I have this product called tru balance. Basically bags of compacted material that you pour into your tires. You can do it when mounting on a new rim or just break the bead. It keeps your tires balanced at all times. Compensates for any rocks or mud in your tread unlike weights and lasts the lifetime of the tire. I run it in my 35s and have numerous friends that run it in their 38s and 40s. That's how I found out about it. It was made for larger sized tires and semi tires but im sure it will work in smaller tires too, however I cannot give any input on that because I have only used it in larger tires (35s and up). I run it in my Cooper Discoverer Stts. Also have it in a set of 38 and 40 toyos. Make sure you take off any weights when using this because there is no need for them. Just rotate your tires and they should ride smooth. Another plus if you have some nice wheels and don't want weights stuck on them this can be an alternative. Use one bag per tire. I have a lot left over so if anybody wants to try it give me a shout. 4 bags is $60 shipped.