20x10 front wheel offset?

gozfast · 12-21-2010, 02:33 PM

I'm upgrading from the 19" sports and want to add some more tire under the front. It seems that the consensus around here is that a 9.5" wide rim with a 255 tire sits about perfect with a +22 offset in the front. That puts the face of the rim out +31mm from the stock fitment using a wheel offset calculator. So... If I use a 10" wide wheel instead, with a +35 offset, it will put the face of the rim out 25mm from stock and the rear space at 1mm less than stock. Using a 275/30 front tire instead of a 255 adds 20mm to the overall width, but with the 0.5" greater rim width (10" vs 9.5") it adds up to only 4mm wider per side. Therefore, if I'm 25mm out and +4mm on the tire, that equals 29mm total out on the face. That is almost exactly the preferred 31mm stated before. If my math's correct, why do so many people say a 275 tire is tough to fit up front? I definitely can't lower the car due to the roads around here, and I don't want to change camber settings just to fit something that "looks" good. I still want this thing to handle great like it was meant to. That's primarily why I want to run a more square 275 front / 285 rear tire setup. I'm planning a 20X10.5 +15 rear rim to match the front. Are my offset calculations correct before I order the new wheels?

ChrisSlicks · 12-21-2010, 03:07 PM

Your math sounds about right. I didn't have any problem with a 275 on the stock wheel or on a 10" +24 wheel.

98intrigue · 12-21-2010, 03:26 PM

I have a 20"x10" +31 up front with a 275/35/19 tire, with no rubbing issues. The front sits pretty flush.

Fly1 Motorsports · 12-21-2010, 04:36 PM

Quote:

Originally Posted by 98intrigue

I have a 20"x10" +31 up front with a 275/35/19 tire, with no rubbing issues. The front sits pretty flush.

Looks great!

WheelTrends · 12-22-2010, 12:45 PM

Looks good in my books....

bullitt5897 · 12-22-2010, 01:06 PM

Also remember just because it says 275 does not mean it is 275 wide... Each wheel model and brand has different tread widths and you must prepare your sizing to the tire width you are most likely going to use I.e. 305 Toyo r888's are much wider than 305 Falken fk452's!!! So please find the actual tread width from the manufacturer website of the tires you wish to use. This will help you push the limits without going too far.

Like everyone else has said a 10 +21 or higher will be just fine

W.O.W. 370Z · 12-22-2010, 01:10 PM

Toyo R888 and Falken 452 dont share any common 305 sized tires...

bullitt5897 · 12-22-2010, 03:03 PM

diameter does not matter when it comes to section/tread width... still the point is valid one tires 305 does not equal another tires 305 across brand or across model lines. simply stated one must take this into account when trying to push the limits on offsets and fitment.

Stealth_Z · 12-22-2010, 03:25 PM

Quote:

Originally Posted by 98intrigue

I have a 20"x10" +31 up front with a 275/35/19 tire, with no rubbing issues. The front sits pretty flush.

so so so sexy!!! You need center caps now!!!
SSR Wheels - Motorsports

12-21-2010, 02:33 PM	#1 (permalink)
gozfast Base Member Join Date: Mar 2010 Location: Earth Posts: 67 Drives: 370Z Sport Rep Power: 15	20x10 front wheel offset? I'm upgrading from the 19" sports and want to add some more tire under the front. It seems that the consensus around here is that a 9.5" wide rim with a 255 tire sits about perfect with a +22 offset in the front. That puts the face of the rim out +31mm from the stock fitment using a wheel offset calculator. So... If I use a 10" wide wheel instead, with a +35 offset, it will put the face of the rim out 25mm from stock and the rear space at 1mm less than stock. Using a 275/30 front tire instead of a 255 adds 20mm to the overall width, but with the 0.5" greater rim width (10" vs 9.5") it adds up to only 4mm wider per side. Therefore, if I'm 25mm out and +4mm on the tire, that equals 29mm total out on the face. That is almost exactly the preferred 31mm stated before. If my math's correct, why do so many people say a 275 tire is tough to fit up front? I definitely can't lower the car due to the roads around here, and I don't want to change camber settings just to fit something that "looks" good. I still want this thing to handle great like it was meant to. That's primarily why I want to run a more square 275 front / 285 rear tire setup. I'm planning a 20X10.5 +15 rear rim to match the front. Are my offset calculations correct before I order the new wheels? Last edited by gozfast; 12-21-2010 at 03:04 PM.

12-21-2010, 03:07 PM	#2 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	Your math sounds about right. I didn't have any problem with a 275 on the stock wheel or on a 10" +24 wheel. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

12-21-2010, 03:26 PM	#3 (permalink)
98intrigue A True Z Fanatic Join Date: Jul 2010 Location: Clearwater, FL Age: 38 Posts: 4,855 Drives: 2014 Viper Rep Power: 429	I have a 20"x10" +31 up front with a 275/35/19 tire, with no rubbing issues. The front sits pretty flush. __________________ Ryan - 2014 Stryker Green Viper Gone - a few Vipers and a couple turbo VQs

12-22-2010, 12:45 PM	#5 (permalink)
WheelTrends Base Member Join Date: Jun 2010 Location: Miami Posts: 20 Drives: 07 350Z Rep Power: 14	Looks good in my books.... __________________ AUTHORIZED DEALER : - ISS FORGED, Forged Specialties, Strasse Forged AND MANY MORE.. WWW.WHEELTRENDS.COM

12-22-2010, 01:06 PM	#6 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3682	Also remember just because it says 275 does not mean it is 275 wide... Each wheel model and brand has different tread widths and you must prepare your sizing to the tire width you are most likely going to use I.e. 305 Toyo r888's are much wider than 305 Falken fk452's!!! So please find the actual tread width from the manufacturer website of the tires you wish to use. This will help you push the limits without going too far. Like everyone else has said a 10 +21 or higher will be just fine __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

12-22-2010, 01:10 PM	#7 (permalink)
W.O.W. 370Z A True Z Fanatic Join Date: Mar 2010 Location: Miami Posts: 1,757 Drives: 2010 Touring Sport Z Rep Power: 19	Toyo R888 and Falken 452 dont share any common 305 sized tires...

12-22-2010, 03:03 PM	#8 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3682	diameter does not matter when it comes to section/tread width... still the point is valid one tires 305 does not equal another tires 305 across brand or across model lines. simply stated one must take this into account when trying to push the limits on offsets and fitment. __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

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