Yeah, I realize that it would only be half the calculated 1" difference since the wheel is mounted in the center. But even half an inch is way too much for me. In fact, I called Eibach today to ask if it's common for their springs to sag. When I first put them on 5 years ago, I was able to make it in and out of my driveway just fine. Now the front of the car scrapes, even if I'm very careful. And it looks lower also.
But I'm surprised that you went for 305 35 19 to 285 35 18 and you saw almost no difference in overall diameter/ height?? or did you mean 285 35 19 and 305 35 18, which would make more sense b/c the added width would add to the sidewall height a little and negate some of the change to a smaller wheel.
For my fronts, should I go with a 255 40 18 or a 245 45 18? (rears will be 275 40 18). The general rule of thumb is that when you go up or down 1" in wheel diameter, you compensate for that by adding or subtracting 5 to the sidewall number. But the width would affect the overall diameter also, so I was thinking I can stick with the 40 sidewall if I increase the width to 255 instead of the stock 245? And this will give me almost the same overall diameter?
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Originally Posted by glw
The ride height change would only be half the overall diameter difference between 275/35-19 and 285/35-18 of 0.8" or 0.4" - less than half an inch. Half on top (wheel gap increases with body by this amount) and half on bottom (car is lowered by this amount).
In reality though, before I put my 18" Forgestar F14's with 285/35-18 Hankook R-S3's on today I placed them side by side with the old sport Rays with 305/35-19 R-S3's and saw very little difference - practically the same and much less than the calculated 0.2"
PS: I haven't yet weighed the wheel/tire on my change from 19" Sport Rays to 18" Forgestar F14's but from specs I saved about 6lbs per corner.
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