" tires. Tires that don't have the Snow Flake Mountain Symbol may be designed and built for All Terrain but may also be excellent winter tires . The manufacturer has decided not to use or participate in the use of symbol for different reasons; Tires can be used all year round, Canada wasn't their intended market, have their own rating system, don't produce a "WINTER USE ONLY" tire or simply don't want be in that market.
AS = All Season
These will not be rated as a "WINTER USE ONLY" they are "All Season" tires. This doesn't mean they are not any good as a winter or snow tire. It means they are not rated as a "WINTER USE ONLY" or are they rated as a "Snow Tire". Basically they are general purpose tires.
Snow Flake Mountain Symbol = Tires rated by Rubber Association of Canada "RAC" for "WINTER USE ONLY".Quote from their website
"The following list provides the model names of RAC Member tire brands only tires that are dedicated and marketed for winter use only. Many tires can be suitable for winter driving. Some of which may not be on this list. This list shows RAC member brands of tires with the mountain snowflake symbol that are marketed for winter use only".
These tires are a multi-siped soft rubber compound tire designed to remain very flexible at cold temperatures. These tires perform well for their intended purpose. This rating symbol may also be on "Mud and Snow" tires and "All Terrain" tires which means you must remove the tires once winter is over. With warmer weather and dry roads the softer rubber compounds will wear more rapidly.
Before investing in tires with "Snow Flake Mountain Symbol", consult with the tire manufacturer or reseller such as National 4WD Centres on the specifications of the tires you are considering purchasing. Also check out The Rubber Association of Canada's website for more clarification on the symbol.
http://www.rubberassociation.ca/wintertires2.html
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Peter Scott
Director of Marketing
National 4WD Centres
http://www.national4wd.com
Canada: 1-800-575-7500
International: 905-634-0001
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