Windshield washer fluid is the cheapest, and RV-antifreeze works too. Rim guard is more expensive but works too. Don't ever use calcium chloride. The RV antifreeze is good if you're worried about losing a bunch of it in the yard if you have an accident as it won't kill animals. I avoid this problem by putting fluid only in tubed tires. There's another thread in here that people were sharing their various methods of filling tires. I use this contraption I made out of some PVC pipe that I fill with fluid and push into the tire with compressed air.
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