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Ideal track tire width for 9.5" wheel?

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Old Feb 6, 2012 | 12:51 PM
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Default Ideal track tire width for 9.5" wheel?

Hi,

I was wondering what is the ideal width for tires on a 9.5"?

As far as i can tell you can fit anything between a 245-285 on a 9.5"

I'm thinking a 245 is a little too small and a 285 is too big.

You would want something that would let your sidewalls sit vertical/flush with your wheel width to maximize stiffness correct? would that be a 265? or 275?

Thanks
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Old Feb 6, 2012 | 02:12 PM
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265 or 275 works great
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Old Feb 6, 2012 | 02:18 PM
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Join Date: May 2005

After 7 years you should be helping new members with wheel and tire selection.
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Old Feb 6, 2012 | 02:34 PM
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Originally Posted by dreamspeed
You would want something that would let your sidewalls sit vertical/flush with your wheel width to maximize stiffness correct? would that be a 265? or 275?
This. If you look at the manufacturers specs on their tires, they normally list a min to max wheel width range and a "measured" value. That is typically their optimal wheel width and the one that the posted specs (width, tread width, sidewall height, etc.) are measured on.

Last edited by DavesZ#3; Feb 7, 2012 at 03:09 AM.
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Old Feb 6, 2012 | 02:38 PM
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I would personally use 265s for the front on a 9.5" wheel. I had 285s on my 19x9.5 Nismo wheels, and they're a little bluged. 275 is more than likely what you're looking for.

Last edited by angelo350z; Feb 6, 2012 at 02:40 PM.
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Old Feb 6, 2012 | 02:41 PM
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Originally Posted by davidv
Join Date: May 2005

After 7 years you should be helping new members with wheel and tire selection.
How does this help?
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Old Feb 6, 2012 | 08:01 PM
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was looking at the nitto nt05s

I guess the middle bracketed size is the ideal size for these then.

265/35ZR18 97W - 9.0-(9.5)-10.5

275/35ZR18 99W - 9.0-(9.5)-11.0

http://www.nittotire.com/Tire/nt05#size
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Old Feb 6, 2012 | 08:46 PM
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Originally Posted by dreamspeed
was looking at the nitto nt05s

I guess the middle bracketed size is the ideal size for these then.

265/35ZR18 97W - 9.0-(9.5)-10.5

275/35ZR18 99W - 9.0-(9.5)-11.0

http://www.nittotire.com/Tire/nt05#size
275/35ZR18: Actual speed 100.0 MPH. Speedometer will read 104.3 MPH. Is this what you want?

Last edited by davidv; Feb 7, 2012 at 03:38 AM.
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Old Feb 6, 2012 | 08:52 PM
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Originally Posted by dreamspeed
Hi,

I was wondering what is the ideal width for tires on a 9.5"?

As far as i can tell you can fit anything between a 245-285 on a 9.5"

I'm thinking a 245 is a little too small and a 285 is too big.

You would want something that would let your sidewalls sit vertical/flush with your wheel width to maximize stiffness correct? would that be a 265? or 275?

Thanks
I think the choice of RIM WIDTH comes first and is the most important factor.
In some cases, using the SMALLEST approved tire width for a well chosen rim width (9.5s up front) has it's advantages. For example, up front I have Cooper Zeon RS-3S 245/40s on 9.5s and the sidewalls are stiff as hell. Those are the smallest tires approved for that rim. Sharp turn in and minimal flex (cornering stability) are the benefits of using such a set up on the fronts. The wider the tire you use for a given rim width, the more it will flex and that *could* result in inferior handling. Wider tires are usually a great choice, but are not always the best option...especially up front.

Last edited by ronn1; Feb 6, 2012 at 09:00 PM.
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Old Feb 6, 2012 | 10:27 PM
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^Good point but there's a downside: The wider rim you put, the heavier unsprung weight you get as well.

To answer OP's question:

on 18's: 265/40 or 275/35.

Last edited by 350Zdj; Feb 6, 2012 at 10:30 PM.
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Old Feb 6, 2012 | 11:00 PM
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Since you mention track tire, stay away from NT05's , they wear fast and really don't have the greatist grip. Look into the Hankook RS3 , it is so much better of a tire. I run a 275/35 up front (RS3) on a 9.5 and a 285 out back on a 10.5 inch wheel. You can also run 285/35 all around if you want.
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Old Feb 6, 2012 | 11:24 PM
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I guess the middle bracketed size is the ideal size for these then.



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Old Feb 7, 2012 | 11:11 AM
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i would run 265/35/18 on all four corners on a 9.5
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Old Feb 7, 2012 | 04:01 PM
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Originally Posted by terrasmak
Since you mention track tire, stay away from NT05's , they wear fast and really don't have the greatist grip. Look into the Hankook RS3 , it is so much better of a tire. I run a 275/35 up front (RS3) on a 9.5 and a 285 out back on a 10.5 inch wheel. You can also run 285/35 all around if you want.

I'll look into the hankook rs3, i just mentioned the nitto nt05s because a friend of mine mentioned he runs those on his M3 and likes them.
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Old Mar 24, 2012 | 04:37 AM
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Oh i am so confused.

We have one guy saying put smallest possible for 9.5 on front for better steering (245/40) and then bigger in the rear, 265/40-285/40 for the same 9.5"... (although RS-3 doesn't come in 285/40/18)..

Another guy saying (and from what i have read terrasmak knows his ****)
275/35 up front (RS3) on a 9.5 and a 285 out back on a 10.5 (these dont come in 10.5 )...but it would still fit fine

And another saying 265/40 and 265/40 all round

Prices for RS-3
265/35/18 $225
265/40/18 $284
245/40/18 $177
285/40/18 $252

Im thinking front 245/40/18 (perfect OD from stock) on 9.5 + 45? Would it be better for BBK clearance?
and rear 265/35 (265/40 is better for OD) but others say having 5 smaller sidewall on wider rear (vs front) is better ?? on 9.5 +25

Would the front look/perform better with deeper dish +25 offset ?

And last of all will these wheels in either offset fit AP Racing 3700 362mm 6 piston brakes? for them to fit there needs to be 25cm from the edge of the right side of wheel barrel to the left edge of wheel hub hole.. (can anyone measure ?) Spoke wise (if i need a spacer) depends on having 6cm from top of hub to closest spoke... Thanks for the help.

Last edited by R6n350GT; Mar 24, 2012 at 04:39 AM.
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Old Mar 24, 2012 | 05:34 AM
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This is a god tool to play with...

http://www.rimsntires.com/specs.jsp
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Old Feb 5, 2015 | 03:43 PM
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I have stock suspension and went with 265/40ZR18 up front and 275/40ZR18 rear. A larger mix of these cars are lowered so finding pictures of a setup with stock height wasnt easy. I used superstreet's write up to gauge what would work and ended up with no rub at full lock or compression. Figured I'd add some pics of stock height with these tire sizes for any who choose not to lower their Z.





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