Monday, 3 November 2014
Do you need winter tyres on your BMW?
Winter is almost here for most regions of the world so the question is: Do you need to put the winter tire on your BMW?...
Most people believe in the misnomer that winter tires are needed for snow and ice, however since they live in a part of the country where there is little precipitation and only cold temperatures, they would not benefit form winter tyres. This is a fallacy, the chemistry of winter tires has been perfected to suit the unique driving environment of winter roads. When all-season or summer performance tires start to lose grip, hardening under cold temperatures -
Winter tires are just coming into their peak operating temperature range, soft and pliable, ready to grip the asphalt. The transition temperature
We could break the science of the winter tyres into two categories: Mechanical grip and Molecular adhesion.
Mechanical grip refers to the physical mating of the tread to the road surface. However the malleability of the rubber compound allows it to "interlock" with the undulations of the road surface (the rough rock/sand/tar or concrete surface). Therefore once again, temperature affects the malleability of the rubber compound, so pliable rubber compounds allow better traction. The trend pattern's ability to evacuate slush or water is also essential to mating the tread to the road surface. Therefore adding another facet to the tread pattern, winter tires contain thousands of tire "slipes" that act as separate biting edges in the snow. These slipes also add flexibility to the tread surface, which in turn, adds more grip on ice and snow. One interesting technology in particular has negated any need for studded tires (winter tires with small metal spikes screwed into the surface); this technology gains traction at a microscopic level using millions of "bite particles" to spike into the ice or snow.
A matter of money...