QSVeilside

I will be dropping my IS350, and had some concerns about ride height. I am not a fan on driving around speed bumps, or laterally in and out of driveways, NOR am I a fan of the ugly fender gaps on this car... and I do mean UGLY! Seriously, the front fender gap has to be at least a third of an inch wider than the rear. It is disgusting to say the least.

Solution:

Springs + Bigger tires AND we do not want rubbing issues.

Eibach claims a 1" drop in the front and a 0.8" drop in the rear.

Stock information taken from 4TehNguyen's aftermarket wheels post, (which is getting cluttered beyond recognition. Hence, the creation of this post):

17" RWD:
Front: 225/45/17, 17x8 +45mm
Rear: 245/45/17, 17x8, +45mm

17" AWD:
Front and Rear: 225/45/17, 17x8, +45mm

18" RWD :
Front: 225/40/18, 18x8, +45mm Overall Diameter: 25.08" Radius: 12.54"
Rear: 255/40/18, 18x8.5, +50mm Overall Diameter: 26.03" Radius: 13.01"


Calculator:

http://www.1010tires.com/TireSizeCalculator.asp

Going with:

Front: 235/35/19, 19x8 Overall Diameter: 25.47" Radius: 12.73"
Difference from stock height, (take the difference in radius not diameter):
0.19" Roughly a fifth of an inch higher.
Or

I highly doubt this will work without rubbing, but just thought I'd throw it on here in case anyone has tried this tire size on their front 19" wheels.

Front: 225/40/19, 19x8 Overall Diameter: 26.08" Radius: 13.04"
Difference from stock height: 0.5" higher

For the Rear:

Going with:

275/35/19, 19x10 Overall Diameter: 26.57" Radius: 13.28"
Difference from stock height: 0.27" higher

Probably will rub with these:

285/35/19, 19x10 Overall diameter: 26.85" Radius: 13.42"
Difference from stock height: 0.41" higher

True drop with Eibach Pro Kit springs?

First setup consideration 235/35/19, 275/35/19:

Front: 1" - 0.19" = 0.81" drop in overall height

Rear: 0.8" - 0.27" = 0.53" drop in overall height

Second setup consideration 225/40/19, 285/35/19:

Front: 1" - 0.5" = 0.5" drop in overall height

Rear: 0.8" - 0.41" = 0.39" drop in overall height

Would anyone like to share their success with any EXTREME tire setups, (including offsets if possible), for 18, 19, or 20" wheels?

IS_250

iTrader: (2)

where are you measuring the change in overall height from? center of the wheel to top of the fender or ground clearance?

QSVeilside

Good question.

If I'm not mistaken, please correct me if I'm wrong here:

Eibach drops the front fender to the center of the wheel approximately 1"

You could say that it drops the entire car and lowers ground clearance by the same amount.

The distance from the fender to the center of the wheel will not change when you increase tire size. But it will raise the ground clearance.