I changed out the summer air in my tires this morning and put in winter air. I had to change the settings on my suspension from 10 where I usually run it to 7 to compensate. I always wait until the first snowfall before I do it, but then I remember that it really makes a big difference in the way the bike handles. I got the additive at Walmart in the auto department. If you get yours there, be sure you get the one rated for tubeless tires (in the red can with blue lettering).