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Old 07-12-2009, 07:11 PM   #1
rs25SAM
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Question Going to 17" back to 16" as close to stock.

Hi guys,

Turns out that Chicago potholes and 17" wheels (Rota Tarmac II) didn't work out. I'm thinking about going back to 16" and getting as close as stock (not sure what the specs on those are) as possible without spending a fortune. I currently own a 2005 2.5RS Impreza.

I've read the sticky about offsets at:

http://forums.nasioc.com/forums/showthread.php?t=335263

A question that I have is that I am interested in using TireRack.com Sport Edition F7 16x7. The offset on the site is 50mm. Is that the same as +50mm? Or should i go with a safer option that matches specs of the sticky with the TireRack.com Sport Edition A7 16x7.5 with an offset of +50mm?

http://www.tirerack.com/wheels/Wheel...All&sort=Price


http://www.tirerack.com/wheels/Wheel...All&sort=Price

I going to fit them with 205/55R16 Juhmo Ecsta HP4 716 tires. I will have tirerack.com mount and balance them (for free). Does anyone have any experience with them in that once they arrive, I can just basically put them on and go?

Can I reuse the lugs that I'm currently using?


Apologies for a lot of noob questions. I did in fact search but was unable to come up with results.


Thanks in advance!
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Last edited by rs25SAM; 07-13-2009 at 02:28 PM.
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Old 07-12-2009, 08:44 PM   #2
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Quote:
Originally Posted by rs25SAM View Post
Hi guys,

Turns out that Chicago potholes and 17" wheels (Rota Tarmac II) didn't work out.
and id BET that you didnt run enough pressure in your tires
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Old 07-12-2009, 09:23 PM   #3
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or used a super low aspect ratio.
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Old 07-12-2009, 09:53 PM   #4
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a 16X7 wheel with a +50 offset and 205/55/16 tires will fit fine.
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Old 07-13-2009, 12:28 AM   #5
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Why not go 225/50/16?? Will work for either of those rims.
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Old 07-13-2009, 01:43 AM   #6
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Quote:
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Why not go 225/50/16?? Will work for either of those rims.


ever try it????
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Old 07-13-2009, 09:52 AM   #7
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Thanks for the replies guys. I tried to keep pressure at 32psi, but the pot holes near the o'hare expansion are huge. ground clearance and shocks are stock.

I guess I'll go with TireRack.com Sport Edition A7 16x7.5 with an offset of +50mm just to be safe (seems to fit the spec of the sticky on NASIOC). Since I'm not sure if +50mm is the same as 50mm (sorry typo in the OP). Do you think I can reuse the lug nuts I have?

Last edited by rs25SAM; 07-13-2009 at 10:04 AM.
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Old 07-13-2009, 12:54 PM   #8
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Quote:
Originally Posted by Uncle Scotty View Post


ever try it????
Yes. Put 225/50/16's on 04 WRX wheels which are only 6.5" wide. A 7" or 7.5" rim would be ideal for that size (bridgestone sizes the tire on an 7.0" rim, for example). It's also a very good height for the wrx slightly shorter than stock.
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Old 07-13-2009, 02:27 PM   #9
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Thanks for the input guys. Any ideas if I can reuse lugs? In addition, the reason why I am going with 205/55R16 is because its the closest to stock as possible.
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Old 07-13-2009, 03:10 PM   #10
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Quote:
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Yes......
and it was mushy as hell and sucked
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Old 07-13-2009, 09:26 PM   #11
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there was your problem, 32psi is much too low. start at 38, see how you like it. then move up from there. I like 42 front 40 rear.
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Old 07-13-2009, 10:19 PM   #12
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Quote:
Originally Posted by WeldingHank View Post
there was your problem, 32psi is much too low. start at 38, see how you like it. then move up from there. I like 42 front 40 rear.
ding-ding-****ing-ding
___________________________________________

and if you ****rd up 17's.....you will **** up 16's too
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Old 07-14-2009, 09:17 AM   #13
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Quote:
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and it was mushy as hell and sucked
Why do you say that? The damn tire is spec'd on a 16x7" rim!
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Old 07-14-2009, 06:14 PM   #14
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Well thanks for all the help guys, I guess I'll have to contact TireRack.com for the rest of my questions!
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Old 07-14-2009, 06:41 PM   #15
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Quote:
Originally Posted by WeldingHank View Post
there was your problem, 32psi is much too low. start at 38, see how you like it. then move up from there. I like 42 front 40 rear.

ahhhh, for the 16 in stock 04 wheel, the chart on the car says 32 not 42psi
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Old 07-14-2009, 07:17 PM   #16
rs25SAM
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I had 32psi on my 17" which I believe he was correcting me that it should be higher. Now that I'm downgrading to 16" I'll probably stick to 32psi per stock spec.
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Old 07-14-2009, 07:29 PM   #17
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tire pressure is more dependant on the tire then the chart, that chart is for a stock RE92 tire, if you change to a different tire even in the same size it can have different MAX PSI ratings.

You have to run the right amount for the tire not the little label on the door, UNLESS you have the stock tires on the car.
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Old 07-16-2009, 02:49 PM   #18
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jesus christ

this ****ing thread is so ****ing full of fail that it makes me want to ****ing puke
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Old 07-16-2009, 03:56 PM   #19
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OP, either of those wheels will work just fine on your car.

Tirerack ships new lugs, use those. The wheels will arrive ready to bolt on, nothing special needed.

The tire you want doesn't list a rim size in its specs, but other kumho 205/55-16's spec a 6" rim for that size. That leads me to believe that the tire on a 7.5" rim is a stretch, and that 7" is still a bit off. None of the other sizes of that tire are remotely applicable to your car. I concur with the poster above, a 225/50-16 on a 7" rim would be great. You would just have to find some other tire which actually comes in that size.

Any reason why you want the tire you chose? There are probably better options.
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Old 07-16-2009, 05:46 PM   #20
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Uncle Scotty, you seem to completely ignore sidewall in determining what tire width will work with what rims. 40, 45, and 50 sidewall are all TOTALLY different when it comes to tires. As you move from a traditional sidewall to something more low profile, your tire has to be closer to the size of the rim. Simply, 50 sidewall vs 40 sidewall on the same width rim should be two different tire widths! You seem to assume that regardless of the sidewall, a tire width should be very close to the rim width.

50 sidewall is generally 5-50% wider tire than rim
45 sidewall is generally 2.5-30% wider tire than rim
40 sidewall is generally 0-20% wider tire than rim
Generally "optimum" is about in the middle and note that middle is very different for 40 (10%), 45 (16%) or 50 (28%)

Optimum tire for a specific situation (X type, Y brand, Z race, etc) might be a little different but not drastically. Telling somebody that the manufacturer recommended tire size for their rim would be **** is moronic.

Also, more tire width is generally a help to performance. The fenders of the car can more than handle 225 width at a high offset (like he's choosing). Granted too wide for your rim is a problem but a 225/50/16 tire is not spec'd for a very wide rim!

Look at bridgestone's specs for example. 225/50/16 is 6.0-8.0" where a 225/40/18 tire is 7.5" to 9.0" of rim width. One is spec'd for a 7.0" width, the other for a 8.0" width. Sidewall changes everything!

Last edited by mosc; 07-16-2009 at 05:54 PM.
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Old 07-16-2009, 10:41 PM   #21
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Quote:
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Uncle Scotty, you seem to completely ignore
no----no---i dont

what I DO know is what works and what does not

MANY here dont know **** without their ****ing sliderule and pda and book of tables...and most of THAT is wrong, anyway


Why dont you just stick to your bean counting and let us get along with the car stuff
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Old 07-17-2009, 01:07 AM   #22
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First, this little guy is helpful: http://www.miata.net/garage/tirecalc.html

I downsized from stock 17x7 to 16x8 slipstreams (48offset) with 225 50 16's for extra sidewall. I got the clearance RE01R's. I did this due to harsh sierra roads, highway and dirt both and I'm glad I did. Its been awesome and the characteristics of the tire gave me exactly what I wanted. Better resistance to ownage by roads that get jacked in winter from chains and constant plowing (We get plundered by snow here) and dont get repaired until mid-late summer, as well as less worry about dirt roads with a wagon full of climbing gear. I had to roll the rear fenders slightly. There were too many times rolling out a dirt road into the sun, washboards and potholes and then me out checking for sidewall bubbles. This worked well for me and my car is fun and usable on good roads, my commute 30 mi to work on the fwy, bad bombed-out roads that get fixed just in time for more plowing, and backwoods dirt roads with a car full of gear, beer, and friends.

If I were you, I would do the 225 50 16 thing, you could easily find some RS 16x7's with 225's mounted here in the classifieds, or boosts and slipstreams are readily available in 16x7 and 8
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Old 07-17-2009, 07:01 AM   #23
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Quote:
Originally Posted by Uncle Scotty View Post
no----no---i dont

what I DO know is what works and what does not


Seriously?
You, who is so vehemently against stretched tires, and who uses the specs given by the manufacturer in 17" to determine whether or not it's a stretch, is saying you want to stretch a 16" tire over a wider wheel than the manufacturer specifies?


I mean, hell, the new re-11, undoubtedly a performance tire, is measured by bridgestone on a 7" wheel in that size. Do you know something bridgestone doesn't????
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Old 07-17-2009, 09:28 AM   #24
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first of all, you all need to remember that while uncle snotty isn't god, he likes to play it. Like he's run every possible tire/wheel combination on a subaru . I'm sure i own more tires and wheels currently than 90% of this board. Doesn't make my advice any more special or absolute.

However, i do see the op's very valid point about wanting a softer ride for his local roads. Which a smaller diameter wheel and taller tire will provide. It also provides more protection for your wheels from damage. I also agree with the suggestion of going to a 225/50 rather than a 205/55, but thats just to get more rubber in contact with the road. Also, theoretically, a 205/55 and 225/50 have almost identical sidewall heights. (2.22" vs. 2.21").

On the pressure note, running more tire presure will not make you ride smoother. It will make it rougher. And spec'd 32psi is fine. (I think i run about 33F/30R in my STi.) It should give you even tire wear. Most cars these days, and tires, spec in the low 30's. Running 42 psi on the street will mostly just wear out the center of your tires. Hell, i don't even end up with 42 psi in a lot of my race tires once i've got them set for conditions.

And if you'd really like a professional opinion, ask Luke on here who works for tirerack.com. I'm sure he's got some valid advice.

Oh, and just an opinion here, but that F7 model looks waayy better than that A7 model. But, hey, thats just my opinion..

Last edited by neko; 07-17-2009 at 09:41 AM.
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Old 07-17-2009, 10:34 AM   #25
Uncle Scotty
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Quote:
Originally Posted by sniper1rfa View Post
Seriously?
You, who is so vehemently against stretched tires, and who uses the specs given by the manufacturer in 17" to determine whether or not it's a stretch, is saying you want to stretch a 16" tire over a wider wheel than the manufacturer specifies?


I mean, hell, the new re-11, undoubtedly a performance tire, is measured by bridgestone on a 7" wheel in that size. Do you know something bridgestone doesn't????


just because you can MAKE something fit does NOT make it a good idea

and THAT happy horse**** fact eludes too many here

the wrong 225/50-16 on a too narrow wheel will be floppy as hell

YOU CAN NOT COMPARE DIFFERENT TIRES TO DIFFERENT TIRES BECAUSE THEY ARE ALL DIFFERENT FOR DIFFERENT REASONS AND ONE TIRE MAY BE FINE WHILE ANOTHER OF THE SAME ****ING SIZE MAY SUCK BALLS

AND IF THAT SAD FACT IS LOST ON YOU OR ANYONE ELSE----JUST SHUT IT AND READ

BLOODY CHILDREN HERE POSTING OUT THEIR ASSES WITHOUT LOOKING AT ALL THE FACTS OF THE MATTER AND NOT JUST THE ****ING 'NUMBERS'
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