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Old 07-18-2005, 09:55 AM   #1
kevingk
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Default 245/45/17 for WRX

I would like to know if anyone has successfully mounted 245/45/17's (specifically Falken Azenis RT-615's) on STI wheels and installed them on a WRX Sedan with stock suspension. I have seen that some people roll the rear fenders when using Rotas (which have a different offset), but I would like to know if anyone has had interference on the strut side of the wheel, when using the STI wheels. Thanks in advance.
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Old 07-18-2005, 10:56 AM   #2
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I'm not sure if that was a typo or not, but you might want to go with 245/40/17's instead, since the size you listed is going to be taller than stock. Also the only sti wheels that fit the wrx are 04's and they are 7.5 inches wide which is a little narrow for that tire width.
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Old 07-18-2005, 11:04 AM   #3
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I just put 235/40-17's on my car and am REALLY diggin' the gearing difference a little smaller tire makes.

I would NOT go with a taller tire than the stock tire....the 245/40 would be a closer match to the stock size
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Old 07-18-2005, 11:05 AM   #4
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A guy in Milwaukee has 245/45/17 Hankook's on his '02 WRX. He also has a 6 speed so the taller sidewall isn't a problem.

I don't know the details. PM MustGoFast for answers on his setup.
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Old 07-18-2005, 11:30 AM   #5
kevingk
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No typo. My STI wheels are from a 2004, so they are 7.5" wide. Those Falkens are not available in a 245/40. The 245/45 will fit on a 7.5" wide rim. Generally, a tire that is wider than 225mm and with an aspect ratio of 40 or less requires an 8" wide rim. I would like to use the rims I have now and not upgrade to an 8" wide rim.

I think the extra contact patch area from a 245/45 (compared to a 225/45) will provide a larger benefit to performance than the increased gear ratios and extra weight.

fliz - Do you know if MustGoFast was using the 2004 STI wheels? Thanks again.
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Old 07-18-2005, 12:10 PM   #6
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Quote:
Originally Posted by kevingk
fliz - Do you know if MustGoFast was using the 2004 STI wheels? Thanks again.
He is not using STi wheels, although any wheel with the same offset will give you a good comparison.
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Old 07-18-2005, 12:25 PM   #7
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Quote:
Originally Posted by kevingk
No typo. My STI wheels are from a 2004, so they are 7.5" wide. Those Falkens are not available in a 245/40. The 245/45 will fit on a 7.5" wide rim. Generally, a tire that is wider than 225mm and with an aspect ratio of 40 or less requires an 8" wide rim. I would like to use the rims I have now and not upgrade to an 8" wide rim.

I think the extra contact patch area from a 245/45 (compared to a 225/45) will provide a larger benefit to performance than the increased gear ratios and extra weight.

fliz - Do you know if MustGoFast was using the 2004 STI wheels? Thanks again.

Those are the EXACT tires I'm going to replace my stockers with. I want a 245/45/17 to correct the speedo, slightly lengthen the gear ratios and provide a wider contact patch. My friend beat me to it by installing them on his EVO and the extra profile is nothing to worry about as far as being mushy- the 615s have some stiff ass sidewalls. If you have a 6 speed tranny I highly recommend it as the STi is plagued with terrible 1-4 gear ratios from the factory. Also, the 245/45/17 fits nicely on a 7.5" wheel.
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Old 07-18-2005, 01:45 PM   #8
kevingk
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Quote:
Originally Posted by Evil STI
Those are the EXACT tires I'm going to replace my stockers with. I want a 245/45/17 to correct the speedo, slightly lengthen the gear ratios and provide a wider contact patch. My friend beat me to it by installing them on his EVO and the extra profile is nothing to worry about as far as being mushy- the 615s have some stiff ass sidewalls. If you have a 6 speed tranny I highly recommend it as the STi is plagued with terrible 1-4 gear ratios from the factory. Also, the 245/45/17 fits nicely on a 7.5" wheel.
My friend also installed them on an EVO. I still have the stock WRX 5-speed transmission. There are a few auto-x clubs in my area that have very tight courses where I could stay in first for the entire course, except for a few sections where I currently bump off the rev-limiter for a short time. I think the taller tire would help me in that situation.

I checked on Discount Tire and they don't recommend the 245/45/17 for a 2004 WRX sedan, but they do recommend it for the 2004 STi. I just wanted to know if there was a difference in suspension geometry or hard points, that would stop the WRX sedan from accepting 245/45 tires on STi wheels.
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Old 07-22-2005, 01:43 PM   #9
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Bump.
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Old 07-22-2005, 10:16 PM   #10
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Quote:
Originally Posted by kevingk
No typo. My STI wheels are from a 2004, so they are 7.5" wide. Those Falkens are not available in a 245/40. The 245/45 will fit on a 7.5" wide rim. Generally, a tire that is wider than 225mm and with an aspect ratio of 40 or less requires an 8" wide rim. I would like to use the rims I have now and not upgrade to an 8" wide rim.

I think the extra contact patch area from a 245/45 (compared to a 225/45) will provide a larger benefit to performance than the increased gear ratios and extra weight.

fliz - Do you know if MustGoFast was using the 2004 STI wheels? Thanks again.

no.
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Old 07-22-2005, 11:27 PM   #11
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<--245/40/17 on 17 X 8.5 +50. dropped on eibach pros. no rubbing issues at all and never had to roll fenders.
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Old 07-23-2005, 10:06 AM   #12
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I am considering this too as soon as I burn through my stock 05 STi Rubber. I'd like 245/45 on my stock BBS rims.

From what I gather fitment is ok, but I'd like to confirm this before I do anything.
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Old 07-23-2005, 10:37 AM   #13
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Quote:
Originally Posted by swift2fly
<--245/40/17 on 17 X 8.5 +50. dropped on eibach pros. no rubbing issues at all and never had to roll fenders.
That's the +50 talking, which is a rare offset in an 8.5" wide wheel, usually they're +42 to +45, so you've got an extra 5-8mm on the outside to work with.
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Old 07-23-2005, 08:19 PM   #14
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Quote:
Originally Posted by Uncle Scotty
no.
Do you care to elaborate?

swift2fly - Thanks for the help.
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Old 07-23-2005, 08:27 PM   #15
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Quote:
Originally Posted by kevingk
Do you care to elaborate?

...no, not really....but tire size(and gearing change) and weight of the rotating assembly are FAR-FAR more important than a little bigger contact patch.....you are screwing yourself in the ass with a 245/45 unless you have at least 300whp, and even then.....you would be better off smaller/lighter.
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Old 07-23-2005, 10:37 PM   #16
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Oh it's not that bad Scotty, bad, but not that bad. Certainly -.3 is better than +.3 in any case, gearing and weight-wise.
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