So i dropped the wheels and tires off this morning for my buddy jack to mount the tires up for me. I'll be putting the wheels on later today and i'll take pictures.

you do understand that the 255/40/18 is taller than stock diameter and will throw off your speedometer and decrease your final drive ratio, right?

I would've gone 265/35. 245/40 would have been closest to stock diameter.

yes but I don't care

plus there is not that big of a difference between 245/40s and 255/40s the height is the same, the width is the only difference and stock tire height is 45, it's not going to affect it that much

It is an 18inch wheel, where the stock size is a 17inch, so the aftermarket diameter of the wheel and tire mounted will ultimately be slightly bigger than stock, but a 17inch wheel in a 45 tire isn't much smaller than an 18inch wheel in a 40 tire.

I don't think you quite understand the nature of sidewall height markings. The sidewall height, or "series" listed on the tire is determined by a ratio of sidewall height compared to tread width.

For example, a 40 series in a 205 width tire is going to have a significantly shorter sidewall than a 40 series in 255.

To get specific to your particular tires, a hankook ventus evo in the stock size (235/45/17) is 25.4" total height, while the tires you purchased in 255/40/18 have a total height of 26". That's over a half inch shorter than the stock tires and is more than enough to be noticeable.

Your rpms will be lower per mph than they used to be and your low rpm/off-the-line acceleration will be negatively affected as well. However, assuming you have enough hp to overcome the drag, you will have a higher top speed. :)

A 265/35/18 (25.3") or a 245/40/18 (25.7) would have been better choices from a gearing and speedo accuracy perspective. Most guys in the GR chassis WRX and STIs with 18x9.5s are running the 265/35s for that reason.

edit: all tire specs were found at tirerack.com
http://www.tirerack.com/tires/tires....10XL&tab=Specs

good info, thanks man!

the reason I went with a 40 size and not a 35 size, is because on my previous car I was running a 35 and it was a fairly rough ride. So i opted for the 40 instead of the 35 to have a little bit better ride quality...figuring a little bit more of a tire, a slightly better ride.

I never really thought about the speedo accuracy or any of the other technicalities, but that doesn't really bother me

I put my wheels and tires on last night, what a difference from the stockers running snow tires, like night and day. With the 255 tires the car feels like it is on rails.

Proper pictures soon to come, will post a quick cell phone pic later.

now you just need more power to make up for that extra rotating mass lol

:wink:

quick pic at the car wash today

http://a7.sphotos.ak.fbcdn.net/hphot..._8167055_n.jpg

Looking good.

Nit picking bothers me
 

To put your mind at ease about the speedo being off the difference between the readings of the 235/45R17 and the 255/40R18 is less then 3 MPH at 100 MPH. This is less then the underclock subaru uses on there vehicle speed sensor. All this means that if your speedo says your doing 65 and the limit is 65 you'll still clock under 65.

thanks for clarifying sparrow!

im kinda an open guy, but this just isnt doing it for me. I love the car, but imo you shoulda gone with gold or white, and a musto dropp it soon.
but im glad you like it! all that matters

Wheels look good!

Wheels look good, would look better with a 35 series but thats just me. Hopefully a drop is coming soon lol

Looked pretty amazing in person. Way more aggressive. I'll post some more pics up later:

http://farm6.static.flickr.com/5104/...7100bc03_z.jpg

http://farm3.static.flickr.com/2779/...58f6eda7_z.jpg

yea but i didn't want a lack of ride quality

....annnndddd one before bed:

http://farm4.static.flickr.com/3286/...336d4198_b.jpg

Jeremy thats a badass picture, thanks again for taking them I really appreciate it