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Old 06-27-2005, 01:38 PM   #1
Optimus Prime
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Default Help choosing tires for an 05 STi

I need new tires and I would like some opinions. While the stock ones have been great, I was wondering if it was worth jumping to 235/40 17's.

The tires I have been considering are:
Bridgestone Potenza S-03
Yokohama Advan Neova AD07
BF GoodRich fForce T/A KDW 2

Any opions or any other tire or sizes I should be looking at?
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Old 06-27-2005, 02:03 PM   #2
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Avon M500


or get the Dunlop Direzza in 255. =)
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Old 06-27-2005, 02:09 PM   #3
Scott Farmer
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More rubber is always good, except when it comes to cost. Those are all great tires, but pricey. Check out Hankook Ventus R-S2 Z212 for most of the same performance (or more depending on who you ask) for half the price.
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Old 06-27-2005, 03:11 PM   #4
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Quote:
Originally Posted by Optimus Prime
I need new tires and I would like some opinions. While the stock ones have been great, I was wondering if it was worth jumping to 235/40 17's.

The tires I have been considering are:
Bridgestone Potenza S-03
Yokohama Advan Neova AD07
BF GoodRich fForce T/A KDW 2

Any opions or any other tire or sizes I should be looking at?
Why would you go with 235/40? The size is considerably shorter than the stock diameter. The best substitute would be 255/40/17, but 245/40/17 (a bit shorter) and 235/45 (a bit longer) are both fine. 255/40 is a bit too wide for a stock 8 inch wheels (at least 8.5 recommended), but after installing 245/40 PS2 I feel that 255/40 would fit pretty well. Extra-width will not be apparent in everyday driving, but at the races (especially at auto-x) you will appreciate that extra patch.
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Old 06-27-2005, 03:51 PM   #5
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(never mind)

yeah, don't go with a shorter tire than stock, you'd be bummed.

http://www.miata.net/garage/tirecalc.html
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Old 06-27-2005, 05:03 PM   #6
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I've had great luck with my Eagle F1 GS-D3's.....
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Old 06-27-2005, 05:38 PM   #7
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When I get new tires, I will be getting the BFG KDW2. According to the ratings on tirerack.com, they are a great tire...especially for the money. My car is lowered one inch, so I am a little worried about rubbing on the inside of the spring seat, but I would love to go 245/40/17 (stock rims).
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Old 06-27-2005, 05:46 PM   #8
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i have the 235/40/17 hankook rs2 z212 and the shorter sidewall has no apparent drawbacks.. at least not to me..
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Old 06-27-2005, 05:54 PM   #9
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S-03's no question
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Old 06-27-2005, 05:57 PM   #10
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Quote:
Originally Posted by Scott Farmer
More rubber is always good, except when it comes to cost. Those are all great tires, but pricey. Check out Hankook Ventus R-S2 Z212 for most of the same performance (or more depending on who you ask) for half the price.
I heard this one as well.

Get the 245's for about $110
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Old 06-27-2005, 06:17 PM   #11
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255 direzza's are cheap too... Dunlop's JGTC "brand" hehe. heard good reviews on them so far.

It all depends on how much you really want to spend. I mean, I can get a set of Capital Negotiator z-rated tires in that size for aroun 90/tire I think... they're made by falken in Japan... or you can look ito the fuzions which are made by bridgestone... or get the michelin PS2's if cost don't matter. =)
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Old 06-27-2005, 06:27 PM   #12
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Ok, so I miscalculated! 245/40 17s sound nice...but now it's 3 pages of choices instead of 3 (on tirerack.com)!

I'm looking for something that is as sticky as stock, but is a little better in the rain.

Last edited by Optimus Prime; 06-27-2005 at 06:33 PM.
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Old 06-27-2005, 07:38 PM   #13
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Quote:
Originally Posted by sil0nt
i have the 235/40/17 hankook rs2 z212 and the shorter sidewall has no apparent drawbacks.. at least not to me..
Speedo is now incorrect. May be a significant drawback to some...
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Old 06-27-2005, 07:43 PM   #14
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Quote:
Originally Posted by 04STiguy
Speedo is now incorrect. May be a significant drawback to some...
i guess that degree in math DOES come in handy.......

really.. its not that hard to figure out the difference just once and remember it from there on out..
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Old 06-27-2005, 08:29 PM   #15
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Your odo also reflects more miles than your vehicle actually has on it.
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Old 06-27-2005, 09:45 PM   #16
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Ok! I'm getting the BF Goodrich g-Force KDW in 245/40 17. Will I rub with that or no?

Thanks for all the help!
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Old 06-27-2005, 09:47 PM   #17
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Quote:
Originally Posted by 04STiguy
Your odo also reflects more miles than your vehicle actually has on it.
ya, that one can definitely be a substantial factor, but not really for me. i drive my car about 4000-5000 miles on these tires per year (winters are stock size).. which equals about 100 miles extra per year....
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Old 06-28-2005, 07:08 PM   #18
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If you got the cash, go with the new Yokohama Advan A048 or Neova tires. They are a little on the expensive side, but worth it.
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Old 06-28-2005, 07:11 PM   #19
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Quote:
Originally Posted by PGH'02RS
I've had great luck with my Eagle F1 GS-D3's.....
Just put those on today.
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Old 06-28-2005, 09:31 PM   #20
root
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Quote:
Originally Posted by 04STiguy
Speedo is now incorrect. May be a significant drawback to some...
FWIW, the speedometer was incorrect as-is from the factory, at least on the 2004s. I assume that was also true of the 2005s.
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Old 06-29-2005, 10:03 AM   #21
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Quote:
Originally Posted by root
FWIW, the speedometer was incorrect as-is from the factory, at least on the 2004s. I assume that was also true of the 2005s.
Is this due to the tire-size difference on the JDM STi's (235-45-17) versus the USDM STi's (225-45-17)?
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Old 06-29-2005, 10:22 AM   #22
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I've never heard an official explanation as to why it is wrong, but your guess is a reasonable one I'd say since it would take a slightly larger diameter tire to make it accurate.
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Old 06-29-2005, 03:00 PM   #23
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I would go with a 245 45 17. It's taller than stock, but would make the gears inthe STI longer as I feel they are too short. Plus the STI has enough torque to drive the slightly larger diameter heavier tires.
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Old 06-29-2005, 10:25 PM   #24
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people blow the speedometer thing and odometer thing way out of propotion. Lets say stock size (sti) is 225/45/17, and you go with a 235/40/18 when you upgrade ur tires. It will be 1.7% off. So when you are going 60mph you are actually going 61 mph. When you are cruizing the interstate at 85 - you are actually going 86.4mph. If you are really speeding and doing 100 it will read 101.7. Thats a very small difference if you ask me. Most car manufactures have the speedo real a little high anyway... As for the odometer, every 100,000 miles you travel, the odometer will record 101,700, so 1700 miles too high, again, not very high. At an average of 12,000 miles per year the average person does, thats only 204 miles read high, so 12,204. So go with the fatter wider looking tire
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