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Old 04-28-2014, 03:23 PM   #1
A7x411
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Default can I replace a 215 tire with 235

I have an 04 sti and the tires I have now are 215/45/17 and I found some tires for cheap that are 235/45/17. Was wondering if I can buy those tires and if they will fit okay
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Old 04-28-2014, 03:25 PM   #2
HinshawWRX
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Stock wheels?
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Old 04-28-2014, 03:27 PM   #3
A7x411
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No it has rotas on now. They were on the car when I bought it. Not sure of offset but the wheels are tucked in the wheel well a good amount.
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Old 04-28-2014, 03:28 PM   #4
HinshawWRX
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So then what size are those? We can't tell you a 235 will fit without knowing width of wheel.
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Old 04-28-2014, 03:36 PM   #5
A7x411
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Idk of the size I have to take a wheel off and find it on the wheel but I have now and always have had 215/45/17 tires and my speedometer does read about 5mph high if that helps
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Old 04-28-2014, 04:04 PM   #6
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Quote:
Originally Posted by HinshawWRX View Post
So then what size are those? We can't tell you a 235 will fit without knowing width of wheel.
This. It would be nice to know the offset of your Rotas OP. You need to make sure the sidewall of the tire won't come in contact with the strut. I'm running a 225 instead of 235 for that exact reason.
-Art
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Old 04-28-2014, 04:12 PM   #7
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Originally Posted by A7x411 View Post
Idk of the size I have to take a wheel off and find it on the wheel but I have now and always have had 215/45/17 tires and my speedometer does read about 5mph high if that helps
Then we can't help you until you figure out the width. And tire width shouldn't throw off speedo.
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Old 04-28-2014, 06:04 PM   #8
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Quote:
And tire width shouldn't throw off speedo.
Seeing the /45 on both tires indicated the sidewall hight of a tyre as a percentage of the width the 235 tyres DO mess with the speedo.
A 235/45 tyre has a larger circumference then a 215/45.
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Old 04-29-2014, 12:35 AM   #9
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i believe that the original size for the sti tire was 235/45 and they put 225/45's on the usdm models, for whatever reason, without making any other changes(other than springs, which sucked )

and me and another subaru d0000d...one of the 3 number moderators and a subaru parts dept d000d...figured out that the difference in the speedo and odo was exactly this difference when measured, repeatedly, with gps on several cars

unless the offset is way different, the 235/45 should fit just like stock

because it WAS...everywhere but the usdm
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Old 04-29-2014, 05:55 AM   #10
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On a EUDM STI the standard fitment was 225/45/17
So your statement is factually wrong.

Also, the OP is not running the stock wheels , nor the stock 225 tyre.
So even if the 235 he wants physically fit the car they might not fit his wheels, or the non-OEM wheels cause troubles because of offset.
Furthermore he is running 215/45 now, so going up to 235/45 WILL give a speedometer error, almost the same he has now, but reversed, so instead of reading 5 mph high you'll read about 5 mph low

Last edited by Dutch Scooby lover; 04-29-2014 at 06:22 AM.
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Old 04-30-2014, 03:38 AM   #11
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Quote:
Originally Posted by Dutch Scooby lover View Post
On a EUDM STI the standard fitment was 225/45/17
So your statement is factually wrong.

Also, the OP is not running the stock wheels , nor the stock 225 tyre.
So even if the 235 he wants physically fit the car they might not fit his wheels, or the non-OEM wheels cause troubles because of offset.
Furthermore he is running 215/45 now, so going up to 235/45 WILL give a speedometer error, almost the same he has now, but reversed, so instead of reading 5 mph high you'll read about 5 mph low

i dont know about eudm...but id BET YOU MONEY that the speedometer and odometer were calibrated for 235/45 tires

in fact..subaru got in trouble for that after the fact....but me and my buddy bill figured it out WAY before anybody else did

this IS fact....and id also bet $100 that if YOU the OP puts 235/45 tires on the car with the stock wheel size....gps will verify that the speedometer and odometer will be spot ON.
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Old 05-03-2014, 02:06 PM   #12
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Spot on Scotty. With 225/45/17 on my 06 Sti the speedometer reads high. I'm currently running 245/40/18 and the speedometer matches gps speed.
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