Review on Circuit Performance 30mm Black Rubber Valve Stems TR413 (Set of 4) – Enhanced SEO by Christopher Lance

***UPDATE 2022***: I had two of these that started leaking and falling out causing my trailer to explode at over 65mph. Very dangerous. I bought a new trailer tire and took my trailer home. A few days later the other tire was completely flat. When I tried to air it, the barrel wouldn't hold any air. I tightened the valve core but it didn't help. It was dripping from large cracks around the base of the valve stem. GARBAGE. Now I have to take out and replace every tire I've used them on before I blow out again. If many of us are having this problem, we should sue this seller. The seller refuses to refund my money for this purchase. ***Original Rating***: I mounted them on about 4 sets of wheels (summer and winter tires for 2 cars) and within a year they each had deep cracks. when you bend them. The rubber they use is of very poor quality. On the last set of tires I put on, I reused 7 year old valve stems because they weren't cracked and looked better than the 1 year old. As far as I can tell they aren't breathable yet, but I won't be using them anymore. I will update this review based on how Circuit Performance Support resolves the issue.