One problem I had with the W106s - I'd guess that 8 days out of 10 I rode on totally bare pavement. The tires don't do well on bare pavement, I lost a lot of studs (probably 20 gone by the time I retired them) and I actually had one stud get pressed INTO the tire and cause a flat. This year I am getting a new winter commuter and I may wind up using my old beater on sunny days with dry pavement.