To OP
I had vibration issues on my Winterforce tires too. Keep in mind the small size I was running. 155/80/13 on steel factory rims for my 94 Honda Civic Hatch. I would get a highway vibration that would shake the car! Had enough decided to get the problem addressed. Turned out to be a out of balance tires prob from flat spotting. I was driving with these tires all year round because i sold the all seasons. I wanted a little more fun in the winter. My conclusion is the Winterforce being a studdable tire is not a comfort tire. Awesome in the snow with deep tread. I got hooked up with them because a local on Craigslist was selling two winterforce tires with rims for $25 dollars.
I had vibration issues on my Winterforce tires too. Keep in mind the small size I was running. 155/80/13 on steel factory rims for my 94 Honda Civic Hatch. I would get a highway vibration that would shake the car! Had enough decided to get the problem addressed. Turned out to be a out of balance tires prob from flat spotting. I was driving with these tires all year round because i sold the all seasons. I wanted a little more fun in the winter. My conclusion is the Winterforce being a studdable tire is not a comfort tire. Awesome in the snow with deep tread. I got hooked up with them because a local on Craigslist was selling two winterforce tires with rims for $25 dollars.