I had G3's on my old VR V8 cop car.
ok tyres, but really, for the cash, they were crap.... crap i say. wife lost it a cple of times. just didnt have the grip youd expect them to have, on a slippery surface.
best priced and performing tyres Ive ever used on a car are my current fare; Hankook Ventus K104 awesome tyre, $190 ea for 17x 235
I dont see how you can lose traction with these tyres on the street - if you do then you're doing something wrong. ie coming too hot into a corner, or perhaps braking thru the corner (big no-no; always end your braking B4 you hook into the crnr)
mind you, i do have AWD and a few extra hundred kgs in the stagea so maybe that makes a difference to a RWD skyline, in the way that they handle..... but this set should last 4yrs (35,000kms). top value. id argue that with anyone.
best bike tyres Ive had were Michelin Pilot's, top of the range goodness $290 for rear and $230 for front. worst tyre was Michelin sports, long range tyre not made for kneedown cornering. meant to last 12000kms, I ripped mine up in 5000 lol.