rominl

iTrader: (4)

well, isn't that what we have been talking about here? for 245/35/19, the matching size would be 285/30/19. etc.... so i guess the idea is still the same that as long as overall diameter is close then you are fine. of course, it's more hassle to make sure eveyrthing is within certain limits

nardeezy

I spoke with Lexus Headquarters today and I performed extensive research on the TIS website. I couldn't find anything on the site nor could they release any information as to what the maximum % diff you can have in rolling diameter. My theory is that it should be okay up to at least 1%, they have to program that into the system becasue even with the same size tire all around you are going to have variation among different factors (tire wear, air pressure, temperature change) that will in effect change the rolling diameters.

What I did find in the TIS is that if there is a wheel overspeed it will cause a cancellation in the 4WD system, requiring service. 1/2 of the causes being "tire size" and the other is the ECU. It indicates to change all tires to the same size for a soluition but there is no definition for "same". Anyways, I'm not even going to deal with it because a 20" staggered setup is very expensive to find out you can't use it if it causes problems.

The guy that posted pics of his white GSAWD with staggered 19" Lowenharts would be a good person to get feedback from. If he didn't encounter any issues then it would be okay. Unless he is using a tire setup that yields a 0% diff. Get him in this thread! I wish that the tire combo's for 245/30/20 and 285/25/20 yielded a 0% diff.

rominl

iTrader: (4)

with that tire setup the difference is like 0.7%?

ferrarilon

I have had staggerd wheels on my AWD for almost 8 months. The dealer didn't say anything.. and nothing really happened. I guess its ok??????

rominl

iTrader: (4)

now you gotta show us pics of your car and please please post up the spec of your wheels setup: size, width, tire spec, etc... trust me you are going to help a lot of people here

ferrarilon

I have Asanti Af 120 - 20"
Front is 245/30 20
Rear is 275/35 20
I forgot how to put pictures on... but i have links to my old threads on Houston imports...
http://www.houston-imports.com/forum...d.php?t=239450

sorry for the inconvienent....

rominl

iTrader: (4)

ah very nice so it works! and btw, i think you meant
245/35/20 and 275/30/20 instead?

that's even more difference in diameter than the 245/35/20 and 285/30/20 combo. that's good to know

LS4fun

Where did you purchase them from....do you know offsets?

Looks good BTW!

nardeezy

Dogg, you da man! Dude, you're front to rear % diff is huge! Running a 245/30 and 275/35 should make your rolling diameter in the rear significantly larger (+3%). Are you sure they're 275/35 in the rear and are you sure you had no issues? What are the roads like in Texas? I'm definitely going with 245/30 and 285/25 with Tanabe NF210's (hopefully). Since you installed that staggered setup on your car without knowing the possible drawbacks, why don't you hook up some Tanabe NF or DF210's and let us know if it works. If they do work, which they should than your car will look sick. I have the same car you have bro!

nardeezy

It looks like you're running Nitto 555 tires. I looked up the spec's, if you're running the same brand and style in the rear you're probably running 245/35/20 (26.69 RD) front and 275/30/20 (26.61 RD) in the rear, yielding a .299% diff. That's pretty low! Those are the only available tire sizes for 20" wheels in the Nitto 555. If I ran a 245/35 and 285/25 the lowest it would yield is a .77% diff, more than double what you have.

ferrarilon

If I know I can put 285... i would have done so. I don't think any company has made Springs for the AWD yet. I believe Tanabe NF 210's are for rear wheel drive only. They have a completely different sets of springs. Tanabe is coming out springs for the AWD sometime in the summer. I really have no idea about all this percentage stuff. I guess I did the right thing? I just went to a rim shop and asked them to put on the rims I want. They ordered it and nothing happened. I just can't wait till I drop the car. !!!!!!!!!

rominl

iTrader: (4)

i don't know but i don't think your calculation is right.

285/30 is a better match with 245/35 than 275/30.... the sideware of 275/30 is quite a bit less.

here's the math:
sidewall of 245/35 = 85.75 = 3.375" (overall diamter is 26.75")
sidewall of 275/30 = 82.5 = 3.248" (overall diameter is 26.49")
sidewall of 285/30 = 85.5 = 3.366" (overall diameter is 26.73")

so you can see the 285/30 is a much better match. difference between 245 and 275 is about 0.97%, whereas between 245 and 285 it's about 0.07%

rominl

iTrader: (4)

moreover, the side of the rim you put the tires on will have effect as well.

for example, if you have 8.5 front and 10 in the back, then 245 and 285 is a good choice

now if you do 245 and 275. the 275 will actually stretch in the rear a bit, making the overall diameter even smaller, so the difference will be even more than 0.97%.

ferrarilon

dang... you guys are crazy... with all that caculations. I need to learn that **** man. In conclusion... my rims fits and does not rub....... and I need a drop!

nardeezy

You can do all of those calculations which is great. However, you have to lookup the actual inflated specification for the tire relative to the specified wheel width. I did those calculations too but the manufacturers specification will differ. I grabbed 26.61" and 26.69" from the Nitto website. To determine the actual % difference you have to get the inflated diameter from the mfg's spec not by calculating.

ferrarilon didn't say what his wheel widths were. I'm assuming 245/35/20 and 275/30/20 are for 20x8.5 and 20x9.5 wheels. Using those size wheels and tires would yield 26.61" and 26.69" not sure which is the front and rear OD's(according to the Nitto spec) , yielding a .299% diff.