I have search for this problem but haven found anything on it. The rover wheels in 0.23 seems to have been extremely over buffed, the smallest wheels used to break so easily and now they are literally indestructible. Take a look at their collision resistance in the VAB, the largest wheels have a breaking speed of 150m/s if I remember right. Isn't this removing features from the game such as EVA repair Here is a comparison with the last version of KSP: http://wiki.kerbalspaceprogram.com/wiki/Rover the values in the wiki are not yet updated