Quote:
Originally Posted by alohasurftoad
to me, 225/45/18 is too narrow for F3/4-series on the track. at minimum i'd go 18x8.5 square with 245/40/18. if you use staggered oem 18"(400M or 441M), i'd go 245/40/18 on the 18x8 front and keep oem size 255/40/18 on the 18x8.5" rear. if you want to stay with your 403M, run 245/35/19 front, 255/35/19 rear.
here are pics of 442M, front tires size changed from 225/40/19 to 245/35/19 on the 19x8 +34. rear size remained oem 255/35/19(max on 8.5"). michelin pilot sport 4s. you need to increase front grip to reduce understeer on the track. staying with stock offset is good because the front track width is wider than the rear, which is better for handling as well.
i'd try this tire change 1st. you might be satisfied with the performance and ride with go-flat max performance tires, such as michelin pilot sport 4s or continental extremecontact sport, assuming you still want street tires.
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You know, I think that is the root of my dissatisfaction with the oem staggered 19" setup (besides the terrible ride quality of the runflats). That slower and heavier turn in feel compared to the quick agility and lighter front end of the 330i loaner vehicle I had with a square setup. If a wider front tire on my current 403m can help alleviate that, I would be pleased. Thanks for that suggestion!