For anyone wondering about the Vredestein Wintrac Pro tires, we've had them on for over a month and they work pretty well. Don't have any data on efficiency but we've had snow for weeks and they work just like any other stud-less winter tire. Bought on Tirerack, shipped to Alaska and installed on factory 19" rims.Easy tire had the staggered set if Hakka r3suv tires. So far we have no complaints. Mounted on 19 inch Volvo wheels from a xc90. Also in the US the continental viking contact 7 is not available in our front 235 50 19 tire size. The other tire that I saw earlier this fall in the staggered set was the vredestein wintrac pro (listed by tirerack in the same category, performance winter, as the pilot alpin 5).