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Old 12-09-2006, 09:00 PM   #1
kwan_1104
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Default What is the optimum wheel size for an impreza?

as the title says, what is the optimum wheel size for an impreza, 16"?17"? What is the optimum width of a rim or tire? r is there even no optimum size....just the weigh matters... (06 impreza 2.5i if there is a difference) The reason I asked is because I bought an 18" wheel that weighs 50 lb with tires, n I learned that its not good for my car, and now, I am considering to buy another set of wheel, n dun want to make another wrong decision. thank you
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Old 12-09-2006, 09:12 PM   #2
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maybe
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Old 12-09-2006, 09:48 PM   #3
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Most people run 17's and id have to saaay like 7 or 7.5 inch.
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Old 12-09-2006, 10:05 PM   #4
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Originally Posted by 007WRX View Post
Most people run 17's and id have to saaay like 7 or 7.5 inch.
Thats pretty narrow, but it really depends on what you are doing.

In terms of efficiency, you generally want to run as small a wheel as your brake requirements will allow. Obviously, tire construction/availability has to be taken into account.

If you can fit a 16" over your brakes, no real reason to run a 17" wheel. For the street however, the added turn-in might cause you to want to run a 17. (But you could have just changed to a stiffer 16" tire)

Bottom line: A bigger wheel will almost always be costing you at least a marginal amount in fuel economy and acceleration (normally not enough to even notice, although 18" wheels on a 2.5i will definately be felt). On the other hand, a shorter sidewall can achieve better responsiveness (very tire dependent though).

But when it comes down to 99% of people, they aren't buying wheels for performance. If that were the case, 16 x 8" wheels with a stiff-sidewall tire would be the ticket on a non-STi. People buy them for looks.
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Old 12-09-2006, 10:11 PM   #5
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A lot depends on your cars weight, as it will effect how any given tire will perform. On a GC8, it would be hard to argue that a 16" wheel with the appropriate tire isn't the way to go.

As you get into the 3000+ lb category, its harder to get a 16" tire to match the response of a 17" equiv. So for a WRX, it would be between a 16 and a 17" wheel.
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Old 12-09-2006, 10:14 PM   #6
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Oh and i forgot..18s own...and 19s also own...

19s


(not mine)
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Old 12-09-2006, 11:15 PM   #7
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also....there is one thing that i dun understand....many ppl say... with a 16" wheel, my car will be higher off the ground than the 18s...how would that be??
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Old 12-09-2006, 11:28 PM   #8
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[yoda]Optimum for what? Question that is the real . There are many answers to what you asked, but for what you are looking there is only one answer.
[/yoda]
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Old 12-09-2006, 11:51 PM   #9
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im going 17x8 on my 2.5i, anything from 7 to 8.5 is good in my opinion
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Old 12-10-2006, 11:46 AM   #10
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Quote:
Originally Posted by kwan_1104 View Post
also....there is one thing that i dun understand....many ppl say... with a 16" wheel, my car will be higher off the ground than the 18s...how would that be??
They are incorrect.
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Old 12-10-2006, 11:56 AM   #11
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Wheel size isnt a huge concern. To really depends on what you are doing. A large wheel will work good on our cars because we have AWD and dont need to air down until we are running outragous HP numbers....

Having a large wheel with a low profile tire also means the side wall will flex less making it handle better.

The major concern is weight. The stock 17's on the 06+ WRX's weigh around 43 lbs with tires. I dunno how much the stock 16's weigh with tires but I'm sure its still gonna be around there probably 38-42 lbs w/ tire.

In reality I cant really tell a difference between my stock 17's, my 18" Rotas, or my 18" Volks in acceleration. So unless you are going for an all out race car and everything has to be absolutely perfect I would just get something that looks nice....Trying to stay as light as possible...
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Old 12-10-2006, 12:15 PM   #12
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The major concern is weight. The stock 17's on the 06+ WRX's weigh around 43 lbs with tires. I dunno how much the stock 16's weigh with tires but I'm sure its still gonna be around there probably 38-42 lbs w/ tire.

Weight and the location of that weight. Again, like you said, most daily drivers usually won't be able to tell, so it may only be relavent for competition purposes, but:

If you have a 16" wheel/tire combo that weighs the EXACT same as a 17" wheel/tire combo, the 17" wheel still takes more power to accelerate/stop than the 16" wheel.
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Old 12-10-2006, 12:27 PM   #13
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Originally Posted by REX8 View Post
Weight and the location of that weight. Again, like you said, most daily drivers usually won't be able to tell, so it may only be relavent for competition purposes, but:

If you have a 16" wheel/tire combo that weighs the EXACT same as a 17" wheel/tire combo, the 17" wheel still takes more power to accelerate/stop than the 16" wheel.
Ahhh true...(never really thought about it until you mentioned something)

But how much more power will it actually take vs the gains in performance from lower profile tires?

I KNOW you can feel the difference between a 16 with 50 series vs an 18 with 40 series. I dont know if you can feel the extra power it takes to rotate them though...

Buy wheels for looks and if you want performance and looks buy race wheels but sometimes that extra 2000-2500 dollars is going to be hard to justify for a daily driver....
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Old 12-10-2006, 12:37 PM   #14
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Ahhh true...(never really thought about it until you mentioned something)

But how much more power will it actually take vs the gains in performance from lower profile tires?

I KNOW you can feel the difference between a 16 with 50 series vs an 18 with 40 series. I dont know if you can feel the extra power it takes to rotate them though...

Buy wheels for looks and if you want performance and looks buy race wheels but sometimes that extra 2000-2500 dollars is going to be hard to justify for a daily driver....
Well, you can't really compare the which one is better in terms of "performance". Obviously one is in a straight line, and the lother has to do with turn-in feel.

Again, like I said, for the street, you'd give up a hair of accel and braking for better initial crispness during turn in.

But on the track (road courses), turn-in feel isn't the concern, its all about maximum grip/HP/and braking.
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Old 12-24-2006, 12:51 AM   #15
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Quote:
Originally Posted by CynicX View Post
The major concern is weight. The stock 17's on the 06+ WRX's weigh around 43 lbs with tires. I dunno how much the stock 16's weigh with tires but I'm sure its still gonna be around there probably 38-42 lbs w/ tire.
what kinda device is accurate for weighting tire + rim?

i use an ikea weight scale and the stock 16 with RE92 weight like 40lbs on the scale...

and my forged aluminum 17x8 with tires weight around 34.5lbs on that scale

Last edited by StE823; 12-24-2006 at 02:04 AM.
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Old 12-24-2006, 02:21 AM   #16
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Quote:
Originally Posted by StE823 View Post
what kinda device is accurate for weighting tire + rim?

i use an ikea weight scale and the stock 16 with RE92 weight like 40lbs on the scale...

and my forged aluminum 17x8 with tires weight around 34.5lbs on that scale
ikea weight scale? For measuring the weight of people, I assume?

Human bath scales are notoriously bad at weighing things outside anticipated normal weight ranges (under 75 pounds, over 300 pounds). A lot of people will add a known weight to the scale to get a hopefully more accurate reading. That is, weigh yourself (A), pick up your wheel and weigh yourself holding the wheel(B), then subtract A from B (C). Does this with all four wheels, then put all four wheels on the scale and see if the numbers match up.

Your numbers for the stockers seems about right. 17lbs for the rims, 21-25 for the rubber. Without knowing what kind of 17s you have, there's no way to say whether that's right. Pretty light though.
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Old 12-24-2006, 02:27 AM   #17
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Quote:
Originally Posted by makanai View Post
Human bath scales are notoriously bad at weighing things outside anticipated normal weight ranges (under 75 pounds, over 300 pounds). A lot of people will add a known weight to the scale to get a hopefully more accurate reading. That is, weigh yourself (A), pick up your wheel and weigh yourself holding the wheel(B), then subtract A from B (C). Does this with all four wheels, then put all four wheels on the scale and see if the numbers match up.
thanks.. i'll try that method again tomorrow...
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Old 12-24-2006, 02:38 AM   #18
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What does the S204 run?
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Old 12-24-2006, 10:57 AM   #19
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Originally Posted by REX8 View Post
Thats pretty narrow, but it really depends on what you are doing.

In terms of efficiency, you generally want to run as small a wheel as your brake requirements will allow. Obviously, tire construction/availability has to be taken into account.

If you can fit a 16" over your brakes, no real reason to run a 17" wheel. For the street however, the added turn-in might cause you to want to run a 17. (But you could have just changed to a stiffer 16" tire)

Bottom line: A bigger wheel will almost always be costing you at least a marginal amount in fuel economy and acceleration (normally not enough to even notice, although 18" wheels on a 2.5i will definately be felt). On the other hand, a shorter sidewall can achieve better responsiveness (very tire dependent though).

But when it comes down to 99% of people, they aren't buying wheels for performance. If that were the case, 16 x 8" wheels with a stiff-sidewall tire would be the ticket on a non-STi. People buy them for looks.
good info... as I am a young apprentice of the art of the wheel & tire combo (performance wise), subscribe I must
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Old 12-24-2006, 02:12 PM   #20
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Quote:
Originally Posted by REX8 View Post
Weight and the location of that weight. Again, like you said, most daily drivers usually won't be able to tell, so it may only be relavent for competition purposes, but:

If you have a 16" wheel/tire combo that weighs the EXACT same as a 17" wheel/tire combo, the 17" wheel still takes more power to accelerate/stop than the 16" wheel.


Bingo. Reading through, I was justing waiting for someone to FINALLY say this. In addition is the wheel width. The wider the wheel, the more rotation mass. My preference is 17x8 with 245/40 tires. That's because I like less rotational mass, and more rubber for auto-x.
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Old 12-24-2006, 07:23 PM   #21
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thanks.. i'll try that method again tomorrow...
yep... that method gave me around 34lbs/wheel
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Old 12-24-2006, 07:26 PM   #22
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damn.......thats really light man...wt rims n tires r u running man
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Old 12-24-2006, 07:29 PM   #23
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Im running 18x8's and dont notice any performance difference over the stock 17's...but that's because the stockers arent all that light
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Old 12-24-2006, 07:36 PM   #24
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Quote:
Originally Posted by kwan_1104 View Post
damn.......thats really light man...wt rims n tires r u running man
technicrafts t6... forged aluminum. the guy sold it to me told me they are 11.5lbs each... wrapped with bridgestone s03.. actually the tires are like bald... around 2-3mm left... probably that shaved a bit weight as well... im going to wrap them with azenis when spring kicks in... im trying to do some research on tire weight lately to shave some unsprung weight...

actually i do feel a bit from the rev when i put them for 2 days... rev is a bit quicker with light weight wheels
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