about 4 months ago on damp morning in june i bought my astra, a 2002 1.6 sxi hatchback, it had already been lowered and had a set of 18" tsw kyalami wheels and 215/35/18 Nankang tyres, after buying it literally 2 minutes up the road came to a round about going about 25mph and the back end slid out, luckily i managed to correct it and stay away from the kerb, thinking there must have been diesel on the road or something i carried on, but when i came to the next round about the car done exactly the same, so i pulled into the first petrol station i came to and checked all the tyre pressures, they were all over the place, pumped them all upto 30 PSI as a starting point and drove home seemingly ok.
Since then everytime its wet weather the backend of the car slides, last weekend because i knew the likelyhood of the back end sliding i was going 10MPH round a roundabout and the back end slid out again, its done it 5-7 times, as i mainly only use the car on the weekend. i know this aint normal handling for an astra as i have driven loads at work, i'm a mechanic.
I have looked into tyre pressures as it originally felt like the rear tyres were over inflated, i even found out a formula for working out the correct pressure for the tyres based on the load index of the new tyre and old tyre and the original recommended tyre pressure from vaux.
I recently suffered the unfortune of hitting a pot hole and damaging the n/s/f alloy, a mate of mine works at a tyre shop and i gave him my wheel to send it off for repair, and he told me that the nankang tyres have extremely bad wet weather grip, which it seems what my car is suffering from, and he recommended a couple of tyres that would improve this, namely the toyo proxes 4.
my question is, can anyone recommend a good wet weather tyre for the back of my car? and has anyone got 215/35/18s on their car and what tyres and pressures are they running and how does the car handle in the wet?
sorry for the long post but wanted to try and explain the full story