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Your speed sensors and odometer sensors go off wheel rotation. When your overall diameter gets bigger you go further per rotation but your sensors don’t compensate for that. To them, one rotation is always going to be a set distance. So when you mess with that distance it will mess with the readings. Your speedometer will read low, so you’ll be going faster than your speedometer says you’re going and your odometer will think you’re going a shorter distance than you actually are. Your 225/45 is already messing with it a little bit, a 225/50 will be worse. You won’t have rubbing issues but it messes with other things. Unless you lower it in which case, you could have rubbing issues inside the wheel well since your tire is taller.
 

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Your speed sensors and odometer sensors go off wheel rotation. When your overall diameter gets bigger you go further per rotation but your sensors don’t compensate for that. To them, one rotation is always going to be a set distance. So when you mess with that distance it will mess with the readings. Your speedometer will read low, so you’ll be going faster than your speedometer says you’re going and your odometer will think you’re going a shorter distance than you actually are. Your 225/45 is already messing with it a little bit, a 225/50 will be worse. You won’t have rubbing issues but it messes with other things. Unless you lower it in which case, you could have rubbing issues inside the wheel well since your tire is taller.
Understood, thank you man! I didn't know it affected anything besides speedometer being a little off
 

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Your speed sensors and odometer sensors go off wheel rotation. When your overall diameter gets bigger you go further per rotation but your sensors don’t compensate for that. To them, one rotation is always going to be a set distance. So when you mess with that distance it will mess with the readings. Your speedometer will read low, so you’ll be going faster than your speedometer says you’re going and your odometer will think you’re going a shorter distance than you actually are. Your 225/45 is already messing with it a little bit, a 225/50 will be worse. You won’t have rubbing issues but it messes with other things. Unless you lower it in which case, you could have rubbing issues inside the wheel well since your tire is taller.
Understood, thank you man! I didn't know it affected anything besides speedometer being a little off
Additionally, a taller tire affects overall gearing for the car. It can help on the highway (lower revs/speed) but can make the car slower off the line.
No, it's not much of a change, but a change nonetheless.
 

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What is the biggest tire you can run on the front on the 03-06 tibs? Right now I am running 245/35/18 federal rsr-r on an 18x8 +40 offset rim on 5mm spacers. I have about a quarter inch if that from the coil over shock and the inside of the tire. I enjoy hastily driving through So Cal canyons and want to maximize my potential grip. Has anyone run a bigger size on stock fenders without cutting and getting flares? If so please list tire size and rim spec.
 

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Hi all,

I'm currently searching for a clean set of wheels to use during the summer on my '08 Tiburon GS. Although i learned a lot reading through this thread, I didn't find the exact information I'm searching for, since my model is not quite as popular as the GT one, so please forgive if this was answered earlier:

I'm running on stock suspension, and have no intent at the moment of lowering or anything, no rolled fenders or widebody kit.
Stock wheels: 205/55R16 16x6.5 +36 offset

I'm aiming for 18 inches, and was set on Enkei's EKM3 18x7.5 +38 on 215/40R18, which (correct me if i'm wrong) would fit, but i'm having some last minute doubts.

I'm looking at other models, and most of them are only available in 18x8/8.5 with offset of +40/+45. I'm afraid the wheel will be too close to the suspension if I not only increase the width, but also the offset (and they're quite substantial increases), and ideally I don't wan't to buy spacers if I can save myself the extra step.

My question: will 18x8.5 +45mm will rub on the inside/outside? (worst case scenario) Currently the most common values I saw was 18x8 +42mm

Thanks in advance!

Edit: If no one knows for sure, what's the best way I can verify this by myself before buying the set if any?
 

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Will 18x7.5 with a +40 offset with 225/40/18 allow me to keep a decent drop. Im on adjustable coilovers that allow a 1-3 inch drop from factory and was curious how much i would have to raise from where i am sitting now on stock 17s. Heres how low i am right now roughly
 

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I forgot to mention, the stock tires are 215/40/17
The new tires im may be getting are 225/40/18.
In my previous post i added a pic but im prrtty sure i raised and releveled it. Im guessing i have about a 1.5 inch drop all around roughly. I can drop up to 3 inches and im about in the middle of my threads on the coilovers. So would these 225/40/18s fit as it sits or will i have to raise it up 1/4-1/2 inch to clear the same as i do now on 215/40/17s?

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I forgot to mention, the stock tires are 215/40/17
The new tires im may be getting are 225/40/18.
In my previous post i added a pic but im prrtty sure i raised and releveled it. Im guessing i have about a 1.5 inch drop all around roughly. I can drop up to 3 inches and im about in the middle of my threads on the coilovers. So would these 225/40/18s fit as it sits or will i have to raise it up 1/4-1/2 inch to clear the same as i do now on 215/40/17s?

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Stock (on an 04) is 215/45-17......I would use an online "+1" calculator to compare the 17" to an 18".
Ideal is keep the same diameter/circumference of original so gearing, ground clearance and speedo/odo remain correct.

Next, how much do you load the car (more load, more chance to rub), what weather (snow does not really want a drop) and road conditions (speed bumps can be an issue as well as potholes).
 

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Ended up getting them and they went on without an issue, which is what i was worried about for the sake of an easy swap from car to car. But i will have to raise the front some because i get a pretty good rub on harsher bumps like when turning into a gas station off the main road, or under hard cornering.. Rears fit and clear so far with no issue, but have to get the fronts set so i can really test the rears in a corner, over bumps they seem to be good. Not bad for a straight up trade for my stock wheels i know that much haha.


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If you are trying to figure out how a set or rims and tires will fit in your wheel wells, here are some simple examples to help you decide which rim width and offset will look best. I've printed this out and hung it by my computer and as I shop for rims on eBay I can quickly see if a set or rims will be too wide for my fender opening.

My calculations are for 18" rims only, because that's what I intend to put on my Tib, but the diameter shouldn't matter so these should be valid for all diameters. I highly recommend the following link found by Solo2Tib BEST RIM SIZE/OFFSET CALCULATOR to also help you decide.

STOCK RIMS: 17" x 7" Offset 46mm
STOCK TIRES: 215/45-17
STOCK DISTANCE FROM HUB TO WHEEL RIM LIP: 1.7"
STOCK DISTANCE FROM THE HUB TO FENDER LIP: 2.7"

The stock rim/tire setup leaves slightly less than a 1" gap between the rim lip and the inside of the fender lip. So, using some basic math, you will figure out that the distance from the hub to the inside of the fender lip (drawing a perfectly vertical line) is about 2.7". Taking into account that the width of the tire wall is about 0.5".

The rims you choose have to have a "DISTANCE FROM HUB TO WHEEL RIM LIP" value of 2.2" or less. Anything more and you might get some rubbing during hard cornering (unless you have a widebody kit).

Rolling your fender lips (or cutting them off) will give you an additional 0.5" of clearance, meaning the distance from the hub to inside of the fender lip (drawing a perfectly vertical line) will be 2.7" or less.

18" x 7.5" Offset 45mm
215/40-18 (Suggested Tire size)
DISTANCE FROM HUB TO WHEEL RIM LIP: 1.95"

18" x 7.5" Offset 42mm (Most common size for Tibs)
215/40-18 (Suggested Tire size)
DISTANCE FROM HUB TO WHEEL RIM LIP: 2.05"

18" x 7.5" Offset 40mm
215/40-18 (Suggested Tire size)
DISTANCE FROM HUB TO WHEEL RIM LIP: 2.15"

18" x 7.5" Offset 30mm
215/40-18 (Suggested Tire size)
DISTANCE FROM HUB TO WHEEL RIM LIP: 2.35" Possible Rub

18" x 8" Offset 45mm
215/40-18 (Suggested Tire size)
DISTANCE FROM HUB TO WHEEL RIM LIP: 2.2"

18" x 8" Offset 40mm
215/40-18 (Suggested Tire size)
DISTANCE FROM HUB TO WHEEL RIM LIP: 2.4" Possible Rub

18" x 8" Offset 35mm
215/40-18 (Suggested Tire size)
DISTANCE FROM HUB TO WHEEL RIM LIP: 2.6" Rub, unless rolled fender

18" x 8.5" Offset 35mm
225/40-18 (Suggested Tire size)
DISTANCE FROM HUB TO WHEEL RIM LIP: 2.85" Rub, unless rolled fender

18" x 8.5" Offset 30mm
225/40-18 (Suggested Tire size)
DISTANCE FROM HUB TO WHEEL RIM LIP: 3.05" RUB

18" x 9" Offset 35mm
??? (Suggested Tire size)
DISTANCE FROM HUB TO WHEEL RIM LIP: 3.1" RUB

18" x 9" Offset 30mm
??? (Suggested Tire size)
DISTANCE FROM HUB TO WHEEL RIM LIP: 3.3" RUB

Hope this helps!

Also see Post #2 for the info created by STAW512
My current wheel specs are:

F/R: 17x8.25 XXR 527 (+24 offset) wrapped in 225/50R17 Falken Ziex ZE 950.

Rubs on medium sized bumps, road dips and full turns with the plastic linings removed at all 4 corners.

Our cars can handle a maximum upto 17x9.5 (+30 offset) & 18x9.5 (+30 offset). As well as 16" & 19", according to Fitment Industries website.
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My current wheel specs are:

F/R: 17x8.25 XXR 527 (+24 offset) wrapped in 225/50R17 Falken Ziex ZE 950.

Rubs on medium sized bumps, road dips and full turns with the plastic linings removed at all 4 corners.

Our cars can handle a maximum upto 17x9.5 (+30 offset) & 18x9.5 (+30 offset). As well as 16" & 19", according to Fitment Industries website.
Your aspect ratio is too high, you are messing up your speedometer and odometer and making your transmission work harder than it needs to. You should have 225/45/17
 

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Your aspect ratio is too high, you are messing up your speedometer and odometer and making your transmission work harder than it needs to. You should have 225/45/17
Don't you mean my offset is too low? But yea, I'm planning on getting a set of 5 - 17x9.5 JNC 005 (Gold +32 offset) with 225/45/17 Falken Ziex ZE950 rubbers with my unemployment check which $1,384 per week (gotta love Wisconsin). But first I have replace damn near every suspension part in the front of my GK Pre-F/L ('03) because everything broke going down the fucked up streets in Milwaukee. I'm gonna replace everything in the rear as a safe measure as well. Plus I just modified and test-fitted a widebody (knock-BRZ) body kit to the car successfully. Currently debating on getting a modified rear Impreza WRX STi wing or a KDM duck bill rear wing. Any ideas? I can upload a image on the weekend of it that I made in Gimp (Adobe costs way too much).
 

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Don't you mean my offset is too low? But yea, I'm planning on getting a set of 5 - 17x9.5 JNC 005 (Gold +32 offset) with 225/45/17 Falken Ziex ZE950 rubbers with my unemployment check which $1,384 per week (gotta love Wisconsin). But first I have replace damn near every suspension part in the front of my GK Pre-F/L ('03) because everything broke going down the fucked up streets in Milwaukee. I'm gonna replace everything in the rear as a safe measure as well. Plus I just modified and test-fitted a widebody (knock-BRZ) body kit to the car successfully. Currently debating on getting a modified rear Impreza WRX STi wing or a KDM duck bill rear wing. Any ideas? I can upload a image on the weekend of it that I made in Gimp (Adobe costs way too much).
No, offset is wheels. Aspect ratio is tires.
 
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