coz the tab pokes out into the wheel well. and when your lowered....like quite low, the tyre is very close to it, when the car is in movement and comes across bumps in the road and dips, the car moves up n down and the tyres rub the tab every now and then.
for 18s 40 sidewall is spot on sir, 45 is like a bit too much. Also i recommend 225 for the 9.5, good stretch and still the load rating is above 91 for the CL9's =D
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