About 10 years ago, I moved from WI back to the Washington, D.C. area. While I was in WI my DD was a MOPAR FWD minivan. Because I was in business for myself and provided services year round on a time limited basis --- I had a Home Inspection company and most of the time the Inspections had to absolutely take place on the day scheduled No Matter What --- I routinely drive that van when there was ice --- sometimes black --- on the road and up to feet of snow on the ground. What kept me going --- even when some of the 4X4 SUVs were stuck spinning their wheels --- was properly sized, properly inflated Blizzacks, which were changed out every 3-4 years to ensure that they had plenty of tread on them.
Fast forward to my Spyder purchase a couple of years ago. I knew that I wanted to drive my Spyder in winter. In fact, I was looking forward to some ice and snow covered large parking lots where I could safely learn my Spyder's handling characteristics in a safe environment. In late May, I went to my "Go To" tire information source, The Tire Rack to do my winter tire research. Turns out that Blizzacks are still highly rated for winter use, but there were some new tires that just as high to higher ratings. Checked out new tire size recommendations for the Spyder and got cost estimates. Then I started checking out EBay and my local Craigslist for used, but in nearly new condition, used Blizzacks.
After a month or so, I picked up a complete set of properly sized Blizzacks (which had approximately 1,000 miles on them) for $200. Given that I had recently upgraded my OEM Toyota wheels to new alloys, I had the Blizzacks installed on my OEM rims for $60.
I drove my Spyder with the Blizzacks only in winter and found that they provided excellent grip and traction. Having said that, I need to add that ANY winter driving requires additional levels of caution and attention to detail than normal driving! Additionally, at least once a month, I took my Spyder to the local "DIY" car wash and did a complete undercarriage and full car wash. For the undercarriage I did the high pressure soap spray and the the high pressure water rinse.
When Spring comes, off go the Blizzacks and they are properly stored as described in previous posts. My non-Winter tires are Yokohama S-Drives mounted on Avanti alloy wheels.
The only other things that I feel it is important to add is that the fitment of Winter tires is different than the OEM specs. I would absolutely recommend that you consult with a Winter tire specialist to find out what tires work best with our RWD Spyders. Plus, if you do not already have extensive experience with RWD mid-engine cars, I would highly recommend that you find a safe place to experiment with the winter tires on your Spyder to determine how they interact with each other!