Om dom är framtagna för vinterväghållning har dom den mjuka gummiblandningen... Då kommer dom också komma med på STROs lista. De med hård gummiblandning är inte framtagen för de vinterförhållanden vi har i Sverige och är inte godkända, även om dom är grovmönstrade och har M + S märkning.
Med Alptoppen/snöflingan (3PMSF) kan man vara mer säker på att det är ett vinterdäck som är lagligt.
This marking is a declaration on the part of the manufacturer during Type Approval process and can be displayed next to an ideogram of a three peak mountain with a snowflake in the middle, known as 3PMSF ( 3 PEAK MOUNTAIN SNOWFLAKE ). The 3PMSF marking certifies that the tire has passed the Homologation tests set out in the EU regulation 117. Here in La Thuile, it was displayed for the first time to both the institutions and the press”.
Several tests have compared 3PMSF, M + S and SUMMER tires: in each test and on all types of surfaces, the new concept high performance winter tire, represented by the 3PMSF label, proved to be the best solution.
How a 3PMSF tire is approved
In order to obtain approval, the snow grip index of the tire in question must be at least 1.07 compared to a standard reference tire called SRTT.
Approval tests simulations in La Thuile, were performed with two Fiat 500 Abarth equipped with a set of tires SRTT (Standard Reference Test Tyre), size 195/75 R14 - and 3PMSF winter tires size 185/55 R15 respectively.
A comparative braking test with active ABS was performed. The car was driven up to a speed of 28 km / h, put into neutral and then brakes with active ABS were applied down to a residual speed of 8 km / h. Therefore, the average deceleration was calculated by measuring the distance traveled and the time elapsed between the moment when the speed was 25 km / h to the moment it reached 10 km / h. The test was repeated in order to take into account any changes in the condition of the track.
It was possible to observe the real differences between the two types of tires with a definite advantage for those with 3PMSF markings.
http://www.pneurama.com/en/rivista_arti ... &ARCHIVE=1
Jag förstår inte att man försvarar sånna skitdäck (för svensk vinter) och envisas med att vilja ha däck som är värdelösa i halka. Man vill väl ha så bra grepp som möjligt vintertid?