I had Zeon's which had severe sidewall cracking, it was more noticable after some bumpy off road trails. I was refunded my money in full for the tires and I ended up going with a different brand. So far GY MTR's were fun and good for offroad but the car handled poorly and tires lasted about 20k miles. Now im using GY Duratrac's and they drive beautify, quiet, good handling, great off-road.