There are plenty of threads on here about tyre depth/rolling diameter and the short answer is it doesn't matter (search my threads)duggy72 wrote:I was under the impression that all 4 tyres needed to be changed at the same time? Even a small discrepancy in tread depth between front and rear could affect the quattro system.Fliptop wrote:Just to add to this thread. My S4 came with the OE Conti SportContact 5s in 255/35/19 when I bought it. I swapped the rear pair a while ago, for the same again, but the front pair were brand new in March so only recently have I needed to swap the fronts after about 10K.
I've gone for the Good year F1 Asym 2s as they are my favourite tyre from previous cars, and the difference versus the Contis is amazing.
I've not fallen in love with this car yet. Most things are great, but I have always found the steering to be horrendous. Heavy at speed, the car tramlined like a bastard, and just not confidence inspiring. My 15 year old Saab has better steering.
Well that was what I though, until I fitted the F1s. The car is absolutely transformed. I now can't wait for the rear Contis to wear out so I can have a matching set. Much lighter steering, none of the horrid tramline effect that made motorways a chore and any sort of fun a- or b-road with a bit of camber a nightmare. Now it can fly around the lanes of North Yorkshire like I always hoped it would.
What a difference, can't recommend enough that anyone using them should ditch those Contis asap.
I take it that this did not adversely affect your car?
On different tyre and tread pattern though I wouldn't risk it. The usual advice is to change by axle, but with 4wd, haldex , DRC whatever, im not entirely sure that is good enough so woudnt take the risk
Im personally about to dump my 4 pzeros and go back to PSS, cant come soon enough, worse tyre ever but were on when I bought. Dumping 4mm left on rears