245/40 or 245/45 on stock 05 STi wheels

millerni · 01-25-2007, 11:52 AM

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.

* Registered users of the site do not see these ads.

nate.the.great · 01-25-2007, 11:59 AM

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.

millerni · 01-25-2007, 12:18 PM

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

Yoo Shin · 01-25-2007, 01:01 PM

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.

millerni · 01-25-2007, 01:13 PM

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.

_sti_05 · 01-25-2007, 05:47 PM

do u need to roll the fender with 245?

tora · 01-25-2007, 05:50 PM

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.

millerni · 01-25-2007, 05:59 PM

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

_sti_05 · 01-25-2007, 06:04 PM

does going with a wider tire effect how much gas you use?

millerni · 01-25-2007, 06:13 PM

the heavier the tire, the more your gas mileage goes down..so since wider equals heavier, it does effect gas mileage

tora · 01-25-2007, 08:28 PM

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.

millerni · 01-25-2007, 08:37 PM

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?

_sti_05 · 01-25-2007, 10:38 PM

call them first thing tomorrow morning, shouldnt be to late, i doubt they shipped them that fast.

millerni · 01-25-2007, 10:50 PM

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.

_sti_05 · 01-25-2007, 10:56 PM

hey why did u go with the falkens over the kumho's

millerni · 01-25-2007, 11:15 PM

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

Td5turbo · 01-26-2007, 03:13 PM

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.

bluert · 01-29-2007, 11:42 AM

Sorry wrong thread.

turbohardtop · 01-29-2007, 05:59 PM

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

future_GDB · 01-30-2007, 10:30 AM

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.

millerni · 01-30-2007, 11:19 AM

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

bluert · 01-30-2007, 05:27 PM

Quote:

Originally Posted by millerni

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.

millerni · 01-30-2007, 05:44 PM

Quote:

Originally Posted by bluert

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.

millerni · 01-31-2007, 04:08 PM

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.

_sti_05 · 02-03-2007, 03:59 PM

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.

01-25-2007, 11:52 AM	#1
millerni Scooby Newbie Member#: 80756 Join Date: Feb 2005 Chapter/Region: RMIC Location: Fort Collins, Co Vehicle: 2005 STi WRB	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. * Registered users of the site do not see these ads.

01-25-2007, 05:59 PM	#8
millerni Scooby Newbie Member#: 80756 Join Date: Feb 2005 Chapter/Region: RMIC Location: Fort Collins, Co Vehicle: 2005 STi WRB	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 06:14 PM.

01-29-2007, 11:42 AM	#18
bluert Scooby Newbie Member#: 126959 Join Date: Sep 2006 Location: ontario	Clearance issue with 245/40/18 for 05' STi?? Sorry wrong thread.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
245/40 or 245/45 tires for STU?	bdi	Motorsports	26	03-24-2011 10:02 AM
245/40 or 245/35 ?	lowrider89	Newbies & FAQs	10	01-11-2008 09:46 PM
Zenki lugs on stock 05 STI wheels??	Davenow	Tire & Wheel	0	03-24-2006 02:56 AM
245/45/17 Kumho ECSTA V710 on stock '04 STi wheel...	gills	Tire & Wheel	3	10-20-2005 12:44 AM
255/40 on stock 05 STI wheels/pink springs?	paulw	Tire & Wheel	6	02-07-2005 09:22 PM

01-25-2007, 11:59 AM	#2
nate.the.great Scooby Specialist Member#: 72031 Join Date: Oct 2004 Chapter/Region: Tri-State Location: poor grammar fuels my anger	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.

01-25-2007, 12:18 PM	#3
millerni Scooby Newbie Member#: 80756 Join Date: Feb 2005 Chapter/Region: RMIC Location: Fort Collins, Co Vehicle: 2005 STi WRB	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

01-25-2007, 01:01 PM	#4
Yoo Shin Scooby Specialist Member#: 87327 Join Date: May 2005 Chapter/Region: South East Location: Texas but TDY in North Alabama Vehicle: 2010 12 parsec Evo X I still kill threads	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.

01-25-2007, 01:13 PM	#5
millerni Scooby Newbie Member#: 80756 Join Date: Feb 2005 Chapter/Region: RMIC Location: Fort Collins, Co Vehicle: 2005 STi WRB	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.

01-25-2007, 05:47 PM	#6
_sti_05 Scooby Specialist Member#: 72313 Join Date: Oct 2004 Chapter/Region: TXIC Location: Brownsville, Tx Vehicle: 2005 STi Black	do u need to roll the fender with 245?

01-25-2007, 05:50 PM	#7
tora Scooby Guru Member#: 5851 Join Date: Apr 2001 Chapter/Region: VIC Location: Vancouver Vehicle: 09 Forester XT + NA Miata	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.

01-25-2007, 06:04 PM	#9
_sti_05 Scooby Specialist Member#: 72313 Join Date: Oct 2004 Chapter/Region: TXIC Location: Brownsville, Tx Vehicle: 2005 STi Black	does going with a wider tire effect how much gas you use?

01-25-2007, 06:13 PM	#10
millerni Scooby Newbie Member#: 80756 Join Date: Feb 2005 Chapter/Region: RMIC Location: Fort Collins, Co Vehicle: 2005 STi WRB	the heavier the tire, the more your gas mileage goes down..so since wider equals heavier, it does effect gas mileage

01-25-2007, 08:28 PM	#11
tora Scooby Guru Member#: 5851 Join Date: Apr 2001 Chapter/Region: VIC Location: Vancouver Vehicle: 09 Forester XT + NA Miata	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.

01-25-2007, 08:37 PM	#12
millerni Scooby Newbie Member#: 80756 Join Date: Feb 2005 Chapter/Region: RMIC Location: Fort Collins, Co Vehicle: 2005 STi WRB	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?

01-25-2007, 10:38 PM	#13
_sti_05 Scooby Specialist Member#: 72313 Join Date: Oct 2004 Chapter/Region: TXIC Location: Brownsville, Tx Vehicle: 2005 STi Black	call them first thing tomorrow morning, shouldnt be to late, i doubt they shipped them that fast.

01-25-2007, 10:50 PM	#14
millerni Scooby Newbie Member#: 80756 Join Date: Feb 2005 Chapter/Region: RMIC Location: Fort Collins, Co Vehicle: 2005 STi WRB	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.

01-25-2007, 10:56 PM	#15
_sti_05 Scooby Specialist Member#: 72313 Join Date: Oct 2004 Chapter/Region: TXIC Location: Brownsville, Tx Vehicle: 2005 STi Black	hey why did u go with the falkens over the kumho's

01-25-2007, 11:15 PM	#16
millerni Scooby Newbie Member#: 80756 Join Date: Feb 2005 Chapter/Region: RMIC Location: Fort Collins, Co Vehicle: 2005 STi WRB	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

01-26-2007, 03:13 PM	#17
Td5turbo Scooby Newbie Member#: 126410 Join Date: Sep 2006 Chapter/Region: MAIC Location: Chs. SC/Virginia Tech Vehicle: 02 WRX Wagon Aspen White	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.

01-29-2007, 05:59 PM	#19
turbohardtop Scooby Newbie Member#: 51077 Join Date: Dec 2003	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

01-30-2007, 10:30 AM	#20
future_GDB Scooby Newbie Member#: 110135 Join Date: Mar 2006 Location: Ontario, Canada Vehicle: 2005 STi Black	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.

01-30-2007, 11:19 AM	#21
millerni Scooby Newbie Member#: 80756 Join Date: Feb 2005 Chapter/Region: RMIC Location: Fort Collins, Co Vehicle: 2005 STi WRB	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

01-31-2007, 04:08 PM	#24
millerni Scooby Newbie Member#: 80756 Join Date: Feb 2005 Chapter/Region: RMIC Location: Fort Collins, Co Vehicle: 2005 STi WRB	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.

02-03-2007, 03:59 PM	#25
_sti_05 Scooby Specialist Member#: 72313 Join Date: Oct 2004 Chapter/Region: TXIC Location: Brownsville, Tx Vehicle: 2005 STi Black	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.