I have noticed on mine a while back that I had to rebalence my tires and I noticed they took a lot more wieght even beofre and still have really balanced out? I havn't seen any cracks on mine but it has worried me since that you said you felt a vibration. mine are about 6 months or so old and now I'm worried about mine. I don't autocross on mine, there just my street rims but I still push my car on the street sometimes, but never like i would at a autoX
Do you think I could get my rims replaced? This is starting to scare me to even ride on them now.