OEM tires are highway tires and only have a wear rating of 180. That means after the tread wears out, you're running drag slicks.
I bought these after it stopped snowing because I wanted performance tires. Being M&S rated, that is just a plus. I highly doubt these are great in snow, but I'm sure these are light years better than Brand New OEM in snow.
I am amazed at the wear rating of 420 because the rubber compound seems softer than OEM tires. These are also more quiet and do not squeak at quick acceleration.
The size is just bigger and wider (RH06's). That actually makes them worse in snow (from what people say) because a narrow tire "cuts" through the snow. But I doubt the difference matters from OEM to RH06's.
I live in Chicago and ran OEM tires for 52k miles! Auto 4wd and antilock brakes keep me alive. I never felt confident in rain/snow etc..., and finally was smart enough to invest in tires.
I plan to use these all season. If you live on rural roads where snow isn't cleared fast enough, definitely buy snow tires.
If I did buy snow tires, I'd buy Cooper Discoverer M+S 245/65R17. It meets RMA severe snow definition and can be studded from
http://www.tiresavings.com at $92.00 a piece.
RH06's are categorized as SUV Performance (RH06's can take on a pretty good load in case you tow, haul stuff around), so I don't expect much snow traction. I'll report back to see if the huge V grooves help in snow or just pack snow in.