Buying rims/tires on tirerack have question... need help

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Sep 3, 2006 | 03:45 PM

mndthegap1

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From: new york

Buying rims/tires on tirerack have question... need help

okay so im going to buy Motegi Track touge rims

18x9 in the front +25mm offset
18x10 in the rear +30mm offset

question is tirerack says to get 225/45-18 front and 245/45-18 rear for tires.
is this correct ? or should i do 245 in the front and 275 in the rear ?
also i want the rims to sit flush with the fenders i have eibach pro kit with 1.2 inch drop all around...

thanks in advance link isnt working but here is the actual info :

Finish Shown: Black w/Mach Lip

Other Available Finishes:
Anthracite w/Mach Lip
Chrome Plated

Size Selected: 18x9Front
Price: $234 (each)
Estimated Availability: In Stock
Recommended Tire Size: 225/45-18
Wheel Offset: +25mm
** Lightweight: 25.5 lbs. **

Size Selected: 18x10 Rear
Price: $243 (each)
Estimated Availability: In Stock
Recommended Tire Size: 245/45-18
Wheel Offset: +30mm
** Lightweight: 28.0 lbs. **

Additional Specs

Bolt Pattern: 5-114
Finish Warranty: 1 YEAR
Country of Origin: CHINA
Construction Type: 1 PC CAST

Sep 3, 2006 | 03:49 PM

masterj26

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most go with 245/40/18f 275/40/18r

Sep 3, 2006 | 04:39 PM

syk69

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those are the same rims im gettin for mine. though im going with 245/40/18 and 285/35/18 and tire rack isnt the cheapest place to get them. try going to http://www.wheelsfortuners.com

i think it would be like $797 shipped way cheaper than tirerack. im gonna get mine with the toyo proxes t1r's too. hopefully it will look nice.

Sep 3, 2006 | 04:45 PM

masterj26

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i went with 245/40/18 and 285/35/18 falken fk452. Check with Luke of discount tire for tire prices

Sep 3, 2006 | 04:47 PM

syk69

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From: florida

hey masterj, what do you think of your falken's? i noticed they are cheaper than the toyos. im not to familiar with that brand.

Sep 3, 2006 | 05:29 PM

masterj26

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honestly i am very happy with them. they have good wet and dry traction.

Sep 3, 2006 | 08:44 PM

InSaNeZ

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From: Chicago

I would actually go with a 255 in the front.

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Sep 3, 2006 | 10:46 PM

davidv

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From: Tucson, AZ

The TireRack does a good job with recommended offsets. But as far as tire sizes, I haven't the faintest idea how they arrive at such weird sizes.

Sep 4, 2006 | 10:13 AM

mndthegap1

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From: new york

thanks everyone for the responces.
well they are ordered 1554 for rims/tires mounted, balanced and shipped 2nd day.

went with 18x9 front with 245/40/18 front
and 18x10 with 275/40/18 rear
came with lugs and everything...
ill post pics once they are on.

Sep 4, 2006 | 10:28 AM

#10

Brick-Z

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225?????Are those motorcyle tires????

Go with the 245F-285R

Sep 4, 2006 | 10:44 AM

#11

RadioManJ350Z33

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If you get that narrow or a tire for a 9" and 10" wide wheel, the tire will not bead to the rim and it will pop off the first corner you take. Tire rack's database does not show the right size tire for that wheel.

245 up front and 275 in back will work, 40 series both ways

" wide wheel... 225 minimum - 245 maximum
8.5" wide wheel.... 235 minimum - 255 maximum
9" wide wheel... 245 minimum - 265 maximum
9.5" wide wheel... 255 mimimum - 275 maximum
10" wide wheel... 265 minimum - 285 maximum
10.5" wide wheel... 275 minimum - 295 maximum
11" wide wheel... 285 minimum - 305 maximum

As you can see, you have 30mm play on each with wheel keeping things safe, and allowing the tire to bead correctly.

The concept is not to narrow of a tire so that it rolls to far off the rim toward center, and not to wide that the side wall rolls of the lip spilling over.
Too much eitther way will cause the tire bead not to set properly on the rim causing blow out. You want the side wall nearest to a parallel line with the lip of the rim.

Quote:

Originally Posted by mndthegap1

Last edited by RadioManJ350Z33; Sep 4, 2006 at 10:51 AM.

Sep 10, 2006 | 06:31 AM

#12

Gerry

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From: Mahopac, NY

Seems like a lot of wheel and tire sites are conservative as far as tire to rim size. Ive seen some sites that reccomend a 225 tire on a 9.5". I went with Tire Racks reccomendation on tires. They did good on the rear I went with 18x10.5 with a 275/40 but the front I went with 18x9 and the 225/45 and it is stretched. Its not terrible but the rim protecter isnt doing much. Next time I get tires Ill go with 245 in front.

Sep 12, 2006 | 06:49 PM

#13

bonusfrag

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With a configuration of 245/40/18f and 275/40/18r, is that going to set the TCS off all the time, or is that OK? Sorry, I'm a noob.

Sep 12, 2006 | 06:56 PM

#14

Nexx

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From: DFW

Quote:

Originally Posted by bonusfrag

With a configuration of 245/40/18f and 275/40/18r, is that going to set the TCS off all the time, or is that OK? Sorry, I'm a noob.

nope, you're good.

Sep 12, 2006 | 06:58 PM

#15

XZLR8NZ

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From: San Jose,CA

how wide can i go with the stock 17's right now i have 235/40/17 in rears and 225/50/17 in the front?????

Sep 12, 2006 | 07:06 PM

#16

dubbzdiggler

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From: Indiana

The reason the tire rack knows the offsets and sizes is because they do the research...they actually have all of the most high tech equipment to measure out fitments and what not. The sizes are actually a pretty exact science...the Z is set up to have a rear tire that is about an inch or so give or take taller than the front tire. If you go with a 285/35R18 then it's not quite the right fitment, plus with a 245, the correct and most common stagger is 275 rear and with a 285 rear, you want 255's in the front. Listen to what the Tire Rack has to say, they know what they are talking about. Plus, if something is damaged, Tire Rack will take it right back unlike some of the horror stories I've read on here where companies ignored customer complaints and avoided problems...and why does everyone want cheap tires, you're car works better with good tires. You get what you pay for.