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Old 01-25-2007, 12:52 PM   #1
millerni
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Default 245/40 or 245/45 on stock 05 STi wheels

Trying to get some opinions on what suits the STi best between these two. It seems that the diameter of the 245/40 is .3" shorter than stock while the 245/45 is .7" taller and I'm not willing to step up to the 255/40 to get the exact rolling diameter of stock...soooo any real advantages/disadvantages between the two? Thanks in advance nasioc.
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Old 01-25-2007, 12:59 PM   #2
nate.the.great
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245/40

pros
better gearing/acceleration. lighter tire.

cons
speedo will read faster than you're actually going so you'll add miles on your car faster.
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Old 01-25-2007, 01:18 PM   #3
millerni
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Thanks nate..and as for the speedo being off, it comes from the factory being 4 too fast anyway..which has probably saved me from a ticket or two, so it's not too bad
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Old 01-25-2007, 02:01 PM   #4
Yoo Shin
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If you autox, gearing is something to think about. Alot of folks like the 245/45 size to keep from having to go to 3rd gear.
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Old 01-25-2007, 02:13 PM   #5
millerni
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As much as I'd love for autox to be a factor, it's just completely nonexistent in louisiana. The tires i'm ordering are falken fk452's anyway...not the best autox tire. Thanks for the advice so far..keep it coming.
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Old 01-25-2007, 06:47 PM   #6
_sti_05
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do u need to roll the fender with 245?
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Old 01-25-2007, 06:50 PM   #7
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245/40 ditto. .7 taller is more than .3 so go the the one that is closest. If I were you I'd say to myself "don't be a pu$$y and just get the 255;s". I have them and love them....perfect size imo.
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Old 01-25-2007, 06:59 PM   #8
millerni
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haha...true and I'd love to, but there's really no point in sacrificing the comfort when I have no use for that much width in autox and such..plus I'm on the stock 8" wides which really aren't all that well suited with that much rubber..one day though, one day

Last edited by millerni; 01-25-2007 at 07:14 PM.
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Old 01-25-2007, 07:04 PM   #9
_sti_05
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does going with a wider tire effect how much gas you use?
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Old 01-25-2007, 07:13 PM   #10
millerni
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the heavier the tire, the more your gas mileage goes down..so since wider equals heavier, it does effect gas mileage
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Old 01-25-2007, 09:28 PM   #11
tora
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millerni, not trying to convince you on the 255's (actually I am), but I run them on an 8" wheel with no issues, looks fat, I've had them at the track with no problems...I would strongly recommend it. 245 will be cool but I bet you money you will regret not having gone with the 255's!!

Anyways, whatever you get enjoy.
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Old 01-25-2007, 09:37 PM   #12
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I've actually been convinced on the 255...one huge problem though. I ordered the 245/40's this afternoon from edgeracing.com . I'm assuming it's too late now. Although I haven't received a tracking number yet. Think it's too late?
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Old 01-25-2007, 11:38 PM   #13
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call them first thing tomorrow morning, shouldnt be to late, i doubt they shipped them that fast.
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Old 01-25-2007, 11:50 PM   #14
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I'm going to give it a shot. The order confirmation has gone through already, but that shouldn't be a reason for not being able to change it. Thanks folks.
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Old 01-25-2007, 11:56 PM   #15
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hey why did u go with the falkens over the kumho's
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Old 01-26-2007, 12:15 AM   #16
millerni
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the fk452 is far better suited to my driving style and conditions and was $20 less per tire..the 452 ,from everything I've read, is great in the dry and wet, which is pretty important when living in louisiana..they should also last me quite some time
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Old 01-26-2007, 04:13 PM   #17
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the FK452 is a very nice tire and the 245/40 will give you a nice sidewall and wont be a sloppy as the larger 45 series.
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Old 01-29-2007, 12:42 PM   #18
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Default Clearance issue with 245/40/18 for 05' STi??

Sorry wrong thread.
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Old 01-29-2007, 06:59 PM   #19
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Sorry to hijack...why are people recommending wider tires? I am no where nere breaking traction with stock tires. I am looking to get tires for the '05 STi too. I daily drive my car and was thinking of getting the 235/45/17's. What do you guys think.

I do have BFgoodrich DR for my weekend SUPRA though
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Old 01-30-2007, 11:30 AM   #20
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If the speedo is already off with stock tires, its going to be even MORE off with 245/40's. Aren't we talking about 5-7 mph difference here? That's pretty significant in my book.

245/45 can't weight THAT much more, and would put your SPEEDO back towards acceptable levels of accuracy.
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Old 01-30-2007, 12:19 PM   #21
millerni
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thanks for the advice, but the 245/40's will arrive on a brown truck today...and the 245/40's are .06mph faster than stock...not too terrible, but yes it'll be off by nearly 5mph now
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Old 01-30-2007, 06:27 PM   #22
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Quote:
Originally Posted by millerni View Post
thanks for the advice, but the 245/40's will arrive on a brown truck today...and the 245/40's are .06mph faster than stock...not too terrible, but yes it'll be off by nearly 5mph now
Do let us know how it fits. As you may or may not seen my thread. Mine's are coming next week 245/40/18 on Eibach. I was told from someone here on the forum that it should fits but we'll see. Keeping my fingers crossed.
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Old 01-30-2007, 06:44 PM   #23
millerni
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Quote:
Originally Posted by bluert View Post
Do let us know how it fits. As you may or may not seen my thread. Mine's are coming next week 245/40/18 on Eibach. I was told from someone here on the forum that it should fits but we'll see. Keeping my fingers crossed.
I definitely will. They won't be mounted until tomorrow, but I'll let you know.
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Old 01-31-2007, 05:08 PM   #24
millerni
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They mounted up no problem...they are quite a bit closer to the rear strut than I expected however. Now for a new off topic question. Can I still manage with no rubbing if I put a set of cobb springs on? I'll probably start a new thread, but hopefully someone will chime in here.
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Old 02-03-2007, 04:59 PM   #25
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so did the wider tires fit good? no problems, still kinda of wondering if i should go 245 or stay at 225. dont want any problems and then they wont return them if their too big.
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