anish3232

I tried to find some posts, but they are all old posts from 2013-2015. How are staggered fitments holding up on the AWD system?

I recently traded in a RWD 06 IS for a 2015 AWD FSport GS (certified) and I had Vossen CV4s on the IS and they are now just sitting in my garage. I read tire specs and got new front tires 245/35s and the back tires are already 275/30s. The wheels are 9" wide up front and 10.5" on the back. Just wanted to see how cars were holding up, if anyone has had issues, etc. I'm a little hesitant since I have a certified car with warranty, etc.

Also I plan on switching back to factory wheels and tires during Nov - March every year.

Juju00

I have no problems. I have a 2013 awd going on 20k miles. My car is also certified. I' running 255s and 225s

anish3232

Dealership ever give you any trouble?

GrandSedanFan

iTrader: (1)

Staggered widths have no effect on AWD cars as long the outer diameters of the tires match the OEM tires. Use a tire calculator.

anish3232

DallasDave

iTrader: (1)

What you need to calculate is the overall diameter of the tires. Assuming you are usin 19" wheels, your proposed front tires will have a diameter of 25.8" (655mm). Your rear tires will be 25.5" (648mm). So a diameter difference of 0.3" (7mm).

That is about the same difference as running a brand new set on one axle and a completely bald set of tires on the other (~9/32" difference). This sounds like too much of a difference in size for my comfort.

Use a tire size calculator to find out what tires will be closest in diameter. As an example, moving to a front tire with the specs of 235/35-19 give you a diameter of 25.5" (648mm) - that's a perfect match and what you should strive for.

Good luck!

anish3232

JDR76

The AWD IS has a staggered setup from the factory. I'm being too lazy to look it up, but since it's the same system as on the GS, you could look up the percentage of circumference difference from front to rear on the IS and as long as you stay within that on the GS, I would think you'd be okay.

Knucklebus

I'm going to go on record as saying unless the gear ratios are different in the front and rear differentials, the tire diameter must be within a very small percentage of difference. Otherwise the drive train will bind up and wear itself out.

DallasDave

iTrader: (1)

+1 I totally agree

JDR76

I don't think anyone would argue that point.

On the IS350 AWD, the front uses 225/40R18s, which means they have a diameter of 78.8".
The rear tires are 255/35R18s, which means they have a diameter of 78.6".

This puts them less than half a percentage point apart. So my suggestion up-thread was to stay within that on the GS.

anish3232

I ended up going with 235/35/20 and 275/30/20 both tires are within 0.4% and are only 0.1" taller compared to stock wheels/tires. Should have my Vossens mounted in the next 2-3 weeks.

DiezDos

I've been running same wheel size for over a year with no issues whatsoever.

turbo1

Pics please?

anish3232

Will have these mounted in the next week or 2, weather is finally warming up. Trying to decide what brand lowering springs to get, but I may wait to install the springs till later this summer.