Will this fit? (width, offset and tire size Qs)

[n8dog11914]

My old 350Z came stock with 245/45/18s on a stock 8" rim.

[Foobar]

Originally Posted by ft_sjo

Not really, the tyre will behave differently at each of those different widths. Just because it will physically fit doesn't mean it's the right thing to do.

That's the recommend rim width range for a 245 width tire. In other words, it's the safe range without being "pinched" or "stretched".

I never said it would behave the same throughout the range, but it certainly isn't the "wrong" thing to do. If we're talking about what's physically possible, then the range is beyond 7.5 - 9.

I should also add that some manufacturers may have different recommendations, Yokohama for instance allows 8 - 9.5 inches for their 245/40 series.

[CSG David]

245/40 works well on a 9" wheel. Many EHP 245 width tires run a little wider than standard 245 tires. It's wide enough to make it look normal on a 9" wheel. Lowering will allow for a lower offset since you get some extra negative camber. Most people are using +35 to +40 with success on stock suspension.

[ft_sjo]

Originally Posted by CSG David

245/40 works well on a 9" wheel. Many EHP 245 width tires run a little wider than standard 245 tires. It's wide enough to make it look normal on a 9" wheel. Lowering will allow for a lower offset since you get some extra negative camber. Most people are using +35 to +40 with success on stock suspension.

Thanks. I want to keep the wheel as close to the suspension as possible with a 5mm gap. ET42 sounds reasonable from what a couple of people on here explain (although without photos it'd be a tricky decision to fork out all that money..).. Not sure if a square tyre like an AD08 would clear on the front though. It's easier to space out than retract in, however!

[JoeBoxer]

AD08's are bulky for their size if I remember correctly.

[ft_sjo]

Originally Posted by JoeBoxer

AD08's are bulky for their size if I remember correctly.

That's what i'm nervous about. I'm seeing if my wheel place can loan me a wheel/tyre for a trial fitment. My original plan was to put 225/45/17 AD08's onto my 7.5" wide wheels but my chassis guru states it'll probably move around too much (against my objective of more precise turn-in). So if i'm going to replace the wheels I may as well go the whole hog, hence the 245/40 route!

[gmookher]

Originally Posted by ft_sjo

That's what i'm nervous about. I'm seeing if my wheel place can loan me a wheel/tyre for a trial fitment. My original plan was to put 225/45/17 AD08's onto my 7.5" wide wheels but my chassis guru states it'll probably move around too much (against my objective of more precise turn-in). So if i'm going to replace the wheels I may as well go the whole hog, hence the 245/40 route!

is tracking and times the goal here?
I am not sure I agree with your chassis guru, and suggest you try the Right tire at the 225/45 size or even consider the Hoosier A6 or R6 in 225/40. Those are darn sticky and will work perfect on your 7.5 width rim

the 7.5 width has a weight advantage, as does the 225/40 Hoosier tires if times are your goal, its a 20 lbs tire. My 7.5" HLT rims are 15lbs each. thats a light wheel and tire setup that sticks.
most 8-9" rims come in at 17-18lbs, and tires can quickly approach 25-26 lbs, looking at the weight of a ideal 245 tire here

Thats 8 lbs more a corner, and 32 lbs total rotating weight. My car will be faster with the skinnier tires, I'm willing to bet.

http://www.tirerack.com/tires/tires....artnum=24ZR7A6

[CSG David]

Originally Posted by ft_sjo

That's what i'm nervous about. I'm seeing if my wheel place can loan me a wheel/tyre for a trial fitment. My original plan was to put 225/45/17 AD08's onto my 7.5" wide wheels but my chassis guru states it'll probably move around too much (against my objective of more precise turn-in). So if i'm going to replace the wheels I may as well go the whole hog, hence the 245/40 route!

You won't have issues rubbing with a 245/40 tire on a 9" +35 to +42. You should be more concerned about having too high of an offset which may cause you to rub the stock lower spring perch on the OEM shock. I've seen more than enough 245s on 9" wheels that have experience full suspension travel and full lock turns to say that you should be fine.

[driver01]

Originally Posted by ft_sjo

Anyone running a 245/40/17 all round?

Curious as to fit, standard or lowered ride height, and with what ET and tyre choice?

http://www.ft86club.com/forums/showthread.php?t=18471
Kw V3 Coilovers
Vorshlag camber plates
Cusco rear lower control arms
Whiteline rear adjustable lateral link arms
245/40R17 Yokohama Advan AD08
17 x 8.5 45offset 5x100
16.5lbs per wheel
Front camber negative 4
Rear camber negative 2
rubbing inside wheel wel under full lock or close to it.

[RazorHawk]

Hey, I was thinking, I like the look of all flush, but I do not like the look of staggered concave, and I want to be able to rotate my wheels and tires. What do you folks think of putting spacers only in the back, and running a full square setup?

EX: According to fitment chart, Stock height:
18x9, 48 offset perfect flush in front
18x9, 38 offset perfect flush in rear

If you would get a square set of 18x9 48 offset and get 10 mm spacers for the rear, would that work, and if so, does anyone have pics of this?

I might even want to do this with my stock rims, although going from +48 means that the car would need a 25 mm spacer in the front and a 35 mm (or 25mm and 10mm) spacer in the rear. I am not sure what kind of safety issues may crop up when you get into that range, and I am sure it would start affecting the way the car steers, likely adversely.

I welcome any input on this, but please don't start flaming me, I am just looking for information on this. This is the first car I have had that I have really done anything to (put a flowmaster muffler on a car, thats about the extent of my modding experience) so I came here to learn from those who know more than me.

I am a very mathmatical person, so if you can explain where I am messed up, or why something won't work in terms of the numbers, all the better!

[nix]

Your maths is right, and quality built spacers and studs will be fine. Just check your local state vehicle laws, a lot of insurance places won't cover damage if they find illegal spacers fitted.

Without spacers, 9+38 would work with a 1 inch drop and maybe 1.5-2 deg camber in the front.

[JoeBoxer]

Just stick with a 8.5 +38ish all around check my thread for pics.

[JoeBoxer]

9 +48 will probably hit the strut up front too

[RazorHawk]

Originally Posted by JoeBoxer

9 +48 will probably hit the strut up front too

Its listed on the fitment chart, thats where I got my numbers, does not say it works, but that is where the star is.

To start, I mainly would be interested in doing this with stocker rims in the spring when the summer wheels go back on.

What do you folks think of flush stockers?