IS-F Wheel best fittment???

chinkzzz · 2008-12-05

I'm looking into changing the rims for my F... just wondering whats the best fittment for it? front and rear??

Gymkata

· #21 · Feb 2, 2010

Discount Tire Direct said:
The sizes you list are certainly the closest to OE rolling diameter. I can tell you that a 19x9 with a 45mm offset will not rub on the front running a 255/35-19. On the rear, 19x10.5 with a 60mm offset will not rub with 295/30-19. Some people prefer a tire with a little more meat on the sidewall. Anything below 3% is acceptable on the IS-F.

Holy Crap!!! You don't even know how much searching I have been doing to try and find someone who will verify which offsets on these wheel sizes will clear those exact tire sizes. I guess I didn't look back far enough.

I called HRE today to try and figure out what they recommend. They recommended those same sizes, but said that the exact wheel backspacing was proprietary information and would not be given out.

When you said that these sizes won't rub, did you test them under extreme cornering with max body roll? Also, if I went with a coilover setup later that lowered the ISF by about an inch, would these sizes still clear without any rubbing?

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Gymkata

· #22 · Feb 2, 2010

Is anybody here running these size wheels, tires, and offsets? If so, can you confirm that this is the correct offset with no rubbing? Thanks in advance.

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Gymkata

· #24 · Feb 2, 2010

Thanks A Lot

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Gymkata

· #28 · Feb 28, 2010

Discount Tire Direct said:
The sizes you list are certainly the closest to OE rolling diameter. I can tell you that a 19x9 with a 45mm offset will not rub on the front running a 255/35-19. On the rear, 19x10.5 with a 60mm offset will not rub with 295/30-19. Some people prefer a tire with a little more meat on the sidewall. Anything below 3% is acceptable on the IS-F.

Will these sized tires and wheels still fit without rubbing if a coilover suspension is used, lowering the car by an inch or less?

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Gymkata

· #52 · Sep 7, 2010 (Edited)

Silver88 said:
Hi,

I need to spec out sizes for some Work Varianza T1S wheels.

I would like to run 19" with a 245/35/19 and 275/30/19 set up.

Which rim sizes and offset would be recommended on a stock suspension set up?

Sorry, I tried to post a Work Wheels spec sheet, but too new to post URLs. Thanks in advance.

Below is the recommended wheel/tire fitment guide from discount tire direct that has been posted in many different threads. As far as I know, every combination here works on the ISF without rubbing of any kind. According to below, in order to run a 245/35R19 front, you could use an 8 inch rim (+29to+59 offset), 8.5 inch rim (+35to+52 offset), or a 9 inch rim (+41to+46 offset). In order to run a 275/30R19 rear, you could use a 9 inch rim (+39to+65 offset), 9.5 inch rim (+45to+65 offset), 10 inch rim (+52to+65 offset), or a 10.5 inch rim (+58to+60). I listed 275 as fitting on a 9 inch rim, because I am running 275/30R19s on the stock rear 9 inch rims right now without problems. With all of these wheel widths, the narrower the wheel the greater number of offset options. Also, though it might fit, I would not recommend putting a 275 on a 10.5 rim. Of course I have my bias as I hate the stretch look. I like fitting the widest tire possible on a rim, not the the reverse.

FRONT
WHEEL WIDTH OFFSETS WIDTH OF TIRE
7.0 +16/+65 225
7.5 +22/+65 225/235
8.0 +29/+59 225/235/245
8.5 +35/+52 235/245/255
9.0 +41/+46 245/255/265

REAR
WHEEL WIDTH OFFSETS WIDTH OF TIRE
8.0 +26/+65 225/235/245
8.5 +33/+65 235/245/255
9.0 +39/+65 245/255/265
9.5 +45/+65 255/265/275
10.0 +52/+65 265/275/285
10.5 +58/+60 275/285/295

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Gymkata

· #53 · Sep 7, 2010 (Edited)

http://www.workwheelsusa.com/media/wheels/24/50/Varianza T1S_SPEC10A1.pdf

I know you stated 245 front and 275 rear, but you can definitely go wider if you like...at least 255/295. Having the right offsets are critical the wider you go.

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Gymkata

· #55 · Sep 8, 2010 (Edited)

If you were to go with a 20 inch wheel, the offsets would be the same for each width. Most of the tire widths would still be applicable, but you would need to check with an expert first. I assume the less the sidewall, the less room you have to vary tire widths and still seat the tire properly.

As far as tire sizes, 245/30R20s are about 25.8 inches tall. For the rear, 275/30R20s are about 26.5 inches tall, while 275/25R20s are about 25.4 inches. I would opt for the latter personally, as I would prefer a slightly shorter rolling radius vs a slightly longer rolling radius. The stock tires are right around 26 inches tall.

Realize if you go with a 20 inch wheel, you will be increasing unsprung weight/lowering performance...at the expense of a little bling bling. Many prefer this as it does look nice, but personally, I am considering going with an aftermarket set of 18s for weight saving purposes.

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Gymkata

· #58 · Sep 9, 2010

As long as you are only planning on running 245 & 275, and not wider, I would recommend the 8.5 and 9.5 inch wheels. They will be a little bit lighter, and I see no reason for the extra rim width running those tire widths. Both sets of wheel offsets you listed will work according to Discount Tire Direct's list of ranges. Just make sure you get wheels with a 5X114.3 lug pattern, not something else by mistake.

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Gymkata

· #59 · Sep 9, 2010 (Edited)

You know, if you got the 19x9 front and 19x10 rear wheels, you could run Continental ExtemeContact DW tires in 255/35R19 fronts and 285/30R19 rears. These sizes would be very close to stock, and would give 30mm wider rubber front and rear over stock. The Continental DW's are a great Max Performance summer tire, that have done well in comparisons to the Pilot Sport PS2s, but have a lot longer tire life, and are much less expensive. Having a 255 up front should help kill understeer as well.

So I guess that is my recommendation: 245/275 with 8.5/9.5 or 255/285 with 9.0/10.0

You should be able to fit a 295/30R19 on a 10 inch rim as well. I don't know if it would rub or not though. If it did, it would be minor, and rolled fenders should easily solve it.

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Gymkata

· #61 · Sep 14, 2010

Discount Tire Direct uses a machine to calculate exactly what will fit with each wheel width & offset and tire width. According to their chart, yes, your combination will work.

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Gymkata

· #64 · Sep 24, 2010 (Edited)

Hint: To everybody who has wheel/tire fitment questions - The below chart created by Discount Tire Direct is easy to understand...

X20A, according the the chart, you can go up to a 265 width in front (I don't know anybody running this on the street though). You can go up to 295 in the rear (There is at least on guy running 305s with stock fenders).

Probably the most recommended max width wheel/tire combo would be 255/35R19s on 19x9 +41 to +46 offset and 295/30R19s on 19x10.5 + 58 to +60 offset. I'm sure you could also fit the 295 tire on a 10 inch wheel.

See post #59 from this thread, it also has a few wheel/tire recommendations.

FRONT
WHEEL WIDTH OFFSETS WIDTH OF TIRE
7.0 +16/+65 225
7.5 +22/+65 225/235
8.0 +29/+59 225/235/245
8.5 +35/+52 235/245/255
9.0 +41/+46 245/255/265

REAR
WHEEL WIDTH OFFSETS WIDTH OF TIRE
8.0 +26/+65 225/235/245
8.5 +33/+65 235/245/255
9.0 +39/+65 245/255/265
9.5 +45/+65 255/265/275
10.0 +52/+65 265/275/285
10.5 +58/+60 275/285/295

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Gymkata

· #65 · Sep 24, 2010 (Edited)

When I finally decide to get aftermarket wheels, I may get 18s for weight savings purposes. I would get 18x9 fronts and 18x10 rears, and run Continental ExtremeContact DW tires, 265/40R18 (26.3"tall) front and 295/35R18 (26.1" tall) rear. Of course I will have to make sure that the wheels are designed to clear the brakes. Using an ultra lightweight monoblock forged wheel, this combination would save over 30 lb overall from the stock wheels and Bridgestone tires, and have 40mm (!!!!) more width all around...talk about helping to kill understeer.

If anybody wanted to MAX out width, you could go with 19x9 front with 265/35R19s (26.3" tall) and 19x10.5 rear with 305/30R19s (26.2" tall). Rolling the rear fenders might be necessary, but DAMN, 305s would be great in the rear.

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Gymkata

· #67 · Sep 25, 2010

lowrider said:
305/30 has been done by FIGS. I'm running 285/30 on the rears with my stockers. The first two picts are FIGS, the last two are mine.

Lou

How do you feel about the dry grip of the Continental DWs? I'm pretty sure they are going to be the tire I use when I get aftermarket rims (who knows when). From what I can tell, and from my experience with the DWSs, the DWs are the best overall Max Performance Summer tire if you factor in performance, tire life, and cost.

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Gymkata

· #73 · Sep 3, 2011

D.I.M. said:
so guYs! I want to buy some sexiest wheels in nearest future! I have tyre 245/35 and 275/30 R19! which ET i should have without rolling my fenders. Soon i will buy KW Coilovers))

Below are a few possibilities from Discount Tire Direct's fitment guide. I would recommend 8.5" front +35 - +52 and 9.5" rear +45 - +65 if you never plan to go wider than 245 and 275. If you might want to go wider, go with 9.0" front +41 - +46 and 10" rear +52 - +65. If you went with a 9" front and 10" rear you could run 255 and 295 in the future.

FRONT
8.0 +29/+59 225/235/245
8.5 +35/+52 235/245/255
9.0 +41/+46 245/255/265

REAR
9.0 +39/+65 245/255/265
9.5 +45/+65 255/265/275
10.0 +52/+65 265/275/285

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Gymkata

· #77 · Sep 7, 2011

I'm not an offset expert, but as long as you get the right offset, you could run 295/30R19 tires on the rear without trimming with a 10" or 10.5" rim. I didn't recommend a 10.5" rear to you in the previous post because I personally think a 275 would look absolutely retarded on it (I HATE the stretched look).

Probably the best setup for a street ISF is 19x9 fronts and 19x10.5 rears, running 255/35R19 and 295/30R19 tires. I'm just personally sick of seeing so many ISFs out there running heavy 20x11 rears and only putting a 285mm tire on it.

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Gymkata

· #81 · Sep 16, 2011

D.I.M. said:
but if it will be 19x9 - +38 - 245-35-19
19x10 - +45 - 275-30-19???????

19x10 + 45 in the rear will be close with 275/30R19. My guess is it will be okay, but you may need to trim just a little or roll.

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