Ylee,
"Had a think and reckoned there was insufficient tyre wall compliance...
origonal tyres were 205 /45 x 17 on aq 7,5 j rim
went for 235/40 x 17 goodyear f1's"
This sounds to me like the F1's would have less sidewall??(40 profile versus 45 previously) Or is it because the width is wider(and the sidewall is taller,even though the profiles lower), or could it be that the Goodyear is just a better tyre?
I had F1's on my Carlsson, and was impressed, but they were 205/50/ZR16. Now I have the Aero with Yokohama 539's 215/45/ZR17, and they tramline etc.
What were your origional tyres? Also, what do you think of the above???
Nick.
PS. I believe you have an Aero. If so, does it have lowered suspension, as mine has?