275/40/20 at all 4 Corners on an EX?

Discussion of Infiniti's amazing (and underrated) sport-luxury crossovers, the EX35 and EX37. For 2014, the EX series will be renamed QX50, in line with Ininfiit's new naming conventions.
OhThatGuy
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275/40/20 at all 4 Corners on an EX?

Postby OhThatGuy » Sat Dec 29, 2012 6:52 pm

This tire size is 3.22% larger in overall diameter and eats up a bit of wheel well gap (1.165 cm) while increasing the ride height by the same amount. I am running 285/35/20's on back right now with no issues and I've tried the GTR fronts with 255/40/20's for a test fit on the front of the EX and it seemed fine. Any thoughts on how 275/40/20's will look or fit at all 4 corners on an EX?
Last edited by OhThatGuy on Mon Dec 31, 2012 1:45 pm, edited 1 time in total.


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Re: 275/40/20 at all 4 Corners on an EX?

Postby RED_DET » Sun Dec 30, 2012 12:14 am

Normally you want to stay within 3% difference +/- overall diameter. You are right on the border so shouldn't be any issues except the speedometer reading.

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Re: 275/40/20 at all 4 Corners on an EX?

Postby jmann » Mon Dec 31, 2012 10:36 am

If you are RWD you can leave different sized wheels on the back (or front) with no issue. If you are AWD, you should be running all 4 wheels the same size or you could damage your transmission. In no case should you have different sized wheels on the right/left sides, this could also damage the differential(s).

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Re: 275/40/20 at all 4 Corners on an EX?

Postby OhThatGuy » Mon Dec 31, 2012 1:45 pm

Thanks for the info. I'm RWD and will have the exact same size wheel/tire at each of the 4 corners but they'll be 3.22% bigger in diameter than the stock size.

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Re: 275/40/20 at all 4 Corners on an EX?

Postby OhThatGuy » Thu Jan 03, 2013 4:48 pm

I bit the bullet and will give this size tire a shot. Props to Tread Depot for the screaming deal on a set of these Toyo Proxes 4 Plus tires in 275/40/20. The whole set was only $632 before shipping!

Image

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Re: 275/40/20 at all 4 Corners on an EX?

Postby parkstr8r » Mon Jan 07, 2013 8:32 am

Pics afte the install, please!!

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Re: 275/40/20 at all 4 Corners on an EX?

Postby OhThatGuy » Mon Jan 07, 2013 7:25 pm

Boom!

Got the other 2 GT-R wheels along with 275/40/20 Toyo Proxes 4 Plus tires all around today. Results in about 1.1 cm increase in ride height (not good) but with 1.1cm less wheel well gap (very good). Plus the tires are 10 lbs. lighter EACH than the GT-R's Dunlop runflats that were on there. You can really feel this huge drop in unsprung weight.

The steering sensation is also a bit different. I went from running the OEM 18's and tires to these Toyos without ever having the wider wheels/ runflats on the front. So the unsprung weight on the front 2 stayed almost identical but the side wall height dropped and the contact patch got much bigger. It should have dialed out a lot of understeer from where it was.

The switch to the 275's from the 285 Dunlops in the rear really cleaned up all of the excess poke also. These are pretty darn close to perfect flushness now. The super soft compound GT-R OEM summer tires also threw a lot of gravel up into the wheel wells. We'll see if that is reduced any with this different, high performance all season compound.

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Last edited by OhThatGuy on Sat Jan 12, 2013 5:24 pm, edited 3 times in total.

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Re: 275/40/20 at all 4 Corners on an EX?

Postby EX-KAT-35 » Mon Jan 07, 2013 8:21 pm

Looks really good. The two-tone wheels are almost invisible unless someone is orbiting the car. :woot:
I've seen a few european tuner cars that sported ENTIRELY different wheels on each side. :mike

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Re: 275/40/20 at all 4 Corners on an EX?

Postby OhThatGuy » Mon Jan 07, 2013 8:36 pm

Thanks, Kat! I'm really hoping that it doesn't become something that bothers me. For now, I'm just excited to not have the completely wrong front/ back arrangement that has been on there for weeks. :chuckle:

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Re: 275/40/20 at all 4 Corners on an EX?

Postby XIS » Tue Jan 08, 2013 12:23 pm

gorgeous

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Re: 275/40/20 at all 4 Corners on an EX?

Postby parkstr8r » Tue Jan 08, 2013 2:12 pm

I have FX20's on my EX now...running 255/45-20 in rear and 245/45-20 in front. I get very slight rubbing over speed bumps and small declines in pavement.

It's been bugging me...so i just bought some Yokohamas in 255/40-20 for all corners. Hope that .25" will make the difference.

Yours looks great.

I'm having the hardest time finding a 20" wheel that is butch and concave and 5 spoke all at the same time.

I might have to swipe your idea!

OhThatGuy
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Re: 275/40/20 at all 4 Corners on an EX?

Postby OhThatGuy » Tue Jan 08, 2013 7:37 pm

parkstr8r wrote:I have FX20's on my EX now...running 255/45-20 in rear and 245/45-20 in front. I get very slight rubbing over speed bumps and small declines in pavement.

It's been bugging me...so i just bought some Yokohamas in 255/40-20 for all corners. Hope that .25" will make the difference.

Yours looks great.

I'm having the hardest time finding a 20" wheel that is butch and concave and 5 spoke all at the same time.

I might have to swipe your idea!
Do it-go GT-R. You'll dig it. I did have my first rubbing issue today. I had 3 passengers and myself out to lunch and we crossed a street with a big up down elevation change where the edge of the streets meet and it made a slight rubbing sound up front when it compressed for just a second. It wasn't loud or harsh so I don't think it is much of an issue on this set up.

The increased ride height is bugging me so I want to find stiffer springs that won't compress beyond the low point of my current set up and also won't drop the car more than 1-2 cms. Not sure that exists but I need to find them.

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Re: 275/40/20 at all 4 Corners on an EX?

Postby EXceptional » Thu Jan 10, 2013 3:54 am

Nice looking ride !

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Re: 275/40/20 at all 4 Corners on an EX?

Postby OhThatGuy » Sat Jan 12, 2013 3:44 pm

EXceptional wrote:Nice looking ride !
Thanks, I found my SLR camera today and took a bunch of snaps. Blurry cell phone pics have been swapped with some from today's session in the post above.

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Re: 275/40/20 at all 4 Corners on an EX?

Postby R2urbo » Thu Aug 09, 2018 7:57 pm

parkstr8r wrote:
Tue Jan 08, 2013 2:12 pm
I have FX20's on my EX now...running 255/45-20 in rear and 245/45-20 in front. I get very slight rubbing over speed bumps and small declines in pavement.

It's been bugging me...so i just bought some Yokohamas in 255/40-20 for all corners. Hope that .25" will make the difference.

Yours looks great.

I'm having the hardest time finding a 20" wheel that is butch and concave and 5 spoke all at the same time.

I might have to swipe your idea!
are you still rubbing with 255/40/20?


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