Been through 2 storms here in Colorado. My tires handled the snow well without complaints. Not a noisy tire even though they have aggressive treads

I bought 2 of these Sigma Arctic Claw Winter TXi for my 2008 Ford Focus for winter driving in Duluth, MN. Duluth has a 7 month winter, quite a bit of snow and ice, and quite a few long steep hills to go up and down going to and from work. If I see a car ahead that can't make it up a snowy hill, I just change lanes and pass it. The Arctic Claw tires are mounted on factory aluminum wheels that I bought used, just for winter tires. The TPMS transmitters in the wheels are handy to keep track of whether the tires are low on air. I run Hankook Optimo H727's in the summer. When the tires arrived from Simple Tire, one of the 2 tires had some strange appearing deflated rubber bubbles on the INNER surface of the tire, as if there were air bubbles in the rubber when it was injected into the tire mold, then the bubbles collapsed after removal from the mold. Also, that tire, over the last 2 winters, kept losing air, but I kept adding air every 2 weeks, before the tire pressure warning light would come on. The Arctic Claw tires have around 7000 miles on them now. In the middle of last January, I noticed one unhealthy looking bulge on that bubble tire's sidewall. It didn't look trustworthy. I wrote to simple tire CUSTOMER SUPPORT about the problem a few months ago, but there was no response, so I bought a replacement Sigma Arctic Claw Winter TXi tire from Amazon.com. The inside of that tire looks entirely normal. There are no bubbles in the rubber. I'm going to have it mounted and balanced before next winter.