I noticed in the "100 most common ?'s" that this setup is pretty common. What offset would be needed for the 245/40 and 275/40 combination for an 18" rim? I'm looking for optimal clearance on inside and outside of the top of the tire not necessarily what will make it flush with the fender. Also, will this all fit on a 9.5" wide rim, or is 10" more appropriate?

Note: Just want to go wider for daily street use, no tracking. And yes, I did many searches.

 

Fit is relevant to wheel width and offset. In extreme set-ups members might stretch tires on oversized wheels to get the wheel-tire combo under the car.

Find a member’s set-up that you like. Duplicate it. No need to reinvent the wheel. (I said a funny).

 

18x9 up front with +20mm offset (245/40-18)

18x10 out back with +30mm offset (275/40-18)

This would be a mild fitment on the 350z.

 

ill be running 18x8.5F 245/40/18 and 18x9.5R 275/40/18. +30 offset in the front and +35 offset in the rear. after i get my tires on ill measure to see what size spacers ill need to get them flush. if any1 has an idea of what size spacers ill need let me know.

 

Awesome, thats the kinda information i was looking for. Thanks guys, and i'll be waiting to hear more on yours, seekndestroy, when you get 'em in.

 

Here are your 245/40's on the front - you can get a lotta rubber under there, even on stock. I just really dig the stock wheels, so I went rubber, not Volks...

 

8.5, 9, & 9.5 are the most common wheel widths used to match 245/40 up front.
9.5, 10, & 10.5 are the most common wheels widths used to match 275/40 in the rear.
Generally, most people have a 1" wider wheel in the rear, because the rear tires are about an inch wider.
The offset you choose can vary. Most manufacturers only offer certain offsets for a wheel.
You'll have to see what other people have done and try to find wheels with similar offsets. I have a set of wheels that are 18x9 +18 and 18x10 +18 and it looks very good. I would highly recommend something similar.
Find some wheels you would like to buy, see what offsets are available in the widths you want, and use an offset calculator to see what will work for you.
http://www.1010tires.com/WheelOffsetCalculator.asp

 

245/40s are a little stretched on a 9.5. Try 255/40.

 

Pictures are worth many words. Very nice post, i always wondered if this would work with stock wheels. I dig them too, but i'm also undecided on an aftermarket set. Is this front and rear pictured or just front, btw?

 

No problems here. Falken lists 9.5" as a compatible size.

 

Recently purchased Z and has 225/45R18 on all corners - issues if any?

 

Grip would be an issue.

 

If it were me I would go 245/40-18 front and 275/40-18 rear.

 

I went with 8.5 +25 offset wheel for the front using 245/40-18 tire. For the rear I went with 9.5 +22 offset using 275/48-18 tire. It's not flush, tucked in some, it looks great - closer to the outside vs. stock OEM wheels.

 

i have stock wheels on my 2003 350z. finally gathered some money to buy new rims. what size should i get?

 

1. What size tires are you purchasing?
2. How do you use your 350z (i.e., track, street, other)?
3. Are you upgrading your suspension?
4. What type of brakes are on your car?
5. Are you planning to upgrade your current brakes?
6. What is your budget for new wheels?
7. What is your budget for new tires?
8. What is your budget for suspension upgrades?
9. Are you willing to roll your rear fenders?
10. Do you have a limit you will accept for wheel weight?

 

Just installed gramlights 18x9.5 245/40 and 265/40. +22 offset. They look WIDE. Should I be worried about needing a fender roll? Will I be rubbing or damaging my fender in the rear? I have read through out the forum NO, but I'm skeptical. Thanks in advance.

 

You won't rub. I have the same width wheel with more offset (15mm), a 275mm rear tire, and a 0.6" drop. I don't rub.

 

275/40 on 18x11 +20 offset rear wheels? Looking for a slight stretch.

 

That may be what your looking for