I have a question too... I recently switched from 16" (205/55/R16) to 17" (235/45/R17) wheels. Going from 205 tires to 235 tires, I felt absolutely no difference in the "heaviness" of the steering (I'm referring to parking lots, of course, not when turning at speed). Is there any kind of assistance for this? I ask this because on a BMW 320D E46, changing from 205 tires to 225 tires (so a smaller difference than the one I went through), the owner told me that the steering clearly became difficult.