Hello
Next season I plan to do about 11 weekend trips from San Mateo to Incline Village (Highways 80 - 267) between mid December and mid March.
I will be transporting precious cargo (my 7 & 9 year old children).
I was thinking of getting another set of rims and winter tires and leaving them on for 3 months Dec-March.
Will there be ice on the roads during these weekend trips? If the answer is yes, either stud your tires or get a studless tire like the WS80, Xi3, etc. Icy roads are much more treacherous than snow covered roads. If ice will be a rare occurrence, then the tires you listed will be OK. Another option for snow covered (but not ice covered) roads is an All Weather tire.
Thanks for the insight on icy roads. In general the east coast has much icier roads than 80 in California. The reason is that out here it snows, then clears and warms up which usually results in the roads drying out. Back east it can start cold for extended times and the snow on the roads gets compacted to ice. Hope this helps.
Keep in mind also, when you hit the road from San Mateo to where it starts to have winter weather, you still have stretches of I-80 that will be moderate temperatures, so in an emergency situation, tires that grip the warm weather would be better than a pure winter tire, especially a soft studdable tire.
The east coast doesn't have an overprotective Department of Transportation like Caltrans and their chain controls. East coast won't tell you to put chains on, nor will they enforce it. In CA, if the conditions are bad enough, whether it's ice or snow, then they'll institute chain control for that section of road. At least with some form of winter tires, you'll be ahead of the curve, since the Caltrans definition for snow tires is very relaxed.
Over in Mammoth, I noticed they don't like to salt the roads, so the snow will get packed into ice, which is why they have chain controls for all of Mammoth during those conditions.
So you should still carry chains and know how to install them, especially during a R3 condition, such as during March of this year when the Tahoe area was under a R3 chain control.