I had them on my 91 240sx. Unlike the ZRs, the ZR-4 is an all season radial, and is not a soft compund tire. They are good for all around, but IMHO, I dont think they are that great for performance. Had the ZR's on my 91 TT and they were great, just wear fast. BTW, I no longer have either of the above. my 2 cents.