18" Wheel & Tire Discussion Thread
Joined: Jan 2009
Posts: 7,287
Likes: 189
From: Eastern NC
265/40 is almost 5mm taller than your OEM front tire and 18x10+20 will stick out around 35mm farther. If I had to guess, you won't rub but it will be close.
Well for referance, 18x9.5 +15 with a 265/35 will rub on stock suspension ( no added camber from aftermarket arms ) hit an offset calculator and look at the differences.
I had a 255/35/19 on a +15 wheel in the front at stock height with no rubbing so I think it would be ok despite being 5mm closer to the fender and having a bigger overall diameter.
It's TOO less.
Generally on these cars you want 9.5 in the front, +22 or lower, and 10.5 in the rear, +22 or lower.
Generally on these cars you want 9.5 in the front, +22 or lower, and 10.5 in the rear, +22 or lower.
Last edited by AroundMyHorn; Mar 22, 2013 at 06:13 AM.
The comment from russ713 is the remedy for your 40 offset wheels.
Just a hunch,you are buying some pretty cheap wheels.Bud,its better
to get wheels with proper offsets for our cars than to screw with
spacers to make e'm fit.By the time you add the cost of good spacers,
labor,lugs etc,you could have bought some wheels that have around a 20
offset.
Just curious,what wheels were you planning on getting?
Just a hunch,you are buying some pretty cheap wheels.Bud,its better
to get wheels with proper offsets for our cars than to screw with
spacers to make e'm fit.By the time you add the cost of good spacers,
labor,lugs etc,you could have bought some wheels that have around a 20
offset.
Just curious,what wheels were you planning on getting?
New Member
Joined: Dec 2006
Posts: 7,337
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From: Edina, Minnesota
I agree with @JCITY. The best solution is purchasing wheels with the proper offset. People use spacers when they end up with wheels having the wrong offset and need to recover.
--Spike
--Spike
Registered User
Joined: Mar 2013
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From: Montreal canada
need help choose tire 18x10.5
i have xxr 526 18x10.5 all around 20mm offset front and -10mm rear (30 mm spacer) my fender is rolled not pull . need help for choose tire size i live in montreal canada the road is ruff speedbump construction ... 235/40 or 245/40 or 245/35 !!!!!!! i have coilover std and im slammed . love look hellaflush or pretty flush. what is your opinion !!!!! tanks you guys 
Joined: Jan 2009
Posts: 7,287
Likes: 189
From: Eastern NC
If you are only using a 30mm spacer in the rear then you can fit a 255/40. Otherwise you will be stretching for no reason. Sounds like you already have you mind made up. Do what you want. Bye.
https://my350z.com/forum/2003-2009-n...questions.html
Your question would have been answered here
https://my350z.com/forum/2487452-post8.html
Q: What wheel sizes and offsets do I need?
A: Generally speaking, there are a LOT of different combinations that people are running on their Z or G.
Let's get the basics out of the way first: You need a lug pattern of 5x114.3, width between 8 and 11 inches, and diameter of 17", 18", 19", or 20".
Here are some of the more popular wheel and tire sizes (for good reason) that people put on their Z's. There is no "RIGHT" answer but there is a limit to how big or small you can go.
18" combination:
Front 18" x 8.5" , Offset +15 to +25, Tires 245/40/18
Rear 18" x 9.5" , Offset +15 to +25, Tires 275/40/18
(lower offset such as +10 in rear is possible but may require rolling)
Front 18" x 9.5" , Offset +25 to +30, Tires 255/40/18
Rear 18" x 10.5" , Offset +28 to +35, Tires 285/40/18 or 295/35/18
(lower offset such as +23 in the rear is possible but may require rolling)
19" combination:
Front 19" x 8.5" , Offset +15 to +25, Tires 245/35/19
Rear 19" x 9.5" , Offset +15 to +25, Tires 275/35/19
(lower offset such as +10 in rear is possible but may require rolling)
Front 19" x 9.5" , Offset +25 to +30, Tires 255/35/19 or 265/35/19
Rear 19" x 10.5" , Offset +23 to +32, Tires 285/35/19 or 295/35/19
(lower offset such as +23 or wider tires in the rear is possible but may require rolling)
From this, you get the idea of what is required to go with smaller wheels like 17's, (typically lighter, faster acceleration), or bigger wheels like 20's (bigger, heavier, usually makes you feel slower).
Get to know how to use the following tools and you will be able to figure out for yourself the correct offsets and tire sizes you need:
Tire size calculator (click)
Wheel Offset Calculator
Certain combinations of LOW OFFSET and/or WIDE WHEELS will require what is known as "fender rolling" or "fender cutting".
If you are not familiar with the term "fender rolling", here is a quick but useful lesson you can learn in a couple of minutes: Go outside to wherever your Z is parked. Run your fingers along the inside edge of a REAR fender just above your tires. You will feel a sharp edge and a flap of metal sticking inward towards the car. Now, go up to the FRONT fender, and feel the inside of the fender again. You should notice that the flap of metal has been "rolled" upwards on the front fenders. This is exactly what fender rolling is all about. The rear fenders will need to be rolled to make room for wide wheels or low offsets, or else your tires may rub on the metal when you take hard corners or hit bumps. Any experienced wheel/tire shop should know how to roll a fender. If you go to a shop that does not seem like they know what they're doing, get out of there.
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From: monticello new york 12701