285 series or larger front tires on DD-chime in

[2013DIBGT]

Hello,

I was curious to here from those who run a 285 or larger front tire and what your opinion is on how they behave in day to day driving on the street.

At some point I am intending to replace my factory Brembo wheels on my 2013 GT with 18" wheels and am contemplating going with either a 10 or 10.5" wide rim.

My thought is that a 10" wide rim running in a square setup using a readily available tire size like the 285 might make the most sense in terms of tire choices, cost and availability but the problem is that the rims I am most interested in are 10.5" wide so this would force me to run a 295 or bigger tire if I want to keep within the manufacturer recommended rim size as found on Tirerack.

I have heard some stories of folks running wider tires like the 285 or bigger on the front having issues with tramlining on the street but am unsure if that is more related to the brand and design of the tire more then the width.

I am using Cortex coilovers with the offset dampers which are designed to handle up to 315mm wide tires on all four corners so fitment shouldn't be an issue with 18" wheels.

From what I have researched thus far the tires choices are fairly slim in the 295mm range but jump up in availability (and cost) in the 315mm wide range. Right now the 3 tire brands I would like to stick with in order of preference are:

Michelin Pilot Super Sports (seems like best choice for a street tire, especially in the rain)
BRIDGESTONE POTENZA RE-11
BFGoodrich Rival

I guess the main question would be if anyone has used a 285x35x18 width tire with success on a 10.5" wide rim without it looking ghetto/stretched or just plain wrong assuming the use of a proper wheel offset. The 285x18 size certainly seems to have the motherload of choices and cheap cost but will it work correctly on a 10.5" wide rim?

The top wheels on my list at the moment are the Jongbloed Series 700 in a +45mm offset @ 18x10.5" size. The runner up in the 10" wide rim category would be the Forgestar F14 offered thru Vorshlag.

Thanks for any opinions you can provide

 

[KrisR]

I have an 18x10 / 285/40-18 square setup and it drives perfectly. I don't get tramlining or any other issues. I run the 18x10 Played Out SVE Drifts in 43mm offset and Nitto 555 tires. They are 3 lbs heavier than the OEM 18x8 235/50-18 setup which I think is negligible.

Pics here. http://www.s197forum.com/forum/showpost.php?p=1886924&postcount=491

 

[2013DIBGT]

Car looks real clean, I should have gotten white damnit

Thanks for posting your experience with the tires.

 

[csamsh]

If it was still a DD, I would have zero problems DD'ing my 18x10's w/285/35/18 setup. Very well-mannered on the street. The 275/40/18 RE11 on an 18x10 would be a pretty great DD setup I think.

 

[cbass]

I had 18x10 with 285/40 goodyear f1's this summer, no problems. Need new tires, and I want different wheels for next year, but I would happily run it again.

 

[Sky Render]

My autocross setup is 18x10 AMRs on all 4 corners with 285 Goodyear tires. They rub only at full steering lock.

 

[Zodiac]

I have 18x10 with 285/40 all around. No problems at all. Curious guys what do you run your psi with these setups?

 

[2013DIBGT]

Thanks for the info folks. Sounds like 285 is a good option.

I will keep an eye on the thread to hear if anyone has run larger than 285 series tires on the front and what their experience is with that setup.

 

[csamsh]

Thanks for the info folks. Sounds like 285 is a good option.

I will keep an eye on the thread to hear if anyone has run larger than 285 series tires on the front and what their experience is with that setup.

315's on the front are ROUGH on the street. They have minds of their own, and will follow any little rut they find.

 

[Black3vGT]

285/35 19's on all 4 here. No problems drives fine.

 

[KrisR]

Thanks for the info folks. Sounds like 285 is a good option.

I will keep an eye on the thread to hear if anyone has run larger than 285 series tires on the front and what their experience is with that setup.

I know that some people have run 295/40-18s front and rear (Falken Azenis I think?) also on daily driven street setups.

 

[2013DIBGT]

So below I am noodling thru some numbers based on my first choice tire at a very common/available size to see how it will work on a rim that is 1/2" wider than what the industry says is the ideal size but at the same time this 1/2" wider rim still falls within the Max recommended rim width range for said tire.

Base numbers taken from Tirerack:

285 x 35 x 18 Michelin PSS
Rim Width Range. 9.5-11"

Base #'s
Meas. Rim Width: 10" (claimed ideal width)
Section Width: 11.4" (based on claimed ideal width,not loaded,but inflated)
Tread Width: 10.2"

New Rim
New Rim Width: 10.5"
New Section Width: 11.6" (+ 2/10" to account for .5" increase in rim width)
Tread Width: 10.2"

As I sit here and look at the base numbers above focusing on the "Section Width" value it appears that according to the experts they are wanting to see a tire bulge that is about .75" wider per side then the rim width is to be considered ideal.

Now looking at the new rim and how it changes the Section width of the same tire I see that I would end up with a little over .50" of tire bulge per side of the total rim width.

Thus far I haven't taken into consideration the amount the tire will compress once loaded with the vehicles weight and to keep things simple I will choose to ignore that and not muddy the waters any further then I have already.

So what I am trying to understand is if the goal of these manufacturer recommendations for Section width and Rim width are to account for tire rollover under cornering situations so that the rims edge never ends up in such a way that it is situated further out then the outer or inner tire edges?

If the above is correct it would seem that the tire sidewall stiffness would play a key roll in how much of that "Bulge" it needs to use in hard cornering situations and that tire choice may allow someone to get away with using a rim that is a little wider then the recommended ideal according to the manufacturer of the tire.

Please post your thoughts on this..Thanks

 

[Norm Peterson]

I don't think I'd go so far as to say that a tire's "measuring width" wheel is ideal for anything other than the measuring purpose. It may be ideal as overall consideration of ride, handling, clearances, and whatever else for the average driver, but that isn't likely to make it ideal for the apparent hard-cornering purposes of this thread.

There is no need to have to go up to 295-wide tires if you've settled on 10.5" wide wheels (and have done your research regarding fit). Tires as narrow as 265/40 and 265/35 are still OK'ed for 10.5" wheels, so 285/35's on 10.5" is clearly an acceptable combination.

I've been running tires out around the tabulated max width off and on for 40 years. Sometimes right on the max, sometimes 1/2" less than max, sometimes even 1/2" wider than max.

For 2008, Ford put the 235/50-18 tires on 8.5's (max width) for the GT, and 255/45-18's on the GT500's 9.5's (max width again). The 1LE Camaro rear wheels are 11's for their 285/35-20's (wheel diameter is irrelevant as far as wheel width to tire size matters are concerned).

If you can fit the wide wheel combination, can live with a possible increase in tramlining, and don't mind the mildly stretched appearance there really isn't a problem, is there?

FWIW, I'm looking at 285/35-18's for track/autocross duty plus maybe the travel to/from. Not looking at less than 10.5's.


There is a standard for establishing the "measuring width" wheels that's based on tire profile. Tire "bulge" sort of falls wherever it lands.

Tires of 50 profile and up are measured on wheels that are 70% as wide as the tires' section width. 45 series and down are measured on wheels that are 85% as wide as the tire section widths.

FWIW #2

For tires with aspect ratios of 50 to 80 the factor is 0.70. For tires with aspect ratios less than 50 the factor is 0.85.

http://www.ehow.com/how_7479636_size-tires-rim-width.html - you may have to scroll to the right a couple of pages.


Norm

 

[BruceH]

I think it depends on local road conditions. At one time I ran a square setup of 275/40/18 tires on GT500 wheels and had to change them due to the tramline experience on the local highways. Most of the local highways are rutted from people running studded tires from November to April.

What I'm saying is if you have ruts then think twice about it.

 

[2013DIBGT]

Thanks for the additional info guys, its been very helpful!

I am going to plan on running the 285 x 35 x 18 Michelin PSS and see how it goes. Worst case scenario will be that I maintain a Kung Fu grip on the steering wheel at all times

 

[Shotokan1509]

I think it depends on local road conditions. At one time I ran a square setup of 275/40/18 tires on GT500 wheels and had to change them due to the tramline experience on the local highways. Most of the local highways are rutted from people running studded tires from November to April.

What I'm saying is if you have ruts then think twice about it.

A lot I believe is the tire itself as well..

My 255F 295R Falken Azenis tramlined pretty badly, when I widened the front & squared it out to 275's Cooper Zeon RS3's all around it helped reduce

 

[frank s]

I ran 275-35-19 Michelin PS2s on nine-inch fronts and experienced noticeable but not intolerable tramlining.

Running 285-40-18 Goodyear F1sThe cheap ones) on GT500 9.5-inch rims all around, no important tramlining at all.

Looks to me as if the tire design was important in these comparisons, rather than the width.

 

[BigRed06GT]

My 285/35-19 Bridgestone S-04's don't tramline one bit.

 

[Morris]

I also run a square 285 set up on 19x10s with no issues. Offset is a 43.

 

[claudermilk]

My 285/35-19 Bridgestone S-04's don't tramline one bit.

Same here.