1 Answer

Sweden
Between December 1st and March 31st it is mandatory to have winter tires or equal equipment.
During the mandatory period the tread depth must be at least 3mm. These rules also apply to foreign
cars traveling through Sweden.
Any trailer attached to a vehicle needs to follow the rules regarding winter tires.
If the vehicle has studded tires then so must the trailer. If the vehicle uses friction tires it’s ok to use
friction tires or studded tires.
In Sweden studded tires is allowed between October 1st and April 15th or if winter road conditions
apply or is expected.
Heavy vehicles are not required to use winter tires but should have at least 5mm tread depth.
There are some exceptions e.g. when driving or being towed for repair.
For more information (in English) check out the Swedish Transport Agency website where you can
find e.g. the definition of winder road, the definition if winter tires, rules regarding lorries and trucks etc.