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Has anyone noticed on there Gen2 going from 225/40/18 oem to 235/40/18 or 225/45/18, front tends to run wider and understeer more. I have put 235/40/18 on so the side wall is a bit more, i have better traction under throttle and braking. rear has improved grip but front washes out more, which you tend to notice understeer more. Anyone else noticed this?
2 theories here.
1. Different brand tyres have less lateral grip
2.(and what causes most arguments) weight is spread over a larger area, so there is actually less weight per square inch placed on the tyre.
the strange part is.. why has grip increased in back with less weight? I dont disagree with u i know its fact.. im thinking tho more sidewall roll with taller side walls
I can fix the back with - camber and toe adjustment which will help with understeer
yep, id say its the sidewall roll, and that the tyre is actually a bit too big for a 7.5'' rim. i bet it would improve on a wider rim.
increase the rolling diameter will help forward/stopping traction. the larger diameter makes the contact patch slightly longer (headleads to taillights).
i don't think and extra 4mm for sidewall will cause much effect to steering dynamics.
but a 235mm wide tyre on a 7.5" rim may cause a slight bludge effect on the sidewall near the shoulder.
also there are many other factors aswell that could be cause this issue. tyre pressures, alignment etc have not been mentioned.
I have 18x8.5's 10kg rims, standard rim is 10kg thought about wheel weight.Im runing +48 offset
offset and wheel weight have little bearing on this issue. i'd be looking at wheel pressures and your alignment. did they change your alignment much when you fitted the new tyres? did you get new wheel at the same time as tyres?
No wheel alignment change. Wheels and tyres same time.
bingo!!!Quote:
Originally Posted by luke 3mps