I just have TKC on the front with stock on the rear. On messed up surfaces like in NJ where the surface has been stripped for replacement it can make for nervous riding if you are not expecting it. Also I get a bit of head shake when overtaking or being over taken by certain semi-trucks with trailers. Not sure what it is about them, probably some magic ratio of length and height. Just makes me back off or speed ahead. But on dirt compared to stock I feel much more comfortable.