245/40/17 or 245/45/17?

[Go Horns!]

Got new wheels and still can't decide on the tire size. I am running on stock springs with koni yellows, no spacers. Wheels are 17x8.5 Arc-8.

Has anyone used a 245/45/17 square setup before?

Added poll, but I reserve to the right to go against the grain.

[BMWCurves]

Got new wheels and still can't decide on the tire size. I am running on stock springs with koni yellows, no spacers. Wheels are 17x8.5 Arc-8.

Has anyone used a 245/45/17 square setup before?

Added poll, but I reserve to the right to go against the grain.

Nope, this here's a democracy, and you'll do as the majority pleases. Also I have no skin in the game but I would lean toward 245/40/17 since it is only about -1.5% small diameter front and back compared to stock vs 2.5%+ larger in a 245/45/17 tire.

[az3579]

245/40-17 is the correct profile for that setup. 45 is a taller profile and I believe it's considered an odd size. In addition, it's taller, and could potentially have fitment issues.

[danewilson77]

I'm a 245/45/18 guy.

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[ELCID86]

I'm running 235/40 on my square style 135s.


Thumbs, iPhone, TaT.

[slater]

I'm a 245/45/18 guy.

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don't you mean 245/40/18? (your sig does not lie? :) ) 245/45/18 would be HUGE...

peter

[az3579]

I went through this exactly same dilemma when I was last shopping for tires. The 245/45-18's were much cheaper, but... they are bigger and aren't the correct size (I would have had fitment issues since my car's low). It's the same deal with 17's; 245/40's are the correct size, even though I believe the 45's are cheaper, but they're a taller profile so it doesn't look right on the car (a LOT of tire) and throws the speed readings off quite a bit and the car is slower to accelerate slightly, though this is barely measurable.

[slater]

yeah, BP, but 245/45/18 is way too huge. even 245/40/18 that dane runs is quite a bit larger in diameter.

i ran OE M3 Contis for a bit (225/45/18 and 255/40/18) and while not hugely wide, they were 1" taller than stock in the rear and 0.9" taller than stock in the front. that also means you're raising your car 0.5" off the ground too. :)

peter

[danewilson77]

don't you mean 245/40/18? (your sig does not lie? :) ) 245/45/18 would be HUGE...

peter
Lol...
Probably.

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[az3579]

yeah, BP, but 245/45/18 is way too huge. even 245/40/18 that dane runs is quite a bit larger in diameter.

i ran OE M3 Contis for a bit (225/45/18 and 255/40/18) and while not hugely wide, they were 1" taller than stock in the rear and 0.9" taller than stock in the front. that also means you're raising your car 0.5" off the ground too. :)

peter


Sorry, I meant 245/40. Even the 245/40 is HUGE to me.

[Go Horns!]

Going 245/40/17. stephenkirsh confirmed that I will rub with 245/45/17. Thanks all.

[mko9]

I run 255/40R17 Nitto NT-01s for trackdays on a set of Apex ARC-8. Stock suspension, no issues with rubbing. I would be leary of 255/45, particularly if you are lowered. There is a thread about "meaty" tires with pics of cars on 17s.

http://www.zhpmafia.com/forums/showthread.php?15841-Show-me-17s-and-quot-meaty-quot-tires-Please

[az3579]

Going 245/40/17. stephenkirsh confirmed that I will rub with 245/45/17. Thanks all.

Perfect choice.

[squashman702]

HTR ZIII's in 245/40R17

http://i243.photobucket.com/albums/ff295/squashman702/Mobile%20Uploads/20150808_173601_zpsufmqh9bz.jpg (http://s243.photobucket.com/user/squashman702/media/Mobile%20Uploads/20150808_173601_zpsufmqh9bz.jpg.html)

[ZacharyMikel]

I'm on 18" ARC-8's so this may not help... I am at an 18x9.5 +35mm square setup. Tires are 235/40/18's. I *barely* had to roll all 4 fenders, and I am running about -.5 camber in the front and -1.5 in the rears. Zero rubbing whatsoever.


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[Go Horns!]

Got the rubber on this morning. 17x8.5 Arc-8, Hyper-black, 245/40/17 Continental DWS06. I am on stock springs, but I have about 115 pounds of 135s in the back seat and subwoofer box in the trunk. No rubbing or fit issues.

https://farm1.staticflickr.com/765/20607505261_b45bf57af3_z.jpg (https://flic.kr/p/xp1RmR)[/url] (https://flic.kr/p/xp1RmR)

https://farm6.staticflickr.com/5676/19978338944_1db5f41b24_z.jpg (https://flic.kr/p/wrqd8J) (https://flic.kr/p/wrqd8J)

https://farm1.staticflickr.com/647/19980035603_ce54cdb03c_z.jpg (https://flic.kr/p/wryUut)[url=https://www.flickr.com/photos/59501450@N04/] (https://flic.kr/p/wryUut)