I had a question regarding 19" tire sizes. I have an '08 G35 sedan and am not lowering my car. The recommended sizes to stay close to the OEM 18" tire diameters are: 245/40/19 (F) and 275/35/19 (R). I'm wondering if I can do 255/40/19 (F) and 285/35/19 (R) to fill in the gap better? Here are the diameter specs I found using an online tire/wheel calculator:

OEM
225/50/18: 683 mm (26.9")
245/45/18: 677 mm (26.7")

Option #1 (recommended)
245/40/19: 679 mm (26.7")
275/35/19: 675 mm (26.6")

Option #2
255/40/19: 687 mm (27")
285/35/19: 683 mm (26.9")

Compared to OEM tires, Option #1 is smaller by 4 mm in the front and 2 mm in the rear. Option #2 is taller by 4 mm in the front and 6 mm in the rear.

Tire places claim with Option #1, the diameters are close enough that our traction control, ABS, etc. will not be compromised. So isn't Option #2 close enough as well???

 

wow.. how many threads do you need to make on the same topic?

 

You may want to read this before you drop the coin for the 285's, especially since you don't know your offsets:

myg37.com link

 

Haa! Yeah, sorry for the double entry. I wasn't sure where this thread belonged and I REALLY need to know if I can do Option #2 because my wheels will be coming in this week.

So does anyone know if my "theory" is correct above???

PLEASE HELP!

 

You can use either setup with no problem
-GP-

 

i have 235/40/19 on front and 275/35/19 on rear - bridgestone re050's. i like the handling, but few tire choices for the 235 front. i'm going to option two. keep in mind that smaller tires (less wide in front) carve better in turns. wider fronts "hunt" going over un-even pavement.

 

sorry, i meant to say option one is better.
jimk

 

Did you have any side-view pictures so I can see the wheelwell gaps? Are you lowered?

And what do you mean by "hunting" with wider front tires?

 

Hunting probably means it pulls with the road. I had 275 up front on my Z and it would pull hard one way on uneven roads. But it didn't understeer.

 

275s in front?! Craaaaaazy! So what did you run in the back? Any pictures. Must've been super beefy!

 

You're not going to fill the gap any better one way or another. The gap between the tire and fender is determined by whether or not you lower your car. As you know, the overall tire diameter should be as close as possible to stock.

DPE probably has the stock offsets and they obviously know my offsets so they should be able to get you flush while not lowered. I have 245 in front and 285 in back mounted on my 20" DPEs. No issues at all and TPMS are working as well.

Which model wheel did you order? On their SIGNATURE wheels, they run the stem from the inside lip to the face. If you want to keep the TPMS, they can drill the wheels (on request) on the inside lip to accomodate the sensors. Ryan at DPE will know what I am talking about.

Did you already order your wheels? If not .. I would highly recommend lowering the car. The ride is fine IMO.

Also, there is a pretty decent compilation of information we've put together here:

https://g35driver.com/forums/g35-sed...ims-tires.html

 

I know lowering a car will definitely eliminate any wheelwell gaps, but a tire's side profile should help with that as well, I believe. For example, my OEM tires in the rear are 245/45/18. I know if I were to use a 245/40/18, the tire would have a thinner side wall, thus creating "more" gap. And, vice-versa, if I were to use a 245/45/18 -- the side wall would be thicker.

Is that a correct assessment?

Good to hear 285s will not rub! =D I am not sure if they drilled holes; I just emailed Ryan to find out. But I have asked him if the wheels are TPMS compatible and he's told me yes. So does that mean they went drilled holes already?

 

Not quite ... the overall outside diameter of the tire will be the same. You should always try to keep the stock rolling diameter. Therefore, the actual gap will not chage between stock 18" tires and your +1 19" tires. The ONLY way to change the actual gap is to lower it.

Lowering the car would have allowed you to go with a wider lip in the rear because the wheel actually moves inboard as the suspension compresses. If you have already ordered and paid for the wheels, please disregard as this is a mute point.

285 will not rub on my 10" wide wheels, but you are working with 9.5" wheels in back with different offset, so I can't say for sure without knowing the offsets. Toyo recommends 275 for use on 9.5" wide wheels.

TPMS compatible means they will drill them for you. You will end up installing the sensors on the inside lip and just capping them. The TPMS stem will not bee seen. Air will be filled using the right angle valve stem.